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 AmericaFull Article | PDF Article
M. Ishikawa, Y. Kawata, C. Egami, O. Sugihara, N. Okamoto, M. Tsuchimori, and O. Watanabe
Opt. Lett. 23(22) 1781-1783 (1998)
Samer Alasfar, Masahiko Ishikawa, Yoshimasa Kawata, Chikara Egami, Okihiro Sugihara, Naomichi Okamoto, Masaaki Tsuchimori, and Osamu Watanabe
Appl. Opt. 38(29) 6201-6204 (1999)
Baoli Yao, Yