The Experts below are selected from a list of 8307 Experts worldwide ranked by ideXlab platform
Bahram Jalali - One of the best experts on this subject based on the ideXlab platform.
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Nonlinear Photovoltaic Effect
LEOS 2007 - IEEE Lasers and Electro-Optics Society Annual Meeting Conference Proceedings, 2007Co-Authors: Sasan Fathpour, Kevin K. Tsia, Bahram JalaliAbstract:The theory of nonlinear Photovoltaic Effect is developed and compared with experiments. By harvesting the optical energy lost to two-photon absorption, this new Photovoltaic Effect offers an energy-efficient solution in nonlinear silicon photonics.
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Two-Photon Photovoltaic Effect in Silicon
IEEE Journal of Quantum Electronics, 2007Co-Authors: Sasan Fathpour, Kevin K. Tsia, Bahram JalaliAbstract:Optical amplification, wavelength conversion, and a myriad of other functions that were once considered to be beyond silicon's reach have been made possible by the material's nonlinear optical properties. The common feature of such devices is the high optical intensity that is required to induce the nonlinear optical interactions. Concurrent with the useful nonlinearities (Raman and Kerr) are two-photon absorption and free carrier scattering, which are two related and harmful phenomena that render silicon lossy at high intensities. This paper explores the use of the two-photon Photovoltaic Effect as a means to counter these phenomena in an energy-efficient manner. The Effect reduces losses due to free carrier scattering and serendipitously scavenges the optical energy lost to two-photon absorption. Analytical and numerical modeling of the two-photon Photovoltaic Effect in silicon devices is presented. The model is validated through comparison with experimental results and is used to establish the limits of this approach for creating energy-efficient silicon photonic devices.
Sasan Fathpour - One of the best experts on this subject based on the ideXlab platform.
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Two-photon Photovoltaic Effect in gallium arsenide
CLEO: 2014, 2014Co-Authors: Jeff Chiles, Y. D. Sharma, Sanjay Krishna, Sasan FathpourAbstract:The two-photon Photovoltaic Effect is demonstrated in gallium arsenide at 976 and 1550 nm wavelengths. A waveguide photodiode biased in its fourth quadrant is used to harvest electrical power from photons lost to two-photon absorption.
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Nonlinear Photovoltaic Effect
LEOS 2007 - IEEE Lasers and Electro-Optics Society Annual Meeting Conference Proceedings, 2007Co-Authors: Sasan Fathpour, Kevin K. Tsia, Bahram JalaliAbstract:The theory of nonlinear Photovoltaic Effect is developed and compared with experiments. By harvesting the optical energy lost to two-photon absorption, this new Photovoltaic Effect offers an energy-efficient solution in nonlinear silicon photonics.
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Two-Photon Photovoltaic Effect in Silicon
IEEE Journal of Quantum Electronics, 2007Co-Authors: Sasan Fathpour, Kevin K. Tsia, Bahram JalaliAbstract:Optical amplification, wavelength conversion, and a myriad of other functions that were once considered to be beyond silicon's reach have been made possible by the material's nonlinear optical properties. The common feature of such devices is the high optical intensity that is required to induce the nonlinear optical interactions. Concurrent with the useful nonlinearities (Raman and Kerr) are two-photon absorption and free carrier scattering, which are two related and harmful phenomena that render silicon lossy at high intensities. This paper explores the use of the two-photon Photovoltaic Effect as a means to counter these phenomena in an energy-efficient manner. The Effect reduces losses due to free carrier scattering and serendipitously scavenges the optical energy lost to two-photon absorption. Analytical and numerical modeling of the two-photon Photovoltaic Effect in silicon devices is presented. The model is validated through comparison with experimental results and is used to establish the limits of this approach for creating energy-efficient silicon photonic devices.
Jaime Frejlich - One of the best experts on this subject based on the ideXlab platform.
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Nonlinear Photovoltaic Effect in Sillenite photorefractive crystals
Optical Materials, 2017Co-Authors: Ivan De Oliveira, Danilo Augusto Capovilla, André L. Moura, Varese S. Timóteo, Jesiel F. Carvalho, Jaime FrejlichAbstract:Abstract We report on the presence of Photovoltaic Effect in some Sillenite photorefractive crystals and compare their behavior with that of the well known Photovoltaic LiNbO3:Fe crystal. Nonlinear Photovoltaic behavior of these Sillenites are also reported here for the first time and explained by the presence of shallow along with deep Photovoltaic centers.
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Photovoltaic Effect in bi2teo5 photorefractive crystal
Applied Physics Letters, 2015Co-Authors: Ivan De Oliveira, Danilo Augusto Capovilla, J F Carvalho, Renata Montenegro, Zanine V Fabris, Jaime FrejlichAbstract:We report on the presence of a strong Photovoltaic Effect on nominally undoped photorefractive Bi2TeO5 crystals and estimated their Glass Photovoltaic constant and Photovoltaic field for λ = 532 nm illumination. We directly measured the Photovoltaic-based photocurrent in this material under λ = 532 nm wavelength laser light illumination and compared its behavior with that of a well known Photovoltaic Fe-doped Lithium Niobate crystal. We also show the Photovoltaic current to strongly depend on the polarization direction of light. Holographic diffraction efficiency oscillation during recording and the behavior of fringe-locked running holograms in self-stabilized experiments are also demonstrated here as additional indirect proofs of the Photovoltaic nature of this material.
