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Publications (10 of 33) Show all publications
Del Rosso, T., Margulis, W., Fontana, J. & Carvalho, I. C. .. (2019). 10 - Plasmonics for the Characterization of Metal Organic Films and Nanoparticles. In: Metal Nanostructures for Photonics: (pp. 223-259). Elsevier
Open this publication in new window or tab >>10 - Plasmonics for the Characterization of Metal Organic Films and Nanoparticles
2019 (English)In: Metal Nanostructures for Photonics, Elsevier , 2019, p. 223-259Chapter in book (Other academic)
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.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Surface plasmon resonance spectroscopy, Organic thin films, Metal nanoparticles, Graphene, Liquid crystals, Plasmonics, Electric field, Alignment, Display, Electro-optical switching, Optical fibers
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-36357 (URN)
Available from: 2018-12-14 Created: 2018-12-14 Last updated: 2018-12-14Bibliographically approved
Magalhaes, R., Garcia-Ruiz, A., Martins, H., Pereira, J., Margulis, W., Martin-Lopez, S. & Gonzalez-Herraez, M. (2019). Fiber-based distributed bolometry. Optics Express, 27(4), 4317-4328
Open this publication in new window or tab >>Fiber-based distributed bolometry
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2019 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 27, no 4, p. 4317-4328Article in journal (Refereed) Published
Abstract [en]

Optical fibers are inherently designed to allow no interaction between the guided light and the surrounding optical radiation. Thus, very few optical fiber-based technologies exist in the field of optical radiation sensing. Accomplishing fully-distributed optical radiation sensing appears then as even more challenging since, on top of the lack of sensitivity explained above, we should add the need of addressing thousands of measurement points in a single, continuous optical cable. Nevertheless, it is clear that there exist a number of applications which could benefit from such a distributed sensing scheme, particularly if the sensitivity was sufficiently high to be able to measure correctly variations in optical radiation levels compatible with the earth surface. Distributed optical radiation sensing over large distances could be employed in applications such as Dynamic Line Rating (DLR), where it is known that solar radiation can be an important limiting factor in energy transmission through overhead power cables, and also in other applications such as thermo-solar energy. In this work, we present the proof-of-concept of the first distributed bolometer based on optical fiber technology and capable of detecting absolute changes of irradiance. The core idea of the system is the use of a special fiber coating with high emissivity (e.g., carbon coating or black paint). The high absorption of these coatings translates into a temperature change that can be read with sufficiently high sensitivity using phase-sensitive reflectometry. To demonstrate the concept, we interrogate distinct black-coated optical fibers using a chirped-pulse ÖOTDR, and we readily demonstrate the detection of light with resolutions in the order of 1% of the reference solar irradiance, offering a high-potential technology for integration in the aforementioned applications.

Keywords
Bolometers, Cables, Coatings, Optical fibers, Sensitivity analysis, Solar energy, Solar radiation, Textile fibers, Coated optical fibers, Distributed sensing, Dynamic line rating(DLR), Energy transmission, Fiber-based technology, Measurement points, Optical radiations, Temperature changes, Optical cables
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-38242 (URN)10.1364/OE.27.004317 (DOI)2-s2.0-85062047306 (Scopus ID)
Note

 Funding details: European Commission, EC, MSCA-ITN-ETN-722509; Funding text 1: H2020 European Research Council through project U FINE (307441); European Commission (MSCA-ITN-ETN-722509); DOMINO Water JPI project, under the WaterWorks2014 cofounded call by Horizon 2020 Framework Programme (European Union) and Ministerio de Economia y Competitividad, Spain; Ministerio de Economía y Competitividad, Spain (TEC2015-71127-C2-2-R, "Ramón y Cajal" contract); Sensores e INstrumentación en tecnologías FOTÓNicas (S2013/MIT-2790).

Available from: 2019-03-29 Created: 2019-03-29 Last updated: 2019-03-29Bibliographically approved
Magalhães, R., Garcia-Ruiz, A., Martins, H., Pereira, J., Margulis, W., Martin-Lopez, S. & González-Herráez, M. (2018). Distributed detection of optical radiation using chirped-pulse phase-sensitive optical time domain reflectometry. In: Optics InfoBase Conference Papers: . Paper presented at Optical Fiber Sensors, OFS 2018, 24 September 2018 through 28 September 2018.
Open this publication in new window or tab >>Distributed detection of optical radiation using chirped-pulse phase-sensitive optical time domain reflectometry
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2018 (English)In: Optics InfoBase Conference Papers, 2018Conference paper, Published paper (Refereed)
Keywords
Fiber optic sensors, Carbon coated optical fibers, Chirped pulse, Distributed detection, Optical radiations, Optical time domain reflectometry, Solar irradiances, Optical fibers
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-37057 (URN)2-s2.0-85059471058 (Scopus ID)9781557528209 (ISBN)
Conference
Optical Fiber Sensors, OFS 2018, 24 September 2018 through 28 September 2018
Available from: 2019-01-21 Created: 2019-01-21 Last updated: 2019-01-21Bibliographically approved
Garcia-Ruiz, A., Martins, H., Magalhães, R., Pereira, J., Tarasenko, O., Norin, L., . . . Gonzalez-Herraez, M. (2018). Hermetic all-fiber phase modulators using Joule heating in carbon-coated fibers. In: Optics InfoBase Conference Papers: . Paper presented at Optical Fiber Sensors, OFS 2018, 24 September 2018 through 28 September 2018.
Open this publication in new window or tab >>Hermetic all-fiber phase modulators using Joule heating in carbon-coated fibers
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2018 (English)In: Optics InfoBase Conference Papers, 2018Conference paper, Published paper (Refereed)
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. 

