The Experts below are selected from a list of 135 Experts worldwide ranked by ideXlab platform

Luis A Gomezmalagon - One of the best experts on this subject based on the ideXlab platform.

  • resonant third order nonlinear optical susceptibility of gold nanoparticles
    Journal of The Optical Society of America B-optical Physics, 2012
    Co-Authors: Joao B Monteirofilho, Luis A Gomezmalagon
    Abstract:

    Nonlinear third order optical susceptibilities of metal/dielectric composites containing gold nanoparticles were investigated numerically around the plasmon resonance using the degenerate electron gas model. Influence of the nanoparticle size and intensity of the incident light in the real and imaginary part of the susceptibility, local Field Factor, absorption spectra, and dispersion curves was analyzed. Results are in agreement with the available data in the literature.

Joao B Monteirofilho - One of the best experts on this subject based on the ideXlab platform.

  • resonant third order nonlinear optical susceptibility of gold nanoparticles
    Journal of The Optical Society of America B-optical Physics, 2012
    Co-Authors: Joao B Monteirofilho, Luis A Gomezmalagon
    Abstract:

    Nonlinear third order optical susceptibilities of metal/dielectric composites containing gold nanoparticles were investigated numerically around the plasmon resonance using the degenerate electron gas model. Influence of the nanoparticle size and intensity of the incident light in the real and imaginary part of the susceptibility, local Field Factor, absorption spectra, and dispersion curves was analyzed. Results are in agreement with the available data in the literature.

Manthos G Papadopoulos - One of the best experts on this subject based on the ideXlab platform.

  • computer simulation of the linear and nonlinear optical properties of liquid benzene its local Fields refractive index and second nonlinear susceptibility
    Journal of Chemical Physics, 1999
    Co-Authors: Rhc Rob Janssen, Jm Bomont, Doros N Theodorou, S G Raptis, Manthos G Papadopoulos
    Abstract:

    Molecular dynamics (MD) simulation and subsequent analysis of the macroscopic polarization developed in response to “a posteriori” applied electric Fields or of spontaneous fluctuations in the instantaneous polarization under zero applied Field is used to assess the nonlinear optical properties of a polarizable liquid. Three strategies are proposed for the electrostatic analysis, all using as input static “gas phase” (hyper)polarizabilities, obtained from ab initio calculations. All three strategies are shown to accurately reproduce the experimentally measured refractive index and second nonlinear susceptibility of liquid benzene. The simulation also predicts the distribution of orientations and magnitudes of the local electric Fields experienced by the molecules in the liquid, and the nonlinear contributions to the local Fields. This approach gives an 8% higher estimate of the second nonlinear susceptibility of liquid benzene than the Lorentz local Field Factor approach, in better agreement with experime...

S W Yu - One of the best experts on this subject based on the ideXlab platform.

  • au tio2 sio2 sandwich multilayer composite films with large nonlinear optical susceptibility
    Optical Materials, 2005
    Co-Authors: S W Yu, H B Liao, G K L Wong
    Abstract:

    Abstract Au/TiO 2 /SiO 2 sandwich composite multilayer films were deposited by alternating multitarget magnetron sputtering technique. Annealing process was performed for as-growth. Au particles appeared between the layers and grew with the increasing of the annealing temperature. The surface plasmon resonance of the annealed films is around 570–590 nm. The third-order nonlinear susceptibility was measured with the backward degenerate four wave mixing (DFWM) scheme at a 532 nm wavelength. The calculated values of χ (3) at 532 nm of the composite films are larger than 1.02 × 10 −6  esu. We assume the multilayer sandwich topology of the Au/TiO 2 /SiO 2 composite films has greatly enhanced the local Field Factor f and caused a larger χ (3) which is even not measured at the wavelength near the surface plasmon resonance of the composite materials.

Arao Nakamura - One of the best experts on this subject based on the ideXlab platform.

  • optical nonlinearities of a high concentration of small metal particles dispersed in glass copper and silver particles
    Journal of The Optical Society of America B-optical Physics, 1994
    Co-Authors: K Uchida, S Kaneko, Shigeaki Omi, C Hata, Hiroaki Tanji, Y Asahara, A J Ikushima, T Tokizaki, Arao Nakamura
    Abstract:

    Third-order nonlinearities of glasses doped with a large number of copper or silver particles are studied by degenerate four-wave mixing with an emphasis on particle-size dependence. The nonlinear susceptibility χ(3) exhibits a peak at the wavelength of the absorption peak, with a maximum value of the order of 10−7 esu. The value of χ(3)/α is roughly independent of the absorption coefficient α and increases as the particle radius increases. This result is well explained by the size dependence of the imaginary part of the dielectric constant of metal particles and the local-Field Factor. The time response of the nonlinearity exhibits two-component behavior: the fast decay time is shorter than the pulse width of the laser (~12 ps), whereas the slow one is 120–200 ps, being weakly dependent on the radius.