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  • 1.
    Alcusa-Saez, E. P.
    et al.
    University of Valencia, Spain.
    Diez, A.
    University of Valencia, Spain.
    Rivera-Perez, E.
    University of Valencia, Spain.
    Margulis, Walter
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Norin, Lars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Andres, M. V.
    University of Valencia, Spain.
    All-fiber acousto-optic tunable filter in polyimide coated optical fibers2017Inngår i: International Conference on Transparent Optical Networks, 2017Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We present the experimental demonstration of in-fiber acousto-optic coupling in a polyimide-coated optical fiber. Although the presence of the polyimide coating increases is significantly the attenuation of the acoustic wave, we show that acousto-optic interaction can still be produced with reasonable efficiency. The effect of the polyimide coating on the acousto-optic interaction process is analyzed in detailed. Theoretical and experimental results are in good agreement. To our knowledge, this is the first experimental demonstration of acousto-optic coupling in optical fibers with robust protective coating.

  • 2.
    Alcusa-Sáez, E. P.
    et al.
    ICMUV Departamento de Física Aplicada y Electromagnetismo, Spain.
    Díez, Antonio
    ICMUV Departamento de Física Aplicada y Electromagnetismo, Spain.
    Rivera-Pérez, E.
    ICMUV Departamento de Física Aplicada y Electromagnetismo, Spain.
    Margulis, Walter
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Norin, L.
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Andrés, M. V.
    ICMUV Departamento de Física Aplicada y Electromagnetismo, Spain.
    Acousto-optic interaction in polyimide coated optical fibers with flexural waves2017Inngår i: Optics Express, E-ISSN 1094-4087, Vol. 25, nr 15, s. 17167-17173Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Acousto-optic coupling in polyimide-coated single-mode optical fibers using flexural elastic waves is demonstrated. The effect of the polyimide coating on the acousto-optic interaction process is analyzed in detailed. Theoretical and experimental results are in good agreement. Although the elastic attenuation is significant, we show that acousto-optic coupling can be produced with a reasonably good efficiency. To our knowledge, it is the first experimental demonstration of acousto-optic coupling in optical fibers with robust protective coating.

  • 3.
    Amorebieta, Josu
    et al.
    University of the Basque Country, Spain.
    Pereira, Joao
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Durana, Gaizka
    University of the Basque Country, Spain.
    Franciscangelis, Carolina
    RISE Research Institutes of Sweden.
    Ortega-Gomez, Angel
    University of the Basque Country, Spain.
    Zubia, Joseba
    University of the Basque Country, Spain.
    Villatoro, Joel
    University of the Basque Country, Spain; Ikerbasque-Basque Foundation for Science, Spain.
    Margulis, Walter
    RISE Research Institutes of Sweden.
    Twin-core fiber sensor integrated in laser cavity2022Inngår i: Scientific Reports, E-ISSN 2045-2322, Vol. 12, nr 1, artikkel-id 11797Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this work, we report on a twin-core fiber sensor system that provides improved spectral efficiency, allows for multiplexing and gives low level of crosstalk. Pieces of the referred strongly coupled multicore fiber are used as sensors in a laser cavity incorporating a pulsed semiconductor optical amplifier (SOA). Each sensor has its unique cavity length and can be addressed individually by electrically matching the periodic gating of the SOA to the sensor’s cavity roundtrip time. The interrogator acts as a laser and provides a narrow spectrum with high signal-to-noise ratio. Furthermore, it allows distinguishing the response of individual sensors even in the case of overlapping spectra. Potentially, the number of interrogated sensors can be increased significantly, which is an appealing feature for multipoint sensing. © 2022, The Author(s).

  • 4.
    Amorebieta, Josu
    et al.
    University of the Basque Country, Spain.
    Pereira, Joao
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Franciscangelis, Carolina
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Durana, Gaizka
    University of the Basque Country, Spain.
    Zubia, Joseba
    University of the Basque Country, Spain.
    Villatoro, Joel
    University of the Basque Country, Spain.
    Margulis, Walter
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Carbon-coated fiber for optoelectronic strain and vibration sensing2024Inngår i: Optical fiber technology (Print), ISSN 1068-5200, E-ISSN 1095-9912, Vol. 85, artikkel-id 103794Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this article, we report on a carbon-coated optical fiber that is suitable to be used simultaneously as a transmission medium and as a sensor. It consists of a standard single mode fiber (SMF) sleeved in two layers of coating, which provide protection and isolation from external elements. The inner layer is made of carbon, whereas the outer is made of polymer. When the fiber is subjected to mechanical stress, the electrical resistance of the carbon layer changes accordingly. The voltage variations caused by the former can be measured with high accuracy and without interfering with the light propagating through the SMF. In this work, the feasibility of this operating principle is demonstrated in a low coherence Michelson interferometer in which electrical and optical signals were measured simultaneously and compared to each other. Results indicate that electrical measurements are as precise as the optical ones and with linear behavior, reaching a sensitivity of 1.582 mV/με and able to detect vibrations down to 100 mHz. © 2024 The Authors

    Fulltekst (pdf)
    fulltext
  • 5.
    Araujo, Leonardo F.
    et al.
    Pontifical Catholic University of Rio de Janeiro, Brazil.
    Etcheverry, Sebastián
    RISE., Swedish ICT, Acreo.
    da Costa, Greice Kelly Bezerra
    Federal Rural University of Rio de Janeiro, Brazil.
    Pereira, Joao
    Pontifical Catholic University of Rio de Janeiro, Brazil.
    Camara, Alexandre R.
    Rio de Janeiro State University, Brazil.
    de Matos, Christiano José Santiago
    Mackenzie Presbyterian University, Brazil.
    Margulis, Walter
    RISE., Swedish ICT, Acreo.
    Fontana, Jake
    United States Naval Research Laboratory, US.
    Carvalho, Isabel C. S.
    Pontifical Catholic University of Rio de Janeiro, Brazil.
    Photonics with special optical fibers and nanoparticles2016Inngår i: Optics InfoBase Conference Papers, 2016, artikkel-id LW3A.1Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Optical properties of nanorods in the presence of external electric field when confined to a special optical fiber was investigated, showing an increase of the longitudinal absorption peak in the presence of the field.

  • 6.
    Camara, Alexandre R.
    et al.
    Rio de Janeiro State University, Brazil; Pontifical Catholic University of Rio de Janeiro, Brazil.
    Pereira, Joao
    Pontifical Catholic University of Rio de Janeiro, Brazil.
    Tarasenko, Oleksandr
    RISE., Swedish ICT, Acreo, Fiber Optics.
    Margulis, Walter
    RISE., Swedish ICT, Acreo, Fiber Optics. KTH Royal Institute of Technology, Sweden.
    Carvalho, Isabel C. S.
    Pontifical Catholic University of Rio de Janeiro, Brazil.
    Optical creation and erasure of the linear electrooptical effect in silica fiber2015Inngår i: Optics Express, E-ISSN 1094-4087, Vol. 23, nr 14, s. 18060-18069Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We study the creation and erasure of the linear electrooptical effect in silicate fibers by optical poling. Carriers are released by exposure to green light and displaced with simultaneous application of an internal dc field. The second order nonlinear coefficient induced grows with poling bias. The field recorded (~108 V/m) is comparable to that obtained through classical thermal poling of fibers. In the regime studied here, the second-order nonlinearity induced (~0.06 pm/V) is limited by the field applied during poling (1.2 × 108 V/m). Optical erasure with high-power green light alone is very efficient. The dynamics of the writing and erasing process is discussed, and the two dimensional (2D) field distribution across the fiber is simulated.