Pawan Tyagi - One of the best experts on this subject based on the ideXlab platform.
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Spin Photovoltaic Effect on Molecule Coupled Ferromagnetic Films of a Magnetic Tunnel Junction
Volume 6B: Energy, 2013Co-Authors: Pawan TyagiAbstract:Economical solar energy harvesting can be boosted by the discovery of fundamentally new Photovoltaic mechanism, and a suitable system to realize it with commonly available materials. One promising route is to focus on spin property of the electron, not charge, and develop spin Photovoltaic Effect with widely available ferromagnetic metals like iron and nickel. This paper reports the observation of Photovoltaic Effect on the molecular spintronics device composed of a magnetic tunnel junctions (MTJ) testbed and organometallic molecular clusters (OMCs). Our MSDs were produced by bridging the OMC channels between the ferromagnetic films of a prefabricated MTJ testbed with exposed side edges. The MTJ testbed exhibited OMC induced strong increase in exchange coupling and Photovoltaic Effect. Control experiments on isolated ferromagnetic films, same as utilized in the MTJ testbed, suggested that OMCs neither affected the magnetic properties nor produced any Photovoltaic Effect. Photovoltaic Effect was only observed on the pair of ferromagnetic films serving as magnetic electrodes in a MTJ. Our recent Monte Carlo simulations and multiple magnetic characterizations provide evidence that molecules induced strong coupling between two ferromagnetic films can dramatically alter the overall magnetic properties of a MTJ; presumably making an ordinary MTJ suitable for spin based Photovoltaic Effect. The Photovoltaic Effect on our molecular spintronics devices (MTJ+OMCs) was sensitive towards the external magnetic field and temperature. Present paper motivates further studies to understand the spin Photovoltaic Effect in molecular spintronics devices.Copyright © 2013 by ASME
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Photovoltaic Effect on Molecule Coupled Ferromagnetic Films of a Magnetic Tunnel Junction.
arXiv: Mesoscale and Nanoscale Physics, 2011Co-Authors: Pawan TyagiAbstract:Economical solar energy conversion to electricity can be boosted by the discovery of fundamentally new Photovoltaic mechanism, and a suitable system to realize it with commonly available materials like iron (Fe) and nickel (Ni). This paper reports the observation of Photovoltaic Effect on a molecular spintronics device, composed of magnetic tunnel junction (MTJ) and organometallic molecular clusters (OMCs). A prefabricated MTJ with exposed side edges, after enabling the bridging of OMC channels between its two ferromagnetic films, exhibited following phenomenon (i) dramatic increase in exchange coupling, (ii) 3-6 orders current suppression and (iii) Photovoltaic Effect. This paper focuses on the Photovoltaic Effect. Control experiments on isolated ferromagnetic films suggested that OMCs neither affected the magnetic properties nor produced any Photovoltaic Effect; Photovoltaic Effect was only observed on the ferromagnetic films serving as magnetic electrodes in a MTJ. Present paper invites further investigation of the similar Photovoltaic Effect on other combinations of MTJs and promising magnetic molecules, like single molecular magnets, organometallic clusters and porphyrins. This research can lead to mass producible and economical spin Photovoltaic devices.
Ivan De Oliveira - One of the best experts on this subject based on the ideXlab platform.
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Nonlinear Photovoltaic Effect in Sillenite photorefractive crystals
Optical Materials, 2017Co-Authors: Ivan De Oliveira, Danilo Augusto Capovilla, André L. Moura, Varese S. Timóteo, Jesiel F. Carvalho, Jaime FrejlichAbstract:Abstract We report on the presence of Photovoltaic Effect in some Sillenite photorefractive crystals and compare their behavior with that of the well known Photovoltaic LiNbO3:Fe crystal. Nonlinear Photovoltaic behavior of these Sillenites are also reported here for the first time and explained by the presence of shallow along with deep Photovoltaic centers.
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Photovoltaic Effect in bi2teo5 photorefractive crystal
Applied Physics Letters, 2015Co-Authors: Ivan De Oliveira, Danilo Augusto Capovilla, J F Carvalho, Renata Montenegro, Zanine V Fabris, Jaime FrejlichAbstract:We report on the presence of a strong Photovoltaic Effect on nominally undoped photorefractive Bi2TeO5 crystals and estimated their Glass Photovoltaic constant and Photovoltaic field for λ = 532 nm illumination. We directly measured the Photovoltaic-based photocurrent in this material under λ = 532 nm wavelength laser light illumination and compared its behavior with that of a well known Photovoltaic Fe-doped Lithium Niobate crystal. We also show the Photovoltaic current to strongly depend on the polarization direction of light. Holographic diffraction efficiency oscillation during recording and the behavior of fringe-locked running holograms in self-stabilized experiments are also demonstrated here as additional indirect proofs of the Photovoltaic nature of this material.
