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Proceedings Paper

Fabrication of refractive index grating into an azo-dye-attached EO polymer film by photobleaching
Author(s): Toshiaki Hattori; Tomoaki Shibata; Shinji Onodera; Toshikuni Kaino
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Paper Abstract

Highly efficient refractive index gratings, 35 percent or more, were fabricated by photobleaching into an azo polymer film with a large second-order optical nonlinearity. From IR spectroscopy, it was confirmed that 532 nm laser light cause photobleaching of azo polymer film effectively. As the modulation depth of relief structure observed by AFM was less than 30 nm, the effect of relief structure observed by AFM was less than 30 nm, the effect of relief structure on the diffraction efficiency is negligible. From these results, we confirmed that the grating obtained in this experiment was mainly caused by photobleaching. We observed that coupling efficiency of the grating is dependent on polarization direction of guiding beam. This is considered to related to the anisotropic refractive index change due to the photobleaching in vertical plane of film.

Paper Details

Date Published: 11 October 1999
PDF: 8 pages
Proc. SPIE 3796, Organic Nonlinear Optical Materials, (11 October 1999); doi: 10.1117/12.368290
Show Author Affiliations
Toshiaki Hattori, Tohoku Univ. and Mitsubishi Rayon Co., Ltd. (Japan)
Tomoaki Shibata, Tohoku Univ. (Japan)
Shinji Onodera, Tohoku Univ. (Japan)
Toshikuni Kaino, Tohoku Univ. (Japan)

Published in SPIE Proceedings Vol. 3796:
Organic Nonlinear Optical Materials
Manfred Eich; Manfred Eich; Mark G. Kuzyk, Editor(s)

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