  • 7. Candiani, A
    et al.
    Margulis, Walter
    RISE., Swedish ICT, Acreo.
    Sterner, Carola
    RISE., Swedish ICT, Acreo.
    Konstantaki, M
    Pissadakis, S
    Phase-shifted Bragg microstuctured optical fibre grating utilizing infiltrated ferrofluidics2011Inngår i: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 36, nr 13, s. 2548-50Artikkel i tidsskrift (Fagfellevurdert)
  • 8.
    Candiani, Alessandro
    et al.
    University of Parma, Italy.
    Giannetti, Sara
    University of Parma, Italy.
    Sozzi, Michele
    University of Parma, Italy.
    Coscelli, Enrico
    University of Parma, Italy.
    Poli, Federica
    University of Parma, Italy.
    Cucinotta, Annamaria
    University of Parma, Italy.
    Bertucci, Alessandro
    University of Parma, Italy.
    Corradini, Roberto
    University of Parma, Italy.
    Konstantaki, Maria
    Foundation for Research and Technology, Greece.
    Margulis, Walter
    RISE., Swedish ICT, Acreo.
    Pissadakis, Stavros
    Foundation for Research and Technology, Greece.
    Selleri, Stefano
    University of Parma, Italy.
    Microstructured optical fiber Bragg grating sensor for DNA detection2013Inngår i: Progress in Biomedical Optics and Imaging - Proceedings of SPIE, 2013, Vol. 8576, artikkel-id 85760EKonferansepaper (Fagfellevurdert)
    Abstract [en]

    In this work the inner surface of a microstructured optical fiber, where a Bragg grating was previously inscribed, has been functionalized using peptide nucleic acid probe targeting a DNA sequence of the cystic fibrosis disease. The solution of DNA molecules, matched with the PNA probes, has been infiltrated inside the fiber capillaries and hybridization has been realized according to the Watson - Crick Model. In order to achieve signal amplification, oligonucleotide-functionalized gold nanoparticles were then infiltrated and used to form a sandwich-like system. Experimental measurements show a clear wavelength shift of the reflected high order mode for a 100 nM DNA solution. Several experiments have been carried out on the same fiber using the identical concentration, showing the same modulation and proving a good reproducibility of the results, suggesting the possibility of the reuse of the sensor. Measurements have been also made using a 100 nM mis-matched DNA solution, containing a single nucleotide polymorphism, demonstrating the high selectivity of the sensor.

  • 9.
    Candiani, Alessandro
    et al.
    Foundation for Research and Technology-Hellas, Greece; University of Parma, Italy.
    Konstantaki, Maria
    Foundation for Research and Technology-Hellas, Greece.
    Margulis, Walter
    RISE., Swedish ICT, Acreo.
    Pissadakis, Stavros
    Foundation for Research and Technology-Hellas, Greece.
    A shear-displacement sensor based on a ferrofluidic defected microstructured optical fibre bragg grating2013Inngår i: Bragg Gratings, Photosensitivity, and Poling in Glass Waveguides, BGPP 2012, 2013Konferansepaper (Fagfellevurdert)
    Abstract [en]

    A shear sensor based on a ferrofluid infiltrated microstructured optical fiber Bragg grating is presented. Shear displacements between 250μm and 4.5mm are measured, corresponding to spectral changes in the reflected spectra greater than 5dB.

  • 10.
    Candiani, Allessandro
    et al.
    University of Parma, Italy.
    Giannetti, Sara
    University of Parma, Italy.
    Cucinotta, Annamaria
    University of Parma, Italy.
    Bertucci, Alessandro
    University of Parma, Italy.
    Manicardi, Alex
    University of Parma, Italy.
    Konstantaki, Maria
    Foundation for Research and Technology, Greece.
    Margulis, Walter
    RISE., Swedish ICT, Acreo.
    Pissadakis, Stavros
    Foundation for Research and Technology, Greece.
    Corradini, Roberto
    University of Parma, Italy.
    Selleri, Stafano
    University of Parma, Italy.
    DNA biosensors implemented on PNA-functionalized microstructured optical fibers Bragg gratings2013Inngår i: Proceedings of SPIE - The International Society for Optical Engineering, 2013, artikkel-id 877502Konferansepaper (Fagfellevurdert)
    Abstract [en]

    A novel DNA sensing platform based on a Peptide Nucleic Acid-functionalized Microstructured Optical Fibers gratings has been demonstrated. The inner surface of different MOFs has been functionalized using PNA probes, OligoNucleotides mimic that are well suited for specific DNA target sequences detection. The hybrid sensing systems were tested for optical DNA detection of targets of relevance in biomedical application, using the cystic fibrosis gene mutation, and food-analysis, using the genomic DNA from genetic modified organism soy flour. After the solutions of DNA molecules has been infiltrated inside the fibers capillaries and hybridization has occurred, oligonucleotidefunctionalized gold nanoparticles were infiltrated and used to form a sandwich-like system to achieve signal amplification. Spectral measurements of the reflected signal reveal a clear wavelength shift of the reflected modes when the infiltrated complementary DNA matches with the PNA probes placed on the inner fiber surface. Measurements have also been made using the mismatched DNA solution for the c, containing a single nucleotide polymorphism, showing no significant changes in the reflected spectrum. Several experiments have been carried out demonstrating the reproducibility of the results and the high selectivity of the sensors, showing the simplicity and the potential of this approach.

  • 11.
    Carvalho, ICS
    et al.
    RISE., Swedish ICT, Acreo.
    Lesche, B
    RISE., Swedish ICT, Acreo.
    Margulis, Walter
    RISE., Swedish ICT, Acreo.
    Second order nonlinearities in optical fibers2002Inngår i: Polymer Optical Fibers / [ed] Nalwa, H., Los Angeles, CA, USA: American Scientific Publishers, 2002Kapittel i bok, del av antologi (Annet vitenskapelig)
  • 12.
    Carvalho, Isabel C. S.
    et al.
    Pontifical Catholic University of Rio de Janeiro, Brazil.
    Tarasenko, Oleksander
    RISE., Swedish ICT, Acreo.
    Camara, Alexandre R.
    Rio de Janeiro State University, Brazil.
    Pereira, Joao
    Pontifical Catholic University of Rio de Janeiro, Brazil.
    Margulis, Walter
    RISE., Swedish ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Pockels fibers by optical poling2015Inngår i: Workshop on Specialty Optical Fibers and their Applications 2015, 2015, artikkel-id WT4A.22Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Silica fibers with internal electrodes biased with HV are poled when simultaneously excited by green light. The x(2) induced measured through the Pockels effect at 1.55 μm reaches ~0.11 pm/V. Poling and erasure are studied.

