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  • 1.
    Camara, Alexandre R.
    et al.
    Rio de Janeiro State University, Brazil; Pontifical Catholic University of Rio de Janeiro, Brazil.
    Pereira, Joao M. B.
    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 fiber2015Ingår i: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 23, nr 14, s. 18060-18069Artikel i tidskrift (Refereegranskat)
    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.

  • 2.
    Candiani, A
    et al.
    RISE., Swedish ICT, Acreo, Fiber Optics.
    Margulis, W
    VIKTORIA.
    Konstantaki, M
    RISE., Swedish ICT, Acreo, Fiber Optics.
    Pissadakis, S
    RISE., Swedish ICT, Acreo, Fiber Optics.
    Ferrofluid-infiltrated optical fibers for shear-sensing smart pads2012Ingår i: SPIE NewsroomArtikel i tidskrift (Övrigt vetenskapligt)
  • 3.
    Etcheverry, Sebastián
    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 fibers2015Ingår i: Novel Biophotonics Techniques and Applications III / [ed] Arjen Amelink, I. Alex Vitkin, 2015, Vol. 9540, artikel-id 95400NKonferensbidrag (Refereegranskat)
    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.

  • 4.
    Foote, P
    et al.
    RISE., Swedish ICT, Acreo, Fiber Optics.
    Breidne, M
    RISE., Swedish ICT, Acreo, Fiber Optics.
    Levin, K
    RISE., Swedish ICT, Acreo, Fiber Optics.
    Papadopolous, P
    RISE., Swedish ICT, Acreo, Fiber Optics.
    Read, I
    RISE., Swedish ICT, Acreo, Fiber Optics.
    Signorazzi, M
    RISE., Swedish ICT, Acreo, Fiber Optics.
    Nilsson, L-E
    RISE., Swedish ICT, Acreo, Fiber Optics.
    Stubbe, R
    RISE., Swedish ICT, Acreo, Fiber Optics.
    Claesson, Å
    RISE., Swedish ICT, Acreo, Fiber Optics.
    Operational load monitoring using optical fibre sensors2004Ingår i: Health monitoring of aerospace structures: Smart sensor technologies and signal processing / [ed] Staszewski, W., Boller, C., and Tomlinson, G., West Sussex, England: John Wiley & Sons, 2004Kapitel i bok, del av antologi (Övrigt vetenskapligt)
  • 5.
    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 laser2015Ingår i: Optical Society of America. Journal A: Optics, Image Science, and Vision, ISSN 1084-7529, E-ISSN 1520-8532, Vol. 2, nr 2, s. 186-193Artikel i tidskrift (Refereegranskat)
    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.

  • 6.
    Margulis, W
    RISE., Swedish ICT, Acreo, Fiber Optics.
    Ch. 12: Poling of glasses and optical fibers2009Ingår i: Ch12 in Fiber Bragg Gratings by Kashyap, R. 2nd edition. ISBN 978-0-12-372579-0. Elsevier Publishing Co., Academic Press. California, USA. 2009., 2009Kapitel i bok, del av antologi (Övrigt vetenskapligt)
  • 7. Rehman, S
    et al.
    Claesson, Å
    RISE., Swedish ICT, Acreo, Fiber Optics.
    Specialty optical fibers make surgery less invasive2011Ingår i: BioPhotonicsArtikel i tidskrift (Övrigt vetenskapligt)
  • 8.
    Romagnoli, Priscila
    et al.
    Mackenzie Presbyterian University, Brazil.
    Rosa, Henrique G.
    Mackenzie Presbyterian University, Brazil.
    Lopez-Cortes, Daniel
    Mackenzie Presbyterian University, Brazil.
    Souza, Eunézio A. T.
    Mackenzie Presbyterian University, Brazil.
    Viana-Gomes, José C.
    National University of Singapore, Singapore.
    Margulis, Walter
    RISE., Swedish ICT, Acreo, Fiber Optics.
    de Matos, Christiano J. S.
    Mackenzie Presbyterian University, Brazil.
    Making Graphene Visible on Transparent Dielectric Substrates: Brewster Angle Imaging2015Ingår i: 2D Materials, ISSN 2053-1583, Vol. 2, nr 3, artikel-id 035017Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The visibility of graphene is greatly increased by illuminating samples deposited on transparent dielectrics at the substrates' Brewster angle. Using a commercial ellipsometer, the reflectivity of monolayers of chemical vapour deposition (CVD) graphene is found to be up to 33 times higher than that of the substrate, i.e., an optical contrast as high as 3200% is obtained, more than 380 times higher than with standard optical microscopy.

    Also, with a simpler, homemade, experimental setup, a 1400% optical contrast was measured for a monolayer of CVD graphene and linear features as small as ~20 μm were visible in a monolayer, while ~6 × 17 μm2trilayers could still be imaged in exfoliated samples.

    It is also shown that the reflectance/transmittance ratio increases quadratically with the number of graphene layers, which may allow for counting layer numbers and identifying wrinkles and folds in transferred samples.

  • 9.
    Rugeland, Patrik
    et al.
    RISE., Swedish ICT, Acreo, Fiber Optics.
    Sterner, Carola
    RISE., Swedish ICT, Acreo, Fiber Optics.
    Margulis, Walter
    RISE., Swedish ICT, Acreo, Fiber Optics.
    Visible light guidance in silica capillaries by antiresonant reflection2013Ingår i: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 21, nr 24, s. 29217-29222Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Hollow silica capillaries are examined as optical waveguides evaluating the antiresonant reflecting optical waveguide (ARROW) effect by sequentially reducing the wall thickness through etching and measuring the optical transmission. It is found that the periodicity of the transmission bands is proportional to the wall thickness and that the propagation loss is of the order of a few dB/m.

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