The Experts below are selected from a list of 42678 Experts worldwide ranked by ideXlab platform

Yuri S Kivshar - One of the best experts on this subject based on the ideXlab platform.

  • all optical switching and multistability in photonic structures with liquid Crystal Defects
    Applied Physics Letters, 2008
    Co-Authors: Andrey E Miroshnichenko, Etienne Brasselet, Yuri S Kivshar
    Abstract:

    We demonstrate that one-dimensional photonic Crystals with pure nematic liquid-Crystal Defects can operate as all-optical switching devices based on optical orientational nonlinearities of liquid Crystals. We show that such a periodic structure is responsible for a modulated threshold of the optical Freedericksz transition in the spectral domain, and this leads to all-optical switching and light-induced multistability. This effect has no quasistatics electric field analog, and it results from nonlinear coupling between light and a defect mode. © 2008 American Institute of Physics. DOI: 10.1063/1.2949076

  • All-optical switching and multistability in photonic structures with liquid Crystal Defects
    Applied Physics Letters, 2008
    Co-Authors: Andrey E Miroshnichenko, Yuri S Kivshar, Etienne Brasselet
    Abstract:

    We demonstrate that one-dimensional photonic Crystals with pure nematic liquid-Crystal Defects can operate as all-optical switching devices based on optical orientational nonlinearities of liquid Crystals. We show that such a periodic structure is responsible for a modulated threshold of the optical Fréedericksz transition in the spectral domain, and this leads to all-optical switching and light-induced multistability. This effect has no quasi-statics electric field analogue, and it results from nonlinear coupling between light and a defect mode.

  • all optical switching and multistability in photonic structures with liquid Crystal Defects
    arXiv: Soft Condensed Matter, 2007
    Co-Authors: Andrey E Miroshnichenko, Etienne Brasselet, Yuri S Kivshar
    Abstract:

    We demonstrate that one-dimensional photonic Crystals with pure nematic liquid-Crystal Defects can operate as all-optical switching devices based on optical orientational nonlinearities of liquid Crystals. We show that such a periodic structure is responsible for a modulated threshold of the optical Fr\'eedericksz transition in the spectral domain, and this leads to all-optical switching and light-induced multistability. This effect has no quasi-statics electric field analogue, and it results from nonlinear coupling between light and a defect mode.

  • tunable all optical switching in periodic structures with liquid Crystal Defects
    arXiv: Optics, 2006
    Co-Authors: Andrey E Miroshnichenko, Igor Pinkevych, Yuri S Kivshar
    Abstract:

    We suggest that tunable orientational nonlinearity of nematic liquid Crystals can be employed for all-optical switching in periodic photonic structures with liquid-Crystal Defects. We consider a one-dimensional periodic structure of Si layers with a local defect created by infiltrating a liquid Crystal into a pore, and demonstrate, by solving numerically a system of coupled nonlinear equations for the nematic director and the propagating electric field, that the light-induced Freedericksz transition can lead to a sharp switching and diode operation in the photonic devices.

Giso Hahn - One of the best experts on this subject based on the ideXlab platform.

  • Crystal Defects and their impact on ribbon growth on substrate (RGS) silicon solar cells
    Solar Energy Materials and Solar Cells, 2013
    Co-Authors: Uwe Hess, Pierre-yves Pichon, Sven Seren, Axel Schönecker, Giso Hahn
    Abstract:

    Abstract Ribbon Growth on Substrate (RGS) silicon wafers are casted directly from the silicon melt onto reusable substrates. Material losses by wafer sawing are omitted and high production speeds can be achieved. However, multiCrystalline RGS silicon as it is produced today incorporates high densities of Crystal Defects and impurities limiting the efficiency of the corresponding solar cells. The local impact of Crystal Defects on material quality is estimated via models developed by Donolato and Micard et al.. By theoretically negating the impact of grain boundaries and dislocations, charge carrier diffusion lengths are still limited to values

Christian Hagendorf - One of the best experts on this subject based on the ideXlab platform.

  • sodium decoration of pid s Crystal Defects after corona induced degradation of bare silicon solar cells
    Energy Procedia, 2015
    Co-Authors: Volker Naumann, Dominik Lausch, Christian Hagendorf
    Abstract:

    Abstract It is proven that potential-induced degradation leading to shunting of Crystalline silicon solar cells (PID-s) is caused by stacking fault-like planar Crystal Defects penetrating the p-n junction that become decorated with sodium due to high electric fields across the dielectric antireflective coating (ARC). Often it is assumed that sodium found in PID-s affected cells originates from the cover glass used for photovoltaic modules. In this contribution, we show that PID-s also occurs at bare silicon solar cells without polymer foil or glass encapsulation. Using corona discharge induced degradation, it is shown that sodium decorated, shuntingCrystal Defectsare generated. This sodium likely originates from contaminations present on the solar cell surface. Therefore, it is concluded that PID-s of solar modules also mainlyarises from sodium contaminationsof the solar cell surfaceand not from the glass. Whether PID-s occurs or not depends on the electric field across the ARC, influenced by theelectrical resistance of polymer foil and glass. So called sodium-free glass results in a low electric field due to the high resistance of the glass.