  • 13.
    Claesson, Åsa
    et al.
    RISE., Swedish ICT, Acreo.
    Smuk, S.
    Arsalane, H.
    Margulis, Walter
    Naterstad, T.
    Zimmer, E.
    Malthe-Sørenssen, A.
    Internal Electrode Fiber Polarization Controller2003Inngår i: Conf Opt Fiber Commun Tech Dig Ser, 2003, s. 39-40Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Potentially low-cost polarization controllers were studied with a current-driven internal electrode fibers. The return loss was determined for the device. An EDFA was used as light source, and five devices were constructed and tested. The polarization dependent loss (PDL) of the polarization controllers was measured between 1530 nm and 1570 nm using the Jones-matrix method. The response times for the controllers was found to be relatively slow. The rise time of the optical response was significantly improved by overshooting the current pulse.

  • 14.
    Colaço, Marcos
    et al.
    Rio de Janeiro State University, Brazil.
    Camara, Alexandre
    Rio de Janeiro State University, Brazil.
    Nogueira, Liebert
    University of Oslo, Norway.
    Carvalho, Isabel
    Pontifícia Universidade Católica Do Rio de Janeiro, Brazil.
    Margulis, Walter
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara. KTH Royal Institute of Technologt, Sweden.
    Barroso, Regina
    Rio de Janeiro State University, Brazil.
    Characterization of the microstructures of specialty optical fibers for electric-field sensing by propagation-based x-ray phase-contrast microtomography2021Inngår i: Measurement science and technology, ISSN 0957-0233, E-ISSN 1361-6501, Vol. 32, nr 6, artikkel-id 065401Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this work, we present a quantitative (statistical) 3D morphological characterization of optical fibers used in electric-field sensing. The characterization technique employs propagation-based x-ray phase-contrast microcomputed tomography (micro-CT). In particular, we investigate specialty optical fibers that contain microstructured holes that are electro-optically modified by thermal poling to induce second-order nonlinear effects (SONE). The efficiency of the SONE is reflected in the characterization parameter, Vπ, which is highly dependent on the dimensions of the fiber. The fiber microstructures must be uniform to support the fabrication of reproducible devices. The results obtained using the micro-CT technique show that uncertainty of ±1.7% arises in the determination of the expected value of the voltage that causes a change in the phase of the electromagnetic wave equal to π rad (Vπ ), demonstrating a great advantage, compared with other techniques e.g. SEM, which would need at least 1000 images of the cross-section of an optical fiber, taken at different points, making the process more expensive and time-consuming.

  • 15.
    de Oliveira, Rafael
    et al.
    RISE., Swedish ICT, Acreo. Mackenzie Presbyterian University, Brazil.
    Sjödin, Niclas
    RISE., Swedish ICT, Acreo.
    Fokine, Michael
    KTH Royal Institute of Technology, Sweden.
    Margulis, Walter
    RISE., Swedish ICT, Acreo.
    de Matos, Christiano
    Mackenzie Presbyterian University, Brazil.
    Norin, Lars
    RISE., Swedish ICT, Acreo.
    Fabrication Optical Characterization of Silica Optical Fibers Containing Gold Nanoparticles2014Inngår i: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 7, nr 1, s. 370-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Gold nanoparticles have been used since antiquity for the production of red-colored glasses. More recently, it was determined that this color is caused by plasmon resonance, which additionally increases the material's nonlinear optical response, allowing for the improvement of numerous optical devices. Interest in silica fibers containing gold nanoparticles has increased recently, aiming at the integration of nonlinear devices with conventional optical fibers. However, fabrication is challenging due to the high temperatures required for silica processing and fibers with gold nanoparticles were solely demonstrated using sol-gel techniques. We show a new fabrication technique based on standard preform/fiber fabrication methods, where nanoparticles are nucleated by heat in a furnace or by laser exposure with unprecedented control over particle size, concentration, and distribution. Plasmon absorption peaks exceeding 800 dB m-1 at 514-536 nm wavelengths were observed, indicating higher achievable nanoparticle concentrations than previously reported. The measured resonant nonlinear refractive index, (6.75 ± 0.55) × 10-15 m2 W-1, represents an improvement of >50×.

  • 16.
    Del Rosso, Tommaso
    et al.
    Pontifícia Universidade Católica do Rio de Janeiro, Brazil.
    Margulis, Walter
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Fontana, Jake
    Naval Research Laboratory, US.
    Carvalho, Isabel C.S.
    Pontifícia Universidade Católica do Rio de Janeiro, Brazil.
    10 - Plasmonics for the Characterization of Metal Organic Films and Nanoparticles2019Inngår i: Metal Nanostructures for Photonics, Elsevier , 2019, s. 223-259Kapittel i bok, del av antologi (Annet vitenskapelig)
    Abstract [en]

    Here, we present an overview of the ellipsometric characterization of hybrid thin films and metal nanoparticles by surface plasmon resonance (SPR) spectroscopy, together with the dynamic control of the optical properties of the latter for applications in optoelectronic devices. A description of traditional techniques used for the determination of the thickness and refractive index of organic thin films deposited over the SPR planar sensing platforms is presented, with a discussion of the most recent applications in the ellipsometric characterization of thin film of metal nanoparticles and graphene layers. We conclude by describing recent results developing a dynamically tunable plasmonic pixel, where the electric-field-controlled alignment of gold nanorods in a colloidal suspension can enable optical switching at frequencies greater than megahertz.

  • 17. Demenicis, L
    et al.
    Lima, R
    Conrado, LF
    Carvalho, MC
    Margulis, Walter
    RISE., Swedish ICT, Acreo.
    Large Transformation-Ratio Multilayered Planar Transmission Line Transformers Using High-Dielectric-Constant Thin Film2009Inngår i: Journal of Microwaves Optoelectronics Electromagnetic Applications, Vol. 8, nr 2Artikkel i tidsskrift (Fagfellevurdert)
  • 18. Dierolf, V.
    et al.
    Morgus, T.
    Fleischman, Z.
    Sandmann, Chr.
    Claesson, Åsa
    RISE., Swedish ICT, Acreo.
    Margulis, Walter
    RISE., Swedish ICT, Acreo.
    Characterization of highly erbium-doped fibers using confocal luminescence microscopy2004Inngår i: OSA Trends Opt. Photonics Series, Optical Society of American (OSA) , 2004, s. 539-541Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Using confocal luminescence microscopy and detailed evaluation of the luminescence spectra in terms of intensity, spectral position and width, we determined the erbium doping profiles and their inhomogeneities in high index profile singly mode fibers. 