Keywords
Carbon, Fiber optic sensors, Joule heating, Modulators, Phase modulation, A-carbon, All fiber, All-fiber devices, Carbon-coated, Fiber Sensor, Oil industries, Operating condition, Phase modulator, Optical fibers
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-37037 (URN)2-s2.0-85059445198 (Scopus ID)9781557528209 (ISBN)
Conference
Optical Fiber Sensors, OFS 2018, 24 September 2018 through 28 September 2018
Note

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Available from: 2019-01-21 Created: 2019-01-21 Last updated: 2019-01-21Bibliographically approved
Margulis, W. (2018). Integration of optoelectronics into fibres enhances textiles. Nature, 560(7717), 170-171
Open this publication in new window or tab >>Integration of optoelectronics into fibres enhances textiles
2018 (English)In: Nature, ISSN 0028-0836, E-ISSN 1476-4687, Vol. 560, no 7717, p. 170-171Article in journal (Other academic) Published
National Category
Engineering and Technology
Identifiers
urn:nbn:se:ri:diva-37598 (URN)10.1038/d41586-018-05873-9 (DOI)2-s2.0-85059798578 (Scopus ID)
Available from: 2019-01-28 Created: 2019-01-28 Last updated: 2019-01-29Bibliographically approved
Etcheverry, S., Araujo, L., Carvalho, I., Margulis, W. & Fontana, J. (2018). Sub-microsecond switching times using dynamically tunable plasmonic pixels. In: : . Paper presented at APS March Meeting 2018. American Physical Society
Open this publication in new window or tab >>Sub-microsecond switching times using dynamically tunable plasmonic pixels
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2018 (English)Conference paper, Oral presentation with published abstract (Refereed)
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.

Place, publisher, year, edition, pages
American Physical Society, 2018
National Category
Engineering and Technology
Identifiers
urn:nbn:se:ri:diva-37599 (URN)
Conference
APS March Meeting 2018
Available from: 2019-01-28 Created: 2019-01-28 Last updated: 2019-01-29Bibliographically approved
Etcheverry, S., Russom, A., Laurell, F. & Margulis, W. (2018). Trapping and optical identification of microparticles in a liquid with a functional optical fiber probe. In: Conference on Lasers and Electro-Optics OSA Technical Digest (online) (Optical Society of America, 2018), paper AM4P.6: . Paper presented at CLEO: Applications and Technology 2018 San Jose, California United States 13–18 May 2018.
Open this publication in new window or tab >>Trapping and optical identification of microparticles in a liquid with a functional optical fiber probe
2018 (English)In: Conference on Lasers and Electro-Optics OSA Technical Digest (online) (Optical Society of America, 2018), paper AM4P.6, 2018Conference paper, Published paper (Refereed)
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.

Keywords
Optical fibers, Environmental Monitoring, Fiber cores, Fluid suctions, Life-sciences, Micro-particles, Micrometer particle, Optical fiber probe, Optical identification, Probes
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-34483 (URN)10.1364/CLEO_AT.2018.AM4P.6 (DOI)2-s2.0-85049141163 (Scopus ID)9781557528209 (ISBN)
Conference
CLEO: Applications and Technology 2018 San Jose, California United States 13–18 May 2018
Available from: 2018-08-09 Created: 2018-08-09 Last updated: 2019-03-07Bibliographically approved
Alcusa-Saez, E. P., Diez, A., Rivera-Perez, E., Margulis, W., Norin, L. & Andres, M. V. (2017). All-fiber acousto-optic tunable filter in polyimide coated optical fibers. In: International Conference on Transparent Optical Networks: . Paper presented at 19th International Conference on Transparent Optical Networks, ICTON 2017, 2 July 2017 through 6 July 2017, Girona Spain.
Open this publication in new window or tab >>All-fiber acousto-optic tunable filter in polyimide coated optical fibers
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2017 (English)In: International Conference on Transparent Optical Networks, 2017Conference paper, Published paper (Refereed)
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.

