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  • 1
    Electronic Resource
    Electronic Resource
    Anomalous refractive index change and recovery of electro-optic coefficient r33 in proton-exchanged LiTaO3 optical waveguides after annealing (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 3966-3974 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An increase of surface refractive index and a recovery of the r33 electro-optic coefficient have been observed for proton-exchanged LiTaO3 optical waveguides after annealing. On the basis of the results of nuclear reaction analysis, x-ray rocking curve analysis, and infrared-absorption spectroscopy, a qualitative model to explain these phenomena is proposed. The evolutions of the index profile and the r33 coefficient after proton exchange and annealing are considered to be caused by the movement of protons in the crystal lattice and the interdiffusion of protons and Li ions. The condition required for the fabrication of waveguides with good electro-optic performance is also shown.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350868
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    Paper (German National Licenses)
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  • 2
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    Effective and tunable light trapping in bulk heterojunction organic solar cells by employing Au-Ag alloy nanoparticles (2014)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2014-10-16
    Description: Effective and tunable light trapping in organic solar cells (OSCs) has been demonstrated by employing Au-Ag alloy nanoparticles (NPs). A simple vacuum thermal annealing method has been employed to fabricate the Au-Ag alloy NPs with tunable molar ratio, and thereafter tunable localized surface plasmon resonance (LSPR). The incorporation of the alloy NPs with an appropriate molar ratio into the OSCs structures supports amplification of the electric field near the particles surface through LSPR and results in an enhanced light absorption at the absorption wavelength region of the absorber owing to the near field coupling. The short-circuit photocurrent density of the alloy NPs-based OSCs is improved from 7.37 to 8.74 mA/cm 2 compared to that of control OSCs, and the efficiency of 3.03% is obtained, which corresponds to an enhancement factor of 19%.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 3
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    Plasmon resonance enhanced large third-order optical nonlinearity and ultrafast optical response in Au nanobipyramids (2014)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2014-08-12
    Description: The third-order optical nonlinearity and response time of Au nanobipyramids have been investigated by using optical Kerr effect technique. Large third-order nonlinear optical susceptibility ( χ (3) ) and ultrafast optical response time have been obtained at the longitudinal surface plasmon resonance (LSPR) wavelength. As the excitation laser wavelength varies from non-resonance wavelength of 780 nm to the LSPR wavelength of 825 nm, χ (3) increases from 7.4 × 10 −14 to 3.9 × 10 −13 esu, the fast component of the response time decreases from 141 ± 23 to 83 ± 8 fs and the ratio of the fast component remains around 48%, while the slow response time decreases from 3200 ± 200 to 2310 ± 158 fs. The large enhancement of χ (3) is due to the large local field enhancement caused by the surface plasmon resonance, and the shortening of the response times are induced by the increased probability of the electron-electron and electron-phonon scatterings in the nanosystem. This significant ultrafast optical property in Au nanobipyramids has great application in future ultrafast information processors.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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