  • 19.
    Estcheverry, Sebastián
    et al.
    RISE., Swedish ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Sudirman, Aziza
    Cobolt AB, Sweden.
    Laurell, Frederik
    KTH Royal Institute of Technology, Sweden.
    Margulis, Walter
    RISE., Swedish ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Playing cellular Golf in microstructured fibres2015Inngår i: Workshop on Specialty Optical Fibers and their Applications 2015, 2015, artikkel-id WF1A.1Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We illuminate particles in a solution using fibers with cladding holes. Particles sufficiently near the fiber tip and with the correct optical signature are collected into the holes with good specificity, mimicking cell-collection for diagnostics.

  • 20.
    Etcheverry, S.
    et al.
    KTH Royal Institute of Technology, Sweden.
    Faridi, A.
    KTH Royal Institute of Technology, Sweden.
    Ramachandraiah, H.
    KTH Royal Institute of Technology, Sweden.
    Margulis, Walter
    RISE., Swedish ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Laurell, F.
    KTH Royal Institute of Technology, Sweden.
    Russom, A.
    RISE., Swedish ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Optofludics in microstructured fibers combining particle elasto-inertial focusing and fluorescence2016Inngår i: 2016 Conference on Lasers and Electro-Optics (CLEO), 2016, artikkel-id 7789265Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Optofluidics is exploited in an all-fiber component to detect and identify through fluorescence particles flowing at high rate and inertially focused in a capillary. The system represents a first step towards an in-fiber flow cytometer.

  • 21.
    Etcheverry, Sebastian
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Araujo, Leonardo F.
    PUC-RIO Pontifícia Universidade Católica do Rio de Janeiro, Brazil.
    Carvalho, Isabel C. S.
    PUC-RIO Pontifícia Universidade Católica do Rio de Janeiro, Brazil.
    Margulis, Walter
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Fontana, Jake
    Naval Research Laboratory, USA.
    Digital electric field induced switching of plasmonic nanorods using an electro-optic fluid fiber2017Inngår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 111, nr 22, artikkel-id 221108Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We demonstrate the digital electric field induced switching of plasmonic nanorods between "1" and "0" orthogonal aligned states using an electro-optic fluid fiber component. We show by digitally switching the nanorods that thermal rotational diffusion of the nanorods can be circumvented, demonstrating an approach to achieve submicrosecond switching times. We also show, from an initial unaligned state, that the nanorods can be aligned into the applied electric field direction in 110 ns. The high-speed digital switching of plasmonic nanorods integrated into an all-fiber optical component may provide opportunities for remote sensing and signaling applications. © 2017 Author(s).

  • 22.
    Etcheverry, Sebastian
    et al.
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Araujo, Leonardo F.
    Pontifical Catholic University of Rio de Janeiro, Brazil.
    da Costa, Greice K. B.
    Rural Federal University of Rio de Janeiro, Brazil.
    Pereira, Joao
    Pontifical Catholic University of Rio de Janeiro, Brazil.
    Camara, Alexandre R.
    Rio de Janeiro State University, Brazil.
    Naciri, Jawad
    Naval Research Laboratory, USA.
    Ratna, Banahalli R.
    Naval Research Laboratory, USA.
    Hernández-Romano, Ivan
    University of Guanajuato, Mexico; Mackenzie Presbyterian University, Brazil.
    de Matos, Cristiano J. S.
    Mackenzie Presbyterian University, Brazil.
    Carvalho, Isabel C. S.
    Pontifical Catholic University of Rio de Janeiro, Brazil.
    Margulis, Walter
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Fontana, Jake
    Naval Research Laboratory, USA.
    Microsecond switching of plasmonic nanorods in an all-fiber optofluidic component2017Inngår i: Optica, E-ISSN 2334-2536, Vol. 4, nr 8, s. 864-870Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    As information technologies move from electron- to photon-based systems, the need to rapidly modulate light is of paramount importance. Here, we study the evolution of the electric-field-induced alignment of gold nanorods suspended in organic solvents. The experiments were performed using an all-fiber optofluidic device, which enables convenient interaction of light, electric fields, and the nanorod suspension. We demonstrate microsecond nanorod switching times, three orders of magnitude faster than a traditional Freederickcz-based liquid crystal alignment mechanism. We find that the dynamics of the alignment agrees well with the Einstein–Smoluchowski relationship, allowing for the determination of the rotational diffusion coefficient and polarizability anisotropy of the nanorods as well as the effective length of the ligands capping the nanorods. The ability to dynamically control the optical properties of these plasmonic suspensions coupled with the point-to-point delivery of light from the fiber component, as demonstrated in this work, may enable novel ultrafast optical switches, filters, displays, and spatial light modulators.

  • 23.
    Etcheverry, Sebastian
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Russom, A.
    KTH Royal Institute of Technology, Sweden.
    Laurell, F.
    KTH Royal Institute of Technology, Sweden.
    Margulis, Walter
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Trapping and optical identification of microparticles in a liquid with a functional optical fiber probe2018Inngår i: Conference on Lasers and Electro-Optics OSA Technical Digest (online) (Optical Society of America, 2018), paper AM4P.6, 2018Konferansepaper (Fagfellevurdert)
    Abstract [en]

    A fiber probe traps single micrometer-particles by fluid suction into a hollow microstructure and enables optical identification by the fluorescence light collected in a fiber core. The probe finds applications in life-science and environmental monitoring.

  • 24.
    Etcheverry, Sebastian
    et al.
    RISE., Swedish ICT, Acreo, Fiber Optics. KTH Royal Institute of Technology, Sweden.
    Sudirman, Aziza
    RISE., Swedish ICT, Acreo, Fiber Optics. KTH Royal Institute of Technology, Sweden.
    Margulis, Walter
    RISE., Swedish ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Laurell, Fredrik
    KTH Royal Institute of Technology, Sweden.
    Identification and collection of particles with optical fibers2015Inngår i: Novel Biophotonics Techniques and Applications III / [ed] Arjen Amelink, I. Alex Vitkin, 2015, Vol. 9540, artikkel-id 95400NKonferansepaper (Fagfellevurdert)
    Abstract [en]

    A micro-structured fiber-based system for identification and collection of fluorescent particles is demonstrated. An optical fiber probe with longitudinal holes in the cladding is used to retrieve fluorescent particles by exerting microfluidics forces. Laser induced fluorescent (LIF) is carried out by the fiber probe and an optical setup. When a particle with a previously chosen fluorescence wavelength is identified, a vacuum pump is activated collecting the particle into a hole. Green and red fluorescent polystyrene particles were detected and selectively retrieved.

