| 1. |
- Camara, A. R., et al.
(author)
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LSPR-based fiber optic sensing with chemically deposited Au nanoparticles
- 2010
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In: Latin America Optics and Photonics Conference (LAOP) 2010. - Washington, D.C. : OSA. - 9781557529039
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Conference paper (peer-reviewed)abstract
- A refractive index fiber optic sensor based on Localized Surface Plasmon Resonance (LSPR) and specular reflection from chemically deposited gold nanoparticles has been characterized, presenting a sensitivity of 38 nm/RIU.
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| 2. |
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| 3. |
- Canalias, Carlota, et al.
(author)
-
Backward quasi phase matched second harmonic generation in sub-micron periodically poled KTiOPO4
- 2005
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In: 2005 Conference on Lasers & Electro-Optics (CLEO), Vols 1-3. - WASHINGTON : OPTICAL SOC AMERICA. ; , s. 2264-2266
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Conference paper (peer-reviewed)abstract
- 1mm thick KTiOPO4 was poled with 720nm domain period by employing UV-lithography, chemical patterning and electric field poling. The structure was used to demonstrate 6 and 7 order quasi-phase matched backward second harmonic generation.
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| 4. |
- Canalias, Carlota, et al.
(author)
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Backward quasi-phase-matched second-harmonic generation in submicrometer periodically poled flux-grown KTiOPO4
- 2005
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In: Applied Physics Letters. - : AIP Publishing. - 0003-6951 .- 1077-3118. ; 86:18, s. 181105-1-181105-3
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Journal article (peer-reviewed)abstract
- A 1 turn thick flux-grown KTiOPO4 sample was poled with a 720 nm domain period by employing deep-UV laser lithography, chemical patterning, and electric field poling. An atomic force microscope was used to characterize the periodic domain structure. The sample was used to demonstrate sixth and seventh order quasi-phase-matched backward second-harmonic generation.
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| 5. |
- Canalias, Carlota, et al.
(author)
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Progress in Sub-Micrometer Periodicity of Quasi-Phase Matching Structures
- 2009
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In: 2009 Conference on Lasers and Electro-Optics and 2009 Conference on Quantum Electronics and Laser Science Conference, CLEO/QELS 2009. - Washington, D.C. : IEEE. - 9781424451845 ; , s. 906-907
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Conference paper (peer-reviewed)abstract
- We report on the progress in fabrication of sub-micrometer ferroelectric domain gratings in KTiOPO4. Periods as short as 565 nm have been created in the bulk of the crystal by electric-filed poling.
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| 6. |
- Chesini, Giancarlo, et al.
(author)
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All-fiber devices based on photonic crystal fibers with integrated electrodes
- 2009
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In: Optics Express. - 1094-4087. ; 17:3, s. 1660-1665
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Journal article (peer-reviewed)abstract
- A special kind of microstructured optical fiber is proposed and fabricated in which, in addition to the holey region (solid core and silica-air cladding), two large holes exist for electrode insertion. Either Bi-Sn or Au-Sn alloys were selectively inserted into the large holes forming two parallel, continuous and homogeneous internal electrodes. We demonstrate the production of a monolithic device and its use to externally control some of the guidance properties (e. g. polarization) of the fiber.
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| 7. |
- Claesson, Åsa, et al.
(author)
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UV-transparent coatings for optical fiber
- 1997
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Conference paper (peer-reviewed)abstract
- Bragg gratings have been produced in germanosilicate optical fibers by exposing the fiber, through a polymer coating, to an interference pattern in the ultraviolet wavelength region. Two different coatings, Teflon AF@ 1600 and Kynar@ 7201, were applied on the fiber by dip coating and their optical properties in the 200-300 nm range were investigated. During the grating fabrication process, Teflon AF showed no sign of degradation at the fluencies required for efficient grating manufacturing. When Kynar 7201 was used, the coating darkened and decomposed
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| 8. |
- Coucheron, David A., et al.
(author)
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Laser recrystallization and inscription of compositional microstructures in crystalline SiGe-core fibres
- 2016
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In: Nature Communications. - : Nature Publishing Group. - 2041-1723. ; 7
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Journal article (peer-reviewed)abstract
- Glass fibres with silicon cores have emerged as a versatile platform for all-optical processing, sensing and microscale optoelectronic devices. Using SiGe in the core extends the accessible wavelength range and potential optical functionality because the bandgap and optical properties can be tuned by changing the composition. However, silicon and germanium segregate unevenly during non-equilibrium solidification, presenting new fabrication challenges, and requiring detailed studies of the alloy crystallization dynamics in the fibre geometry. We report the fabrication of SiGe-core optical fibres, and the use of CO2 laser irradiation to heat the glass cladding and recrystallize the core, improving optical transmission. We observe the ramifications of the classic models of solidification at the microscale, and demonstrate suppression of constitutional undercooling at high solidification velocities. Tailoring the recrystallization conditions allows formation of long single crystals with uniform composition, as well as fabrication of compositional microstructures, such as gratings, within the fibre core.
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| 9. |
- de Oliveira, R., et al.
(author)
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Fabrication and Optical Characterization of Silica Optical Fibers Containing Gold Nanoparticles
- 2015
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In: ACS Applied Materials and Interfaces. - : American Chemical Society (ACS). - 1944-8244 .- 1944-8252. ; 7:1, s. 370-375
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Journal article (peer-reviewed)abstract
- 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) m(2) W(-1), represents an improvement of >50×.
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| 10. |
- dos Santos, F. Eroni P., et al.
(author)
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Evaluation of the third-order nonlinear optical properties of tellurite glasses by thermally managed eclipse Z-scan
- 2009
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In: Journal of Applied Physics. - : AIP Publishing. - 0021-8979 .- 1089-7550. ; 105:2
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Journal article (peer-reviewed)abstract
- The third-order nonlinearity is measured for TeO2-ZnO-Na2O (TZN) glasses codoped with BaO, Nb2O5, and La2O3. The results for the sign and magnitude of the nonlinearity were obtained using a combination of the eclipse Z-scan with thermal nonlinearity managed Z-scan, whereas the Kerr shutter technique was employed to obtain the electronic time response of the nonlinearity, all performed with 76 MHz repetition rate 150 fs pulses at 800 nm. The results show a fast response (< 200 fs) and a nonlinear refractive index varying from 1.5 to 3.5x10(-15) cm(2)/W, depending upon glass composition. At the peak power level employed, nonlinear absorption was negligible. The results obtained are in good agreement with other tellurite compositions reported, confirming the electronic origin of the nonlinearity.
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