Andrey E Miroshnichenko - One of the best experts on this subject based on the ideXlab platform.

  • all optical switching and multistability in photonic structures with liquid Crystal Defects
    Applied Physics Letters, 2008
    Co-Authors: Andrey E Miroshnichenko, Etienne Brasselet, Yuri S Kivshar
    Abstract:

    We demonstrate that one-dimensional photonic Crystals with pure nematic liquid-Crystal Defects can operate as all-optical switching devices based on optical orientational nonlinearities of liquid Crystals. We show that such a periodic structure is responsible for a modulated threshold of the optical Freedericksz transition in the spectral domain, and this leads to all-optical switching and light-induced multistability. This effect has no quasistatics electric field analog, and it results from nonlinear coupling between light and a defect mode. © 2008 American Institute of Physics. DOI: 10.1063/1.2949076

  • All-optical switching and multistability in photonic structures with liquid Crystal Defects
    Applied Physics Letters, 2008
    Co-Authors: Andrey E Miroshnichenko, Yuri S Kivshar, Etienne Brasselet
    Abstract:

    We demonstrate that one-dimensional photonic Crystals with pure nematic liquid-Crystal Defects can operate as all-optical switching devices based on optical orientational nonlinearities of liquid Crystals. We show that such a periodic structure is responsible for a modulated threshold of the optical Fréedericksz transition in the spectral domain, and this leads to all-optical switching and light-induced multistability. This effect has no quasi-statics electric field analogue, and it results from nonlinear coupling between light and a defect mode.

  • all optical switching and multistability in photonic structures with liquid Crystal Defects
    arXiv: Soft Condensed Matter, 2007
    Co-Authors: Andrey E Miroshnichenko, Etienne Brasselet, Yuri S Kivshar
    Abstract:

    We demonstrate that one-dimensional photonic Crystals with pure nematic liquid-Crystal Defects can operate as all-optical switching devices based on optical orientational nonlinearities of liquid Crystals. We show that such a periodic structure is responsible for a modulated threshold of the optical Fr\'eedericksz transition in the spectral domain, and this leads to all-optical switching and light-induced multistability. This effect has no quasi-statics electric field analogue, and it results from nonlinear coupling between light and a defect mode.

  • tunable all optical switching in periodic structures with liquid Crystal Defects
    arXiv: Optics, 2006
    Co-Authors: Andrey E Miroshnichenko, Igor Pinkevych, Yuri S Kivshar
    Abstract:

    We suggest that tunable orientational nonlinearity of nematic liquid Crystals can be employed for all-optical switching in periodic photonic structures with liquid-Crystal Defects. We consider a one-dimensional periodic structure of Si layers with a local defect created by infiltrating a liquid Crystal into a pore, and demonstrate, by solving numerically a system of coupled nonlinear equations for the nematic director and the propagating electric field, that the light-induced Freedericksz transition can lead to a sharp switching and diode operation in the photonic devices.

Etienne Brasselet - One of the best experts on this subject based on the ideXlab platform.

  • all optical switching and multistability in photonic structures with liquid Crystal Defects
    Applied Physics Letters, 2008
    Co-Authors: Andrey E Miroshnichenko, Etienne Brasselet, Yuri S Kivshar
    Abstract:

    We demonstrate that one-dimensional photonic Crystals with pure nematic liquid-Crystal Defects can operate as all-optical switching devices based on optical orientational nonlinearities of liquid Crystals. We show that such a periodic structure is responsible for a modulated threshold of the optical Freedericksz transition in the spectral domain, and this leads to all-optical switching and light-induced multistability. This effect has no quasistatics electric field analog, and it results from nonlinear coupling between light and a defect mode. © 2008 American Institute of Physics. DOI: 10.1063/1.2949076

  • All-optical switching and multistability in photonic structures with liquid Crystal Defects
    Applied Physics Letters, 2008
    Co-Authors: Andrey E Miroshnichenko, Yuri S Kivshar, Etienne Brasselet
    Abstract:

    We demonstrate that one-dimensional photonic Crystals with pure nematic liquid-Crystal Defects can operate as all-optical switching devices based on optical orientational nonlinearities of liquid Crystals. We show that such a periodic structure is responsible for a modulated threshold of the optical Fréedericksz transition in the spectral domain, and this leads to all-optical switching and light-induced multistability. This effect has no quasi-statics electric field analogue, and it results from nonlinear coupling between light and a defect mode.

  • all optical switching and multistability in photonic structures with liquid Crystal Defects
    arXiv: Soft Condensed Matter, 2007
    Co-Authors: Andrey E Miroshnichenko, Etienne Brasselet, Yuri S Kivshar
    Abstract:

    We demonstrate that one-dimensional photonic Crystals with pure nematic liquid-Crystal Defects can operate as all-optical switching devices based on optical orientational nonlinearities of liquid Crystals. We show that such a periodic structure is responsible for a modulated threshold of the optical Fr\'eedericksz transition in the spectral domain, and this leads to all-optical switching and light-induced multistability. This effect has no quasi-statics electric field analogue, and it results from nonlinear coupling between light and a defect mode.