  • 25.
    Etcheverry, Sebastián
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Araujo, Leonardo
    Universidade Federal de Pernambuco, Brazil.
    Carvalho, Isabel
    Universidade Federal de Pernambuco, Brazil.
    Margulis, Walter
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Fontana, Jake
    Naval Research Laboratory, USA.
    Sub-microsecond switching times using dynamically tunable plasmonic pixels2018Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Liquid crystal based devices can arbitrarily control the amplitude, phase and polarization of light, enabling disruptive technologies such as flat screen televisions and smart phones. Yet, the Achilles heel of these devices are their slow, millisecond switching speeds, constraining potential applications. Here we develop the concept of a dynamic plasmonic pixel as a novel paradigm for liquid crystal devices using the electric field controlled alignment of gold nanorods. Experiments were performed using an electro-optic fluid fiber device, which enabled convenient interaction of light, electric fields and the nanorod suspension. We studied the evolution of the electric-field induced alignment of gold nanorods and demonstrate microsecond switching times, 3 orders of magnitude faster than a traditional Freederickcz-based liquid crystal alignment mechanism. We find that the dynamics of the alignment agrees well with the Einstein-Smoluchowski relationship. Furthermore, by digitally switching the nanorods between orthogonally aligned states, we show switching frequencies greater than MHz can be achieved. The development of these dynamically tunable plasmonic pixels may lead to ultrafast optical switches, filters, displays and spatial light modulators.

  • 26.
    Etcheverry, Sebastián
    et al.
    RISE., Swedish ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Faridi, Muhammad Asim
    KTH Royal Institute of Technology, Sweden.
    Ramachandraiah, Harisha
    KTH Royal Institute of Technology, Sweden.
    Margulis, Walter
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Laurell, Fredrik
    KTH Royal Institute of Technology, Sweden.
    Russom, Aman
    KTH Royal Institute of Technology, Sweden.
    All fiber based micro-flow cytometer by combining optical fiber with inertial focusing2016Inngår i: 20th International Conference on Miniaturized Systems for Chemistry and Life Sciences (MicroTAS 2016), 2016, Vol. 3, s. 1655-1656Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Towards a portable point of care flow cytometry platform, we present here an integrated all optical fiber-based optofluidic system capable of counting and discriminating fluorescent particles and cells. The robust and compact device incorporates optical fibers and circular capillaries to build an all-fiber optofluidic device to enable counting particles based on their fluorescent and back-scatter light emission. Here, we combine this with inertial- and elasto-inertial microfluidics for sheathless particle and cell focusing for integrated detection with scattering and fluorescence detections - all necessary components of standard cytometers. We validated the system for cell counting based on scattering and fluorescence.

  • 27.
    Fanjoux, Gil
    et al.
    CNRS Universite de Franche-Comte, France.
    Beugnot, Jean Charles
    CNRS Universite de Franche-Comte, France.
    Sudirman, Aziza
    RISE., Swedish ICT, Acreo.
    Furfaro, Luca
    CNRS Universite de Franche-Comte, France.
    Margulis, Walter
    RISE., Swedish ICT, Acreo.
    Sylvestre, Thibaut
    CNRS Universite de Franche-Comte, France.
    Stimulated Raman-Kerr scattering in an integrated nonlinear optofluidic fiber arrangement2014Inngår i: Bragg Gratings, Photosensitivity, and Poling in Glass Waveguides, BGPP 2014, Optical Society of America (OSA) , 2014Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We report in an original nonlinear optofluidic fiber arrangement the observation of an octave-spanning Raman cascade that subsequently broadens towards supercontinuum generation due to the stimulated Raman-Kerr scattering. © 2014 Optical Society of America.

  • 28.
    Fanjoux, Gil
    et al.
    FEMTO-ST Institute, France.
    Sudirman, Aziza
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Beugnot, Jean-Charles
    FEMTO-ST Institute, France.
    Furfaro, Luca
    FEMTO-ST Institute, France.
    Margulis, Walter
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Sylvestre, Thibaut
    FEMTO-ST Institute, France.
    Towards supercontinuum generation by stimulated Raman-Kerr scattering in an integrated nonlinear liquid core fiber2015Inngår i: The European Conference on Lasers and Electro-Optics 2015, Optical Society of America (OSA) , 2015, artikkel-id CD_6_3Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Integrated liquid-core optical fibers (LCOF) have recently emerged as new photonic platforms for their wide range of potential applications in nonlinear photonics [1,2]. Their advantages over solid-core glass fibers include broad transparency from the UV to the mid-IR and enhanced nonlinear optical effects. For instance, enhanced stimulated Raman scattering (SRS) has recently been demonstrated using carbon disulfide, Toluene or ethanol nonlinear liquids in integrated all-fiber systems compatible with standard single-mode fibers (SMFs) [1,2].

  • 29.
    Franciscangelis, C.
    et al.
    State University of Campinas, Brazil.
    Margulis, Walter
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Floridia, C.
    CPqD, Brazil.
    Rosolem, J. B.
    CPqD, Brazil.
    Salgado, F. C.
    CPqD, Brazil.
    Nyman, T.
    Saab AB, Sweden.
    Petersson, M.
    Saab AB, Sweden.
    Hallander, P.
    Saab AB, Sweden.
    Hällstrom, S.
    KTH Royal Institute of Technology, Sweden.
    Söderquist, I.
    Saab AB, Sweden.
    Fruett, F.
    State University of Campinas, Brazil.
    Vibration measurement on composite material with embedded optical fiber based on phase-OTDR2017Inngår i: Proceedings of SPIE - The International Society for Optical Engineering Volume 10168, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2017; 101683Q (2017), 2017, artikkel-id 101683QKonferansepaper (Fagfellevurdert)
    Abstract [en]

    Distributed sensors based on phase-optical time-domain reflectometry (phase-OTDR) are suitable for aircraft health monitoring due to electromagnetic interference immunity, small dimensions, low weight and flexibility. These features allow the fiber embedment into aircraft structures in a nearly non-intrusive way to measure vibrations along its length. The capability of measuring vibrations on avionics structures is of interest for what concerns the study of material fatigue or the occurrence of undesirable phenomena like flutter. In this work, we employed the phase-OTDR technique to measure vibrations ranging from some dozens of Hz to kHz in two layers of composite material board with embedded polyimide coating 0.24 numerical aperture single-mode optical fiber. © 2017 SPIE.

  • 30.
    Franciscangelis, Carolina
    et al.
    University of Campinas, Brazil.
    Fruett, Fabiano
    University of Campinas, Brazil.
    Margulis, Walter
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Kjellberg, Leif
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Floridia, Claudio
    CPqD, Brazil.
    Real-time multiple machines sound listening using a phase-OTDR based distributed microphone2017Inngår i: SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference, IMOC 2017, 2017Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We propose and experimentally demonstrate a spatially tunable phase-OTDR based distributed microphone for listening to the sound of multiple machines. The distributed acoustic sensing capability, allied with the real-time spatial tuning, enables listening to a drill and to a cooling water system pump placed in two different sections along a single optical fiber, one at a time. The recorded acoustic waveform profile of both machines agreed with their operating cycles. Moreover, the sounds generated by both engines are successfully distinguished with the proposed method even when both machines are operating simultaneously..

