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21 August 2009 Transmission, reflection, and absorption gratings in photorefractive polymers
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Two-beam coupling (TBC) in a photorefractive polymer using transmission and reflection geometries is investigated. With drift (due to an applied electric field) and diffusion, a linearized analysis suggests a phase shift between the intensity grating and the induced refractive index grating different from the ideal value of 90 degrees, which is supported by experimental results using a transmission grating geometry. In a self-pumped reflection grating geometry, which is also experimentally studied, the phase shift can be closer to 90 degrees due to a shorter grating period. Absorption and absorption gratings during TBC is also experimentally investigated.
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Partha P. Banerjee, Gary Cook, Dean R. Evans, J. Wofford, P.-A. Blanche, J. Thomas, and N. Peyghambarian "Transmission, reflection, and absorption gratings in photorefractive polymers", Proc. SPIE 7420, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications III, 74200H (21 August 2009);

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