Space-charge field in polymeric photorefractive material

Won-Jae Joo; Nakjoong Kim

doi:10.1117/12.509592

8 December 2003 Space-charge field in polymeric photorefractive material

Won-Jae Joo, Nakjoong Kim

Proceedings Volume 5216, Organic Holographic Materials and Applications; (2003) https://doi.org/10.1117/12.509592
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

Abstract

We proposed a method for measuring the magnitude of the space-charge field of the polymeric photorefractive materials. In the case of polymeric photorefractive material with low glass transition temperature, optically anisotropic chromophores are known to be reoriented under space-charge field. Simply by adding a pair of crossed polarizers unit to a conventional degenerated four wave mixing setup, we could measure the birefringence of the photorefractive materials induced by a newly formed space-charge field. Since the birefringence of a given material is governed by the applied electric field, the space-charge field can be determined from the variation of birefringence using the oriented gas model. We investigated the dependence of the grating formation on temperature in photorefractive polymeric composite, especially the index contrast of the grating. The diffraction efficiency of the photorefractive polymeric composite decreased with increasing the temperature, and it could be explained with the magnitude of space-charge field and the electro-optic behavior at various temperatures.

Citation Download Citation

Won-Jae Joo and Nakjoong Kim "Space-charge field in polymeric photorefractive material", Proc. SPIE 5216, Organic Holographic Materials and Applications, (8 December 2003); https://doi.org/10.1117/12.509592

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