  • 31.
    Franciscangelis, Carolina
    et al.
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Lindblom, Magnus
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Margulis, Walter
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Hey Tow, Kenny
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Sjölander, Ola
    KTH Royal Institute of Technology, Sweden.
    Kahlman, Lars
    SKF AB, Sweden.
    Bankeström, Olle
    SKF AB, Sweden.
    On-field validation of real-Time phase-OTDR for roller bearing monitoring2019Inngår i: Proceedings of SPIE - The International Society for Optical Engineering, SPIE , 2019Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This work presents an on-field validation of an in-house built real-Time phase-OTDR for monitoring the status of roller bearings. The acoustic sensor prototype was designed and assembled at RISE and evaluated on a 1 m diameter bearing at SKF AB facilities in Göteborg, Sweden. A 0.24 numerical aperture single-mode optical fiber was installed in the bearing lubrication groove, which is 50 mm large and 5 mm deep. Tests were performed to verify the response of the phaseOTDR to acoustic emissions in the bearing such as hammer hits and running the rollers at different loads. The fiber optic sensor results agree with the measurements performed by a standard industrial high sensitivity electronic accelerometer used for comparison. Moreover, as opposed to the reference electronic sensor, the phase-OTDR proved to be insensitive to electrical disturbances present on the environment.

  • 32.
    Garcia-Ruiz, Andres
    et al.
    University of Alcalá, Spain.
    Martins, Hugo
    University of Alcalá, Spain.
    Magalhães, Regina
    University of Alcalá, Spain.
    Pereira, Joao
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Tarasenko, Oleksandr
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Norin, Lars
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Margulis, Walter
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Martin-Lopez, Sonia
    University of Alcalá, Spain.
    Gonzalez-Herraez, Miguel
    University of Alcalá, Spain.
    Hermetic all-fiber phase modulators using Joule heating in carbon-coated fibers2018Inngår i: Optics InfoBase Conference Papers, 2018Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Certain applications of fiber sensors (e.g. avionics, oil industry) imply extreme operating conditions spurring the development of hermetic all-fiber devices. We present a hermetic all-fiber phase modulator based on Joule heating in a carbon-coated fiber. 

  • 33.
    Garcia-Ruiz, Andres
    et al.
    University of Alcala, Spain.
    Martins, Hugo
    University of Alcala, Spain.
    Magalhães, Regina
    University of Alcala, Spain.
    Pereira, Joao
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Tarasenko, Oleksandr
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Norin, Lars
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Margulis, Walter
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Martin-Lopez, Sonia
    University of Alcala, Spain.
    Gonzalez-Herraez, Miguel
    University of Alcala, Spain.
    Hermetic carbon coatings for electro-thermal all-fiber phase modulators2019Inngår i: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 37, nr 18, s. 4567-4572Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Joule effect and thermal response of several carbon coated fibers are modelled and analysed. An electro thermally driven all-fiber phase modulator based on these principles is proposed and a proof of concept of it is characterized. This kind of fibers could be the basis for developing all fiber components aimed to operate in environments where the strength increase and impermeability to hydrogen diffusion guaranteed by the carbon coating is crucial.

  • 34.
    Gerosa, Rodrigo M.
    et al.
    Universidade Presbiteriana Mackenzie/Mackpesquisa, Brazil.
    Sudirman, Aziza
    RISE., Swedish ICT, Acreo. KTH Royal Institute of Technology, Sweden; .
    Menezes, Leonardo de S.
    Universidade Federal de Pernambuco, Brazil.
    De Matos, Christiano José Santiago D.
    Universidade Presbiteriana Mackenzie/Mackpesquisa, Brazil.
    Margulis, Walter
    RISE., Swedish ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    All-fiber high-flow microfluidic dye laser2013Inngår i: Optics InfoBase Conference Papers, Optical Society of America (OSA) , 2013Konferansepaper (Fagfellevurdert)
    Abstract [en]

    An all-fiber dye laser is demonstrated. The dye solution is kept under flow, allowing for high repetition rate pumping. Threshold average pump power of 2.15 mW and conversion slope efficiency of ~8.5% are achieved.

  • 35.
    Gerosa, Rodrigo M.
    et al.
    Mackenzie Presbyterian University, Brazil.
    Sudirman, Aziza
    RISE., Swedish ICT, Acreo, Fiber Optics. KTH Royal Institute of Technology, Sweden.
    Menezes, Leonardo de S.
    Federal University of Pernambuco, Brazil.
    Margulis, Walter
    RISE., Swedish ICT, Acreo, Fiber Optics. KTH Royal Institute of Technology, Sweden.
    de Matos, Christiano J. S.
    Mackenzie Presbyterian University, Brazil.
    All-fiber high repetition rate dye laser2015Inngår i: Optical Society of America. Journal A: Optics, Image Science, and Vision, ISSN 1084-7529, E-ISSN 1520-8532, Vol. 2, nr 2, s. 186-193Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Optofluidic dye lasers may play a significant role in future laser applications in numerous areas, combining wavelength flexibility with integration and ease of operation. Nevertheless, no all-fiber integrated dye lasers have been demonstrated so far. In this paper, we report on a series of optofluidic all-fiber Rhodamine optical sources operating at a repetition rate as high as 1 kHz. Dye bleaching is avoided by circulating the Rhodamine dye during optical excitation. The laser radiation is extracted via conventional fibers that are spliced to the dye-filled capillary active medium. A tuneable amplified spontaneous emission source, a multimode laser, and a few transverse-mode laser are demonstrated by adjusting the setup. Threshold pump energies as low as similar to 1 mu J and slope efficiencies of up to mu 9% were obtained, indicating the potential for realworld applications in areas such as spectroscopy and biomedicine.

  • 36.
    Gladyshev, Alexey V.
    et al.
    Russian Academy of Sciences, Russia.
    Corbari, Costantino
    University of Southampton, UK.
    Tarasenko, Oleksander
    RISE., Swedish ICT, Acreo.
    Yatsenko, Yu P.
    Russian Academy of Sciences, Russia.
    Semjonov, Sexrgei L.
    Russian Academy of Sciences, Russia.
    Margulis, Walter
    RISE., Swedish ICT, Acreo.
    Kazansky, Peter G.
    University of Southampton, UK.
    Hernandez, Yves
    Multitel, Belgium.
    Second-order nonlinearity in optical fibers: Achievements and perspectives2016Inngår i: Optics InfoBase Conference Papers: Bragg Gratings, Photosensitivity and Poling in Glass Waveguides and Materials, 2016Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Recent progress in thermal poling of silica fibers is reviewed. It is demonstrated that state-of-the-art poled fibers can be used in a number of practical applications. Challenges for further development of poled fiber devices are discussed and possible solutions proposed.

