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  • 1. Camara, AR
    et al.
    Pereira, JMB
    Tarasenko, Oleksandr
    RISE, Swedish ICT, Acreo, Fiber Optics.
    Margulis, Walter
    RISE, Swedish ICT, Acreo, Fiber Optics.
    Carvalho, ICS
    Optical creation and erasure of the linear electrooptical effect in silica fiber2015In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 23, no 14, p. 18060-18069Article in journal (Refereed)
    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 pads2012In: SPIE NewsroomArticle in journal (Other academic)
  • 3.
    Etcheverry, S
    et al.
    RISE, Swedish ICT, Acreo, Fiber Optics.
    Sudirman, A
    RISE, Swedish ICT, Acreo, Fiber Optics.
    Margulis, W
    RISE, Swedish ICT, Acreo.
    Laurell, F
    Identification and collection of particles with optical fibers2015In: paper 9540-26, European Conferences on Biomedical Optics ECBO 2015, Munich, 2015., 2015Conference paper (Refereed)
    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 sensors2004In: 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, 2004Chapter in book (Other academic)
  • 5. Gerosa, RM
    et al.
    Sudirman, Aziza
    RISE, Swedish ICT, Acreo, Fiber Optics.
    Menezes, LdS
    Margulis, Walter
    RISE, Swedish ICT, Acreo, Fiber Optics.
    de Matos, CJS
    All-fiber high repetition rate dye laser2015In: Optical Society of America. Journal A: Optics, Image Science, and Vision, ISSN 1084-7529, E-ISSN 1520-8532, Vol. 2, no 2, p. 186-193Article in journal (Refereed)
    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 fibers2009In: Ch12 in Fiber Bragg Gratings by Kashyap, R. 2nd edition. ISBN 978-0-12-372579-0. Elsevier Publishing Co., Academic Press. California, USA. 2009., 2009Chapter in book (Other academic)
  • 7. Rehman, S
    et al.
    Claesson, Å
    RISE, Swedish ICT, Acreo, Fiber Optics.
    Specialty optical fibers make surgery less invasive2011In: BioPhotonicsArticle in journal (Other academic)
  • 8. Romagnoli, P
    et al.
    Rosa, HG
    Lopez-Cortes, D
    Souza, EAT
    Viana-Gomes, JC
    Margulis, Walter
    RISE, Swedish ICT, Acreo, Fiber Optics.
    de Matos, CJS
    Making Graphene Visible on Transparent Dielectric Substrates: Brewster Angle Imaging2015In: 2D Materials, ISSN 2053-1583, Vol. 2, no 3Article in journal (Refereed)
    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 reflection2013In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 21, no 24, p. 29217-29222Article in journal (Refereed)
    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.

1 - 9 of 9
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