The Experts below are selected from a list of 15 Experts worldwide ranked by ideXlab platform

Nashwan Younis - One of the best experts on this subject based on the ideXlab platform.

  • New optical method for determining Poisson’s ratio/Young’s modulus for transparent Materials
    Optical Engineering, 2002
    Co-Authors: Nashwan Younis
    Abstract:

    In this study, an optical method is developed for the determination of the mechanical properties of polymers. The proposed method utilized the transmitted and reflected caustics. Thus, it can be used in a typical optical stress analysis laboratory. The mechanical properties of an Optically Isotropic Material are determined using thin specimens with a central hole that are loaded in tension. The diffraction effects were considered using a digital image-analysis system. The effect of the hole size on the determination of the mechanical property is investigated. Excellent results were obtained using the proposed method.

Irina Veretennicoff - One of the best experts on this subject based on the ideXlab platform.

  • Polarization-induced switching and polarization bistability in nonlinear planar resonators with diffusive nonlinearity
    Photonic Switching, 1993
    Co-Authors: Jan Danckaert, Hugo Thienpont, Irina Veretennicoff
    Abstract:

    To merge the fields of polarization and nonlinear optics opens wide perspectives. The present work aims at investigating some of them. It is shown, on one hand, that if a nonlinear Fabry- Perot resonator filled with an Optically Isotropic Material is addressed by an obliquely incident beam, the transmitted irradiance can switch from an up to a down state (or the reverse) if its polarization is properly modulated. If on the other hand the nonlinear cavity is filled with a linearly birefringent Material, polarization optical bistability can occur, even at normal incidence. This polarization bistability can arise both by modulating the incident irradiance and by modulating the incident polarization. Optical bistability of the transmitted irradiance can also be induced by the modulation of the polarization of the incident beam. All these features provide new tools for parallel digital optical information processing.

Jan Danckaert - One of the best experts on this subject based on the ideXlab platform.

  • Polarization-induced switching and polarization bistability in nonlinear planar resonators with diffusive nonlinearity
    Photonic Switching, 1993
    Co-Authors: Jan Danckaert, Hugo Thienpont, Irina Veretennicoff
    Abstract:

    To merge the fields of polarization and nonlinear optics opens wide perspectives. The present work aims at investigating some of them. It is shown, on one hand, that if a nonlinear Fabry- Perot resonator filled with an Optically Isotropic Material is addressed by an obliquely incident beam, the transmitted irradiance can switch from an up to a down state (or the reverse) if its polarization is properly modulated. If on the other hand the nonlinear cavity is filled with a linearly birefringent Material, polarization optical bistability can occur, even at normal incidence. This polarization bistability can arise both by modulating the incident irradiance and by modulating the incident polarization. Optical bistability of the transmitted irradiance can also be induced by the modulation of the polarization of the incident beam. All these features provide new tools for parallel digital optical information processing.

Hugo Thienpont - One of the best experts on this subject based on the ideXlab platform.

  • Polarization-induced switching and polarization bistability in nonlinear planar resonators with diffusive nonlinearity
    Photonic Switching, 1993
    Co-Authors: Jan Danckaert, Hugo Thienpont, Irina Veretennicoff
    Abstract:

    To merge the fields of polarization and nonlinear optics opens wide perspectives. The present work aims at investigating some of them. It is shown, on one hand, that if a nonlinear Fabry- Perot resonator filled with an Optically Isotropic Material is addressed by an obliquely incident beam, the transmitted irradiance can switch from an up to a down state (or the reverse) if its polarization is properly modulated. If on the other hand the nonlinear cavity is filled with a linearly birefringent Material, polarization optical bistability can occur, even at normal incidence. This polarization bistability can arise both by modulating the incident irradiance and by modulating the incident polarization. Optical bistability of the transmitted irradiance can also be induced by the modulation of the polarization of the incident beam. All these features provide new tools for parallel digital optical information processing.

D.m. Hoat - One of the best experts on this subject based on the ideXlab platform.

  • Theoretical study of electronic and optical properties of antiferromagnetic β-MnS using the modified Becke Johnson (mBJ) potential
    Journal of Physics and Chemistry of Solids, 2017
    Co-Authors: J.f. Rivas Silva, A. Méndez Blas, D.m. Hoat
    Abstract:

    Abstract We have investigated the electronic and optical properties of β-MnS with III-type antiferromagnetic ordering using full potential linearized augmented plane wave (FP-LAPW) method within the framework of the spin-polarized density functional theory as implemented in WIEN2k package. Firstly, it is proven that III-type antiferromagnetic ordering is stable in comparison with others from the total energy calculated using the Perdew-Burke-Ernzerhof (PBE) functional. Then, we study the electronic properties of β-MnS for an energy range from −5 eV to 5 eV using mBJ exchange and PBE semilocal correlation, our calculations show an indirect energy band gap of 2.275 eV and the strong hybridization of Mn-3d states and S-3p state in valence band. Additionally, we also investigate the effect of spin-orbit coupling on the electronic properties, this causes a very slight red-shift in both Mn-3d and S-3p states but no change of energy gap is observed. Finally, the linear optical properties such as absortion coefficient, reflectivity, energy loss function, refractive index, extinction coefficient and optical conductivity have been derived from calculated complex dielectric function for energy from 0 eV to 24 eV considering all the three polarization directions (E//x, E//y and E//z). The obtained results indicate that β-MnS is an Optically Isotropic Material when the energy is small and it becomes anIsotropic for high energy.