  • 37.
    Gouvêa, Paula M. P.
    et al.
    Pontifical Catholic University of Rio de Janeiro, Brazil.
    Rugeland, Patrik
    RISE., Swedish ICT, Acreo.
    Gomes, Marcos S. P.
    Pontifical Catholic University of Rio de Janeiro, Brazil.
    Margulis, Walter
    RISE., Swedish ICT, Acreo.
    Component and setup for insertion of gases in a hollow-core optical fiber sensor2015Inngår i: 24th International Conference on Optical Fibre Sensors / [ed] Hypolito José Kalinowski, José Luís Fabris, Wojtek J. Bock, 2015, Vol. 9634, artikkel-id 96343DKonferansepaper (Fagfellevurdert)
    Abstract [en]

    An optical fiber component and setup were developed to insert and remove gases from hollow-core optical fibers, allowing gas/light mixing over the length of the fiber for gas sensing applications. Transmitted signals acquired at the output of the fiber contain information regarding absorption occurring inside the fiber, providing a spectroscopic signature of the gas or gases in the fiber. Spectra for 1 atm of acetylene (C2H2) around 1525 nm and 1 atm of carbon dioxide (CO2) around 1432 nm were obtained and compared to HITRAN data, showing good agreement. The setup can also be used to prepare gas cells.

  • 38.
    Graziosi, Marcello
    et al.
    RISE., Swedish ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Margulis, Walter
    RISE., Swedish ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Tarasenko, Oleksander
    RISE., Swedish ICT, Acreo.
    Electric field measurement with poled fiber in a sagnac interferometer2013Inngår i: Optics InfoBase Conference Papers, Optical Society of America (OSA) , 2013Konferansepaper (Fagfellevurdert)
    Abstract [en]

    E-field sensing with a thermally poled fiber in a Sagnac interferometer is presented. Contactless detection is achieved for fields > 0:23MV=m at 50Hz and higher sensitivity is obtained at higher frequencies.

  • 39.
    Guzman-Sepulveda, Jose Rafael
    et al.
    Universidad Autónoma de Tamaulipas, Mexico.
    Arredondo-Lucio, J. A.
    Universidad Autónoma de Tamaulipas, Mexico.
    Margulis, Walter
    RISE., Swedish ICT, Acreo.
    May-Arrioja, Daniel Alberto
    Universidad Autónoma de Tamaulipas, Mexico.
    Salinity sensor using a two-core optical fiber2012Inngår i: Frontiers in Optics, FIO 2012, 2012Konferansepaper (Fagfellevurdert)
    Abstract [en]

    A salinity sensor based on a Two-Core optical fiber is demonstrated. The sensor response and sensitivity can be easily adjusted by simply controlling an etching process to expose the off-axis core. The proposed RI sensor exhibits a sensitivity exceeding 1,400 nm/RIU for salinity concentrations below 1 M.

  • 40.
    Guzman-Sepulveda, José Rafael
    et al.
    Universidad Autónoma de Tamaulipas, Mexico.
    Lopez-Cortes, Daniel
    INAOE, Mexico.
    Hernandez-Romano, Iván
    INAOE, Mexico.
    Margulis, Walter
    RISE., Swedish ICT, Acreo.
    May-Arrioja, Daniel Alberto
    Universidad Autónoma de Tamaulipas, Mexico.
    Refractive index sensor using a two-core optical fiber2012Inngår i: Optics InfoBase Conference Papers, 2012, artikkel-id 6326480Konferansepaper (Fagfellevurdert)
    Abstract [en]

    A Refractive Index sensor based on a Two-Core optical fiber is demonstrated. The sensor response and sensitivity can be easily adjusted by simply controlling an etching process to expose the off-axis core. The proposed RI sensor exhibits a sensitivity exceeding 2,100 nm/RIU.

  • 41.
    Harish, A. V.
    et al.
    RISE Research Institutes of Sweden. KTH Royal Institute of Technology, Sweden.
    Kumar, T.
    KTH Royal Institute of Technology, Sweden.
    Russom, A.
    KTH Royal Institute of Technology, Sweden.
    Margulis, Walter
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Laurell, F.
    KTH Royal Institute of Technology, Sweden.
    Fiber based optofluidic micro-flow cytometer collecting side-scattered light2020Inngår i: OSA Technical Digest (Optical Society of America, 2020), paper AW3I.3, OSA - The Optical Society , 2020, artikkel-id AW31.3Konferansepaper (Fagfellevurdert)
    Abstract [en]

    A compact fiber capillary based microflow cytometer capable of detecting side-scattered-light is demonstrated by using a 450 angle-cleaved metal coated optical fiber tip.

  • 42.
    Harish, Acharya
    et al.
    RISE Research Institutes of Sweden. KTH Royal Institute of Technology, Sweden.
    Kumar, T.
    KTH Royal Institute of Technology, Sweden.
    Etcheverry, S
    RISE Research Institutes of Sweden.
    Russom, A.
    KTH Royal Institute of Technology, Sweden.
    Margulis, Walter
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Laurell, F.
    KTH Royal Institute of Technology, Sweden.
    Optofluidic fiber component to separate micron-sized particles using elasto-inertial focusing2020Inngår i: Optics InfoBase Conference Papers, OSA - The Optical Society , 2020Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Using various fiber capillaries with different diameters and multiple holes we develop an optofluidic component capable of separating micron-sized beads emulating cells and bacteria, exploiting particle focusing in a viscoelastic fluid and analyzed optically.  © 2020 The Author(s).

  • 43.
    Hellsing, M.
    et al.
    Materiex AB, Sweden.
    Fokine, M.
    RISE., Swedish ICT, Acreo.
    Claesson, Åsa
    RISE., Swedish ICT, Acreo.
    Nilsson, L. -E
    RISE., Swedish ICT, Acreo.
    Margulis, Walter
    RISE., Swedish ICT, Acreo.
    ToF-SIMS imaging of dopant diffusion in optical fibers2003Inngår i: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 203-204, s. 648-651Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Applications of optical fibers in telecommunication and sensing are rapidly emerging where the fiber properties are related to the controlled addition of dopants such as germanium, phosphorous, fluorine and erbium. The modern ToF-SIMS instrument, with its high sensitivity and high lateral resolution, has shown to be an excellent tool to directly analyze cross-sections of as-manufactured fibers. The present work describes ToF-SIMS imaging of the dopant distribution in fluorine, germanium and rare-earth doped fibers where dopants are confined to a few μm in the core. The increased fluorine diffusion in the fluorine doped fibers due to chemical reactions with hydroxyl groups was examined. This process is utilized in the manufacture of thermally stable chemical composition fiber Bragg gratings. We were able to produce ToF-SIMS elemental images with a lateral resolution around 0.5μm showing the detailed distribution of the dopants.

