Photorefractivity in Doped Nonlinear Organic Polymers
Interim technical rept.,
IBM ALMADEN RESEARCH CENTER SAN JOSE CA
Pagination or Media Count:
This paper describes the properties of a new class of materials exhibiting the photorefractive effect, doped nonlinear organic polymers. Photorefraction at 647.1 nm was established by a combination of hologram erasability, correlation with photoconductivity and electro-optic response, and enhancement by external fields in numerous samples of two nonlinear epoxy materials doped with hole transport agents based on p-diethylaminobenzaldehyde- diphenyl hydrazone DEH. Diffraction efficiencies up to 0.1 were observed at bias fields near 100 kVcm. A useful property of these materials is that poling of the nonlinear chromophores is partially reversible, permitting partial control of the grating readout independent of the space-charge field formed. The polarization anisotropy of grating readout is consistent with the photorefractive mechanism.
- Polymer Chemistry