Keywords
acousto-optic filter, optical fibers
National Category
Computer and Information Sciences
Identifiers
urn:nbn:se:ri:diva-32494 (URN)10.1109/ICTON.2017.8025093 (DOI)2-s2.0-85030977343 (Scopus ID)9781538608586 (ISBN)
Conference
19th International Conference on Transparent Optical Networks, ICTON 2017, 2 July 2017 through 6 July 2017, Girona Spain
Available from: 2017-11-09 Created: 2017-11-09 Last updated: 2019-02-06Bibliographically approved
Etcheverry, S., Araujo, L. F., Carvalho, I. C. S., Margulis, W. & Fontana, J. (2017). Digital electric field induced switching of plasmonic nanorods using an electro-optic fluid fiber. Applied Physics Letters, 111(22), Article ID 221108.
Open this publication in new window or tab >>Digital electric field induced switching of plasmonic nanorods using an electro-optic fluid fiber
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2017 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 111, no 22, article id 221108Article in journal (Refereed) Published
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).

Keywords
Diffusion in liquids, Electric fields, Plasmons, Remote sensing, Switching, Digital switching, Electric-field directions, Electric-field-induced switching, Fiber components, High Speed, Rotational diffusion, Sub-microsecond, Switching time, Nanorods
National Category
Computer and Information Sciences
Identifiers
urn:nbn:se:ri:diva-33151 (URN)10.1063/1.5001702 (DOI)2-s2.0-85037172859 (Scopus ID)
Note

Funding details: 006/12, STINT, Swedish Foundation for International Cooperation in Research and Higher Education; Funding details: CNPq, Conselho Nacional de Desenvolvimento Científico e Tecnológico; Funding details: STINT, Swedish Foundation for International Cooperation in Research and Higher Education; Funding details: VR, Vetenskapsrådet; Funding details: CONICYT, Comisión Nacional de Investigación Científica y Tecnológica; Funding details: ONR, Office of Naval Research; Funding details: CAPES, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior; Funding details: ONRG-NICOP-N62909-15-1-N016, ONRG, Office of Naval Research Global; Funding details: CONICYT, Consejo Nacional de Innovación, Ciencia y Tecnología

Available from: 2018-01-31 Created: 2018-01-31 Last updated: 2019-01-22Bibliographically approved
Munoz, D. M., Franciscangelis, C., Margulis, W., Fruett, F. & Soderquist, I. (2017). Low latency disturbance detection using distributed optical fiber sensors. In: Proceedings of the 2017 IEEE 14th International Conference on Networking, Sensing and Control, ICNSC 2017: . Paper presented at 14th IEEE International Conference on Networking, Sensing and Control, ICNSC 2017, 16 May 2017 through 18 May 2017 (pp. 372-377).
Open this publication in new window or tab >>Low latency disturbance detection using distributed optical fiber sensors
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2017 (English)In: Proceedings of the 2017 IEEE 14th International Conference on Networking, Sensing and Control, ICNSC 2017, 2017, p. 372-377Conference paper, Published paper (Refereed)
Abstract [en]

Distributed optical fiber sensors based on phase-sensitive optical time domain reflectometry (Φ-OTDR) are feasible options to detect perturbations in kilometric security perimeters or mechanical structures. This technique takes advantage of electromagnetic interference immunity, small dimensions, lightweight, flexibility, and capability. Moreover, this technique can be combined with dedicated hardware architectures, in order to improve its performance and reliability. This work proposes the use of parallel hardware architectures to implement real-time detecting and locating perturbations in a Φ-OTDR distributed optical fiber vibration sensor. Hardware architectures of the iterative moving average filter and the Sobel filter were mapped on field programmable gate arrays, exploring the intrinsic parallelism in order to achieve real-time requirements. A performance comparison between the proposed solutions was addressed in terms of hardware cost, latency and power consumption.

Keywords
Distributed sensors, FPGAs, Hardware architectures, Optical fiber vibration sensors, Optical time-domain reflectometer (OTDR), Electromagnetic pulse, Fiber optic sensors, Fibers, Field programmable gate arrays (FPGA), Hardware, Iterative methods, Optical fibers, Reflectometers, Ventilation exhausts, Distributed optical fiber, Distributed optical fiber sensors, Distributed sensor, Hardware architecture, Optical time domain reflectometer, Optical time domain reflectometry, Performance and reliabilities, Vibration sensors, Time domain analysis
National Category
Computer and Information Sciences
Identifiers
urn:nbn:se:ri:diva-32499 (URN)10.1109/ICNSC.2017.8000121 (DOI)2-s2.0-85028506370 (Scopus ID)9781509044283 (ISBN)
Conference
14th IEEE International Conference on Networking, Sensing and Control, ICNSC 2017, 16 May 2017 through 18 May 2017
Available from: 2017-11-09 Created: 2017-11-09 Last updated: 2018-08-15Bibliographically approved
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-8058-2140

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