  • 44.
    Hey Tow, Kenny
    et al.
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Forsberg, Frans
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Margulis, Walter
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Carbon dioxide and carbon monoxide concentration monitoring for improved carbon capture and storage: From laboratory to a field test in a cement plant2019Inngår i: Proceedings of SPIE - The International Society for Optical Engineering, SPIE , 2019Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The cement industry is facing pressure to find technological solutions in reducing greenhouse gas emissions owing to the large amount of process emissions originating from the calcination of limestone. In this communication, an all-fibre gas monitoring system based on anti-resonant hollow-core fibres is proposed. An on-field test was performed in the harsh environment of a cement factory and it demonstrated the feasibility of using this system for low-concentration carbon dioxide and carbon monoxide monitoring in exhaust fumes

  • 45.
    Jason, Johan
    et al.
    Mid Sweden University, Sweden; Fiberson AB, Sweden.
    Rugeland, Patrik
    RISE., Swedish ICT, Acreo.
    Tarasenko, Oleksandr
    RISE., Swedish ICT, Acreo.
    Margulis, Walter
    RISE., Swedish ICT, Acreo.
    Nilsson, Hans-Erik
    Mid Sweden University, Sweden.
    Temperature characteristics of the birefringence properties of filled side-hole fibers2013Inngår i: Applied Optics, ISSN 0003-6935, E-ISSN 1539-4522, Vol. 52, nr 21, s. 5208-5215Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The temperature characteristics of the birefringence of side-hole fibers filled with liquids or metal are investigated, aiming at providing a basis for on/off temperature sensing. Short pieces of fiber are filled and the change in birefringence is registered using measurements in reflective mode of the transmitted power through a linear polarizer at 1550 nm. The rapid change in the birefringence behavior of the fiber at the temperature of the phase transition of the filler substance is shown, and from the measurement data the phase transition temperatures can be determined as well as an estimation of the birefringence change with temperature. The experimental results are supported by numerical simulations.

  • 46.
    Jelger, P.
    et al.
    KTH Royal Institute of Technology, Sweden.
    Laurell, F.
    KTH Royal Institute of Technology, Sweden.
    Pasiskevicius, V.
    KTH Royal Institute of Technology, Sweden.
    Enström, A.
    RISE., Swedish ICT, Acreo.
    Claesson, Åsa
    RISE., Swedish ICT, Acreo.
    Margulis, Walter
    RISE., Swedish ICT, Acreo.
    An in-fibre microcavity2007Inngår i: Opt.InfoBase Conf. Papers, Optical Society of America , 2007Konferansepaper (Fagfellevurdert)
    Abstract [en]

    A novel all-fiber spliced microcavity for chemical and biological optical studies is described. Its design allows coupling with low loss light from a fiber into a liquid or gas contained in a capillary or PCF. 

  • 47.
    Konstantinou, Maria G.
    et al.
    Foundation for Research and Technology-Hellas, Greece.
    Kosma, Kyriaki
    Foundation for Research and Technology-Hellas, Greece.
    Margulis, Walter
    RISE., Swedish ICT, Acreo.
    Pissadakis, Stavros
    Foundation for Research and Technology-Hellas, Greece.
    A microspherical resonator embedded inside a microstructured optical fiber taper2015Inngår i: Workshop on Specialty Optical Fibers and their Applications (WSOF 2015), 2015, artikkel-id WT4A.23Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The integration of a microspherical whispering gallery mode (WGM) resonator inside a microstructured optical fiber taper is demonstrated. Preliminary WGM spectra of this in-fiber resonator in transmission mode are presented and discussed.

  • 48.
    Konstantinou, Maria Georgia
    et al.
    Foundation for Research and Technology – Hellas, Greece; National Technical University of Athens, Greece.
    Milenko, Karolina
    Foundation for Research and Technology – Hellas, Greece.
    Kosma, Kyriaki
    Foundation for Research and Technology – Hellas, Greece.
    Margulis, Walter
    RISE., Swedish ICT, Acreo.
    Pissadakis, Stavros
    Foundation for Research and Technology – Hellas, Greece.
    Light coupling and routing using a microsphere attached on the endface of a microstructured optical fiber2016Inngår i: Proceedings of SPIE: Micro-Structured and Specialty Optical Fibres IV, 2016, Vol. 9886, artikkel-id 98860IKonferansepaper (Fagfellevurdert)
    Abstract [en]

    Herein, we demonstrated a T-shaped whispering gallery modes (WGMs) excitation system including a tapered single mode fiber (SMF), a tapered microstructured optical fiber (MOF) and a BaTiO3 microsphere for efficient light coupling and routing between the two fibers. The BaTiO3 microsphere is semi-immersed into the capillary of a tapered MOF, while the tapered SMF is placed perpendicularly to MOF in a contact with equatorial region of the microsphere. Based on that, three channels joined by the microsphere are formed, and excitation and measurement of WGMs is possible either using the SMF or the MOF taper. The measured WGMs spectra reveal light routing along Q-factors between 4500 and 6100, along with scattering signal with all three fiber ports and parities.

  • 49.
    Kumar, T.
    et al.
    KTH Royal Institute of Technology, Sweden.
    Harish, A. V.
    KTH Royal Institute of Technology, Sweden.
    Etcheverry, Sebastian
    RISE Research Institutes of Sweden.
    Margulis, Walter
    RISE Research Institutes of Sweden.
    Laurell, F.
    KTH Royal Institute of Technology, Sweden.
    Russom, A.
    KTH Royal Institute of Technology, Sweden.
    Lab-in-a-fiber-based integrated particle separation and counting2023Inngår i: Lab on a Chip, ISSN 1473-0197, E-ISSN 1473-0189, Vol. 23, s. 2286-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    An all-fiber integrated device capable of separating and counting particles is presented. A sequence of silica fiber capillaries with various diameters and longitudinal cavities are used to fabricate the component for size-based elasto-inertial passive separation of particles followed by detection in an uninterrupted continuous flow. Experimentally, fluorescent particles of 1 μm and 10 μm sizes are mixed in a visco-elastic fluid and fed into the all-fiber separation component. The particles are sheathed by an elasticity enhancer (PEO - polyethylene oxide) to the side walls. Larger 10 μm particles migrate to the center of the silica capillary due to the combined inertial lift force and elastic force, while the smaller 1 μm particles are unaffected, and exit from a side capillary. A separation efficiency of 100% for the 10 μm and 97% for the 1 μm particles is achieved at a total flow rate of 50 μL min−1. To the best of our knowledge, this is the first time effective inertial-based separation has been demonstrated in circular cross-section microchannels. In the following step, the separated 10 μm particles are routed through another all-fiber component for counting and a counting throughput of ∼1400 particles per min is demonstrated. We anticipate the ability to combine high throughput separation and precise 3D control of particle position for ease of counting will aid in the development of advanced microflow cytometers capable of particle separation and quantification for various biomedical applications. 

  • 50.
    Lago, L.
    et al.
    Multitel ASBL, Belgium.
    Corbari, C.
    University of Southampton, UK.
    Gladyshev, A. V.
    Fibre Optics Research Center, Russia.
    Kazansky, P. G.
    University of Southampton, UK.
    Tarasenko, O.
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Margulis, Walter
    RISE., Swedish ICT, Acreo.
    Hernandez, Y.
    Multitel ASBL, Belgium.
    Specialty fibres and components for advanced microscopy2014Inngår i: Specialty Optical Fibers, SOF 2014, 2014Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We investigate fibre basic functions like SHG and pulse gating. We achieved 5.2% conversion efficiency into green light with 50 W peak pump power and demonstrated in-fibre pulse gating at 1 MHz repetition rate. © 2014 OSA.

12 1 - 50 of 88
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