The Experts below are selected from a list of 54 Experts worldwide ranked by ideXlab platform

Norifumi Fujimura - One of the best experts on this subject based on the ideXlab platform.

  • Electro-optic effect in ZnO:Mn thin films
    Journal of Alloys and Compounds, 2004
    Co-Authors: Takahiro Nagata, Atsushi Ashida, Norifumi Fujimura
    Abstract:

    The electro-optic effect of ZnO epitaxial films was studied. Since the electro-optic effect in ZnO is inferior to that of ferroelectric materials, an increase in the electro-optic effect was expected in ZnO having ferroelectricity, due to the increase in the dielectric constant. Although Li and Mg doped ZnO film exhibited electro-optic response, the mobile Li ions influenced the polarization behaviour. To eliminate the electro-optic effect induced by other space charge effects, the birefringence shift measurement was performed. The measurement with ac electric field at various frequencies could abstract the electro-optic effect of Mn-doped ZnO thin films induced only by Dipolar Polarizability.

  • Electro-Optic Effect in Epitaxial ZnO:Mn Thin Films
    Japanese Journal of Applied Physics, 2002
    Co-Authors: Takahiro Nagata, Atsushi Ashida, Norifumi Fujimura
    Abstract:

    We have studied the electro-optic effect of ZnO films. The use of ZnO which exhibits ferroelectricity with Li doping is believed to be one of the solutions for enhancing the electro-optic effect. In this paper, the birefringence shift measurement was performed for nondoped ZnO and Mn-doped ZnO films as the first step for evaluating the electro-optic effect of ZnO:Li film. Nondoped ZnO film exhibited poor dielectric property and no electro-optic response has been observed due to its large leakage current. Mn doping to ZnO led to a significant improvement of the large leakage current problem. The sample showed a linear electro-optic response, and we succeeded in measuring the electro-optic effect induced by Dipolar Polarizability at the ac bias voltage frequency above 10 kHz. Below this frequency, the electro-optic response includes the space charge effect.

Takahiro Nagata - One of the best experts on this subject based on the ideXlab platform.

  • Electro-optic effect in ZnO:Mn thin films
    Journal of Alloys and Compounds, 2004
    Co-Authors: Takahiro Nagata, Atsushi Ashida, Norifumi Fujimura
    Abstract:

    The electro-optic effect of ZnO epitaxial films was studied. Since the electro-optic effect in ZnO is inferior to that of ferroelectric materials, an increase in the electro-optic effect was expected in ZnO having ferroelectricity, due to the increase in the dielectric constant. Although Li and Mg doped ZnO film exhibited electro-optic response, the mobile Li ions influenced the polarization behaviour. To eliminate the electro-optic effect induced by other space charge effects, the birefringence shift measurement was performed. The measurement with ac electric field at various frequencies could abstract the electro-optic effect of Mn-doped ZnO thin films induced only by Dipolar Polarizability.

  • Electro-Optic Effect in Epitaxial ZnO:Mn Thin Films
    Japanese Journal of Applied Physics, 2002
    Co-Authors: Takahiro Nagata, Atsushi Ashida, Norifumi Fujimura
    Abstract:

    We have studied the electro-optic effect of ZnO films. The use of ZnO which exhibits ferroelectricity with Li doping is believed to be one of the solutions for enhancing the electro-optic effect. In this paper, the birefringence shift measurement was performed for nondoped ZnO and Mn-doped ZnO films as the first step for evaluating the electro-optic effect of ZnO:Li film. Nondoped ZnO film exhibited poor dielectric property and no electro-optic response has been observed due to its large leakage current. Mn doping to ZnO led to a significant improvement of the large leakage current problem. The sample showed a linear electro-optic response, and we succeeded in measuring the electro-optic effect induced by Dipolar Polarizability at the ac bias voltage frequency above 10 kHz. Below this frequency, the electro-optic response includes the space charge effect.

