Abstract

We present a two-photon-induced polarization-multiplexed and multilevel data storage method with a bis azobenzene copolymer film. A polarization-adjustable femtosecond pulsed laser is used as writing beam to induce anisotropy, and the recorded information is retrieved by a CCD sensor from the film with corresponding polarized illumination. It is found that the optical axis of bisazobenzene molecules can be reoriented under two-photon excitation by the polarized femtosecond laser via a photoisomerization process. Polarization-multiplexed and multilevel storage is demonstrated by using this method. The capability to combine both advantages of these distinct techniques makes it a novel approach to obtain higher optical data density.

© 2009 Optical Society of America

Two-stage optical recording: photoinduced birefringence and surface-mediated bits storage in bisazo-containing copolymers towards ultrahigh data memory

Yanlei Hu, Dong Wu, Jiawen Li, Wenhao Huang, and Jiaru Chu
Opt. Express 24(20) 23557-23565 (2016)

Polarization-multiplexed optical memory with urethane–urea copolymers

Samer Alasfar, Masahiko Ishikawa, Yoshimasa Kawata, Chikara Egami, Okihiro Sugihara, Naomichi Okamoto, Masaaki Tsuchimori, and Osamu Watanabe
Appl. Opt. 38(29) 6201-6204 (1999)

Rewritable polarization-encoded multilayer data storage in 2,5-dimethyl-4-(p-nitrophenylazo)anisole doped polymer

Xiangping Li, James W. M. Chon, Shuhui Wu, Richard A. Evans, and Min Gu
Opt. Lett. 32(3) 277-279 (2007)

Polarization multiplexed write-once–read-many optical data storage in bacteriorhodopsin films

Baoli Yao, Ming Lei, Liyong Ren, Neimule Menke, Yingli Wang, Thorsten Fischer, and Norbert Hampp
Opt. Lett. 30(22) 3060-3062 (2005)

All-optical subdiffraction multilevel data encoding onto azo-polymeric thin films

Matteo Savoini, Paolo Biagioni, Lamberto Duò, and Marco Finazzi
Opt. Lett. 34(6) 761-763 (2009)