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Sökning: WFRF:(Pereira C) > RISE

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1.
  • Araujo, Leonardo F., et al. (författare)
  • Photonics with special optical fibers and nanoparticles
  • 2016
  • Ingår i: Optics InfoBase Conference Papers. - 9781943580163
  • Konferensbidrag (refereegranskat)abstract
    • 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.
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2.
  • Camara, Alexandre R., et al. (författare)
  • Optical creation and erasure of the linear electrooptical effect in silica fiber
  • 2015
  • Ingår i: Optics Express. - : Optical Society of America. - 1094-4087. ; 23:14, s. 18060-18069
  • Tidskriftsartikel (refereegranskat)abstract
    • 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 (similar to 10(8) V/m) is comparable to that obtained through classical thermal poling of fibers. In the regime studied here, the second-order nonlinearity induced (similar to 0.06 pm/V) is limited by the field applied during poling (1.2 x 10(8) 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. (C) 2015 Optical Society of America
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3.
  • Carvalho, Isabel C. S., et al. (författare)
  • Pockels fibers by optical poling
  • 2015
  • Ingår i: Workshop on Specialty Optical Fibers and their Applications 2015. - Washington, D.C. : OSA. - 9781943580057
  • Konferensbidrag (refereegranskat)abstract
    • 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.
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4.
  • Etcheverry, Sebastián, et al. (författare)
  • Microsecond switching of plasmonic nanorods in an all-fiber optofluidic component
  • 2017
  • Ingår i: Optica. - : Optical Society of America. - 2334-2536. ; 4:8, s. 864-870
  • Tidskriftsartikel (refereegranskat)abstract
    • 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.
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5.
  • Pereira, Joao, et al. (författare)
  • Fabry-Perot Cavity Optimization for Absolute Strain Sensing Using Finite Element Analysis
  • 2023
  • Ingår i: SENSORS. - : MDPI. ; 23:21
  • Tidskriftsartikel (refereegranskat)abstract
    • The finite element method (FEM) was used to investigate the optical-mechanical behavior of a Fabry-Perot Interferometer (FPI) composed of a capillary segment spliced between two sections of standard optical fiber. The developed FEM model was validated by comparing it with theory and with previously published experimental data. The model was then used to show that the absolute strain on the host substrate is usually smaller than the strain measurement obtained with the sensor. Finally, the FEM model was used to propose a cavity geometry that can be produced with repeatability and that yields the correct absolute strain experienced by the host substrate, without requiring previous strain calibration.
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  • Resultat 1-5 av 5

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