Atsushi Ashida - One of the best experts on this subject based on the ideXlab platform.

  • Electro-optic effect in ZnO:Mn thin films
    Journal of Alloys and Compounds, 2004
    Co-Authors: Takahiro Nagata, Atsushi Ashida, Norifumi Fujimura
    Abstract:

    The electro-optic effect of ZnO epitaxial films was studied. Since the electro-optic effect in ZnO is inferior to that of ferroelectric materials, an increase in the electro-optic effect was expected in ZnO having ferroelectricity, due to the increase in the dielectric constant. Although Li and Mg doped ZnO film exhibited electro-optic response, the mobile Li ions influenced the polarization behaviour. To eliminate the electro-optic effect induced by other space charge effects, the birefringence shift measurement was performed. The measurement with ac electric field at various frequencies could abstract the electro-optic effect of Mn-doped ZnO thin films induced only by Dipolar Polarizability.

  • Electro-Optic Effect in Epitaxial ZnO:Mn Thin Films
    Japanese Journal of Applied Physics, 2002
    Co-Authors: Takahiro Nagata, Atsushi Ashida, Norifumi Fujimura
    Abstract:

    We have studied the electro-optic effect of ZnO films. The use of ZnO which exhibits ferroelectricity with Li doping is believed to be one of the solutions for enhancing the electro-optic effect. In this paper, the birefringence shift measurement was performed for nondoped ZnO and Mn-doped ZnO films as the first step for evaluating the electro-optic effect of ZnO:Li film. Nondoped ZnO film exhibited poor dielectric property and no electro-optic response has been observed due to its large leakage current. Mn doping to ZnO led to a significant improvement of the large leakage current problem. The sample showed a linear electro-optic response, and we succeeded in measuring the electro-optic effect induced by Dipolar Polarizability at the ac bias voltage frequency above 10 kHz. Below this frequency, the electro-optic response includes the space charge effect.

Jacques Reisse - One of the best experts on this subject based on the ideXlab platform.

  • Molecular polarization and molecular chiralization: The first example of a chiralized xenon atom.
    Chirality, 2000
    Co-Authors: Kristin Bartik, Michel Luhmer, André Collet, Jacques Reisse
    Abstract:

    In this article we focus on the interaction between a chiral molecule and a single achiral molecule or an ensemble of achiral molecules. The desymmetrization of the achiral molecules resulting from this interaction is described as "chiralization." By analogy with electric polarization, we factorize chiralization into three factors, i.e., orientation, atomic, and electronic terms. Chiralization depends on the Dipolar Polarizability of the chiralized molecule but also on polarizabilities of higher order. The experimental part of this work is devoted to the electronic chiralization of a xenon atom and its observation by (129)Xe NMR spectroscopy. Copyright 2000 Wiley-Liss, Inc.

Tomasz J. Antosiewicz - One of the best experts on this subject based on the ideXlab platform.

  • Effective Dipolar Polarizability of amorphous arrays of size-dispersed nanoparticles.
    Optics letters, 2020
    Co-Authors: Krzysztof M. Czajkowski, Tomasz J. Antosiewicz
    Abstract:

    Inhomogeneity of nanoparticle size, shape, and distribution is ubiquitous and inherent in fabricated arrays or may be a deliberate attempt to engineer the optical response. It leads to a spread of polarizabilities of interacting elements and phases of scattered light, and quantitative understanding of these effects is important. Focusing on random/amorphous arrays of optical antennas, we combine T-matrix calculations and an analytical approach based on an effective Dipolar Polarizability within a film of dipoles framework to quantify the spectral response as a function of the particle inhomogeneity and stochastic clustering. The interplay of position-dependent stochastic coupling and size distribution of antennas determines the optical properties of such arrays as a function of mean/standard deviation of diameter and minimum separation. The resonance wavelength, amplitude, and scattering-to-absorption ratio exhibit oscillations around their size-averaged values with periods and amplitudes given by average structural factors.