High-gain photorefractive reflection gratings in layered photoconductive polymers

Kwon, O-Pil; Montemezzani, Germano; Günter, Peter; Lee, Suck-Hyun
January 2004
Applied Physics Letters;1/5/2004, Vol. 84 Issue 1, p43
Academic Journal
Large two-wave mixing gain in reflection grating geometry is obtained in layered organic photorefractive polymers doped with the chromophore piperidinodicyanostyrene. With an applied field of 60 V/μm and for a grating spacing of 0.205 μm, one measures a two-wave mixing gain coefficient of 104 cm[sup -1] and a diffraction efficiency of 4.8% in 100-μm-thick samples. Our photorefractive and electrochemical investigations suggest that the excellent material performance in reflection grating geometry is associated with an increased effective number of trapping sites. © 2004 American Institute of Physics.


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