Formation of photo-induced index grating in azo-carbazole dye-doped polymer

Yutaka Kawabe; Kodai Fukuzawa; Takuya Uemura; Katsufumi Matsuura; Toshio Yoshikawa; Jun-ichi Nishide; Hiroyuki Sasabe

doi:10.1117/12.928554

11 October 2012 Formation of photo-induced index grating in azo-carbazole dye-doped polymer

Yutaka Kawabe, Kodai Fukuzawa, Takuya Uemura, Katsufumi Matsuura, Toshio Yoshikawa, Jun-ichi Nishide, Hiroyuki Sasabe

Proceedings Volume 8474, Optical Processes in Organic Materials and Nanostructures; 84740U (2012) https://doi.org/10.1117/12.928554
Event: SPIE Organic Photonics + Electronics, 2012, San Diego, California, United States

Abstract

An azo-carbazole dye, 3-[(4-Nitrophenyl)azo]-9H-carbazole-9-ethanol (NACzEtOH), and its relatives doped in polyacrylate films have been known to show ‘photorefractive’ effect without external electric field even in symmetric optical alignment. We have already observed strong energy transfer due to phase-shifted grating by two-beam coupling experiments made for NACzEtOH doped PMMA films. Although the operation mechanism is still unknown, the high efficiency of diffraction is very promising for the application to real-time holography. For the convenience of analysis, we modified Kogelnik’s theory for thick grating by correcting the constraint condition and applied it to evaluate refractive index modulation and other parameters quantitatively. In order to clarify the operation mechanism, we conducted the writing and erasing of gratings by using red and green laser beams and analyzed the diffraction magnitude and response dynamics, showing that the response time strongly depended on the writing wavelength, and that the grating formation and its phase shift were not always synchronized.

Citation Download Citation

Yutaka Kawabe, Kodai Fukuzawa, Takuya Uemura, Katsufumi Matsuura, Toshio Yoshikawa, Jun-ichi Nishide, and Hiroyuki Sasabe "Formation of photo-induced index grating in azo-carbazole dye-doped polymer", Proc. SPIE 8474, Optical Processes in Organic Materials and Nanostructures, 84740U (11 October 2012); https://doi.org/10.1117/12.928554

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