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Organic photorefractive materials

About: Organic photorefractive materials is a research topic. Over the lifetime, 697 publications have been published within this topic receiving 13041 citations.


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Patent
06 Mar 2003
TL;DR: In this article, a method for treating photorefractive effect of an optical device, which comprises irradiating an optical devices comprising a lithium niobate single crystal or a lithium tantalate single-crystal with an ultraviolet light having a wavelength of at least 300 nm and at most 400 nm, was proposed.
Abstract: A method for treating a photorefractive effect of an optical device, which comprises irradiating an optical device comprising a lithium niobate single crystal or a lithium tantalate single crystal with an ultraviolet light having a wavelength of at least 300 nm and at most 400 nm so as to suppress and control a photo-induced refractive index change (photorefractive effect) caused on the device.

3 citations

Proceedings ArticleDOI
07 Sep 2011
TL;DR: In this paper, photoinduced redistribution of metal nanoparticles, placed on the surface of the Fe:LiNbO 3 (Fe:LN) was investigated during recording of dynamic holograms.
Abstract: We have investigated photoinduced redistribution of metal nanoparticles, placed on the surface of the ferroelectric photorefractive crystal during recording of dynamic holograms. Motivations for this study were improvement of sensitivity for recording of dynamic holographic gratings, for application in nondestructive testing of materials. The home- made biosynthesized gold and silver colloidal solutions were spread as a thin layer on the ferroelectric photorefractive crystal surface. Holographic gratings were recorded in photorefractive crystal of Fe:LiNbO 3 (Fe:LN) by the HeNe laser (λ=633nm) to avoid direct influence of laser light on nanoparticles. Photorefractive holographic grating initially recorded in the crystal volume produce spatially modulated electric field on the crystal surface. This field led to electrophoretic redistribution of the nanoparicles on the crystal surface that result also in additional contribution to the electric field pattern and also change diffraction efficiency of hologram. In addition, we have recorded holographic grating in Fe:LN placed in 5mm cuvette with silver nanoparticles nanofluid and observed nanoparticles distribution along grating line. We have calculated electrophoretic (EP) and dielectrophoretic (DEP) forces on the crystal surface with holographic photorefractive grating, recorded in the crystal. It is shown that longitudinal (along the crystal surface) components of the DEP-force can be described only with high-contrast approach.

3 citations

Book ChapterDOI
01 Jan 2016
TL;DR: In this paper, the role and influence of photoconductive properties in organic photorefractive materials on the photore-fractive performance are discussed, and the strategy for obtaining the better and the best photoreFractive performance, higher diffraction efficiency, and faster speed of the grating formation of the corresponding materials is discussed from the point of view of the photoconductivity.
Abstract: Photorefractive phenomenon is based on the refractive index modulation due to the redistribution of charge carriers generated upon the illumination of the interference of laser beams in the materials possessing both photoconductivity and optical nonlinearity. Photogeneration of charge carriers in the bright regions of the interferencing beams initiates the photorefractive phenomenon. Thus the photogeneration of charge carrier upon photoexcitation is first step for the photorefractive phenomenon. Through several photophysical processes, positive and negative charge carriers are periodically distributed to form the refractive index modulation via the first-order electro-optics effect of the Pockels effect. In this chapter, the role and the influence of photoconductive properties in organic photorefractive materials on the photorefractive performance are discussed, and the strategy for obtaining the better and the best photorefractive performance, higher diffraction efficiency, and faster speed of the grating formation of the corresponding materials is discussed from the point of view of the photoconductivity.

3 citations

Journal ArticleDOI
TL;DR: In this paper, a nonlinear wave equation for a signal beam coupled to a pump beam by two-wave mixing in a photorefractive crystal was derived to describe self-focusing of the signal beam.
Abstract: We derive a nonlinear wave equation for a signal beam which is coupled to a pump beam by two-wave-mixing in a photorefractive crystal. This equation describes self-focusing of the signal beam. We compare two-wave-mixing induced spatial self-focusing of single-pass experiments in a diffusion-type photorefractive crystal and of a photorefractive oscillator using the same crystal. We observe that the nonlinear refractive index change in the oscillator is decreased while increasing resonator losses.

3 citations

Journal ArticleDOI
TL;DR: The photorefractive effect in ferroelectric crystals is well known to be due to the formation of a local internal field which gives rise to the refractive index change via linear electrooptic effect.
Abstract: The photorefractive effect in ferroelectric crystals is well known to be due to the formation of a local internal field which gives rise to the refractive index change via linear electrooptic effect.1,2 In LiNbO3 the most important role in formation of the internal field has been shown to be played by the bulk photovoltaic effect.3,4 However such mechanism appears is not the only one possible. In other cases the internal field is supposed to originate in screening.1,5

3 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20231
20211
20201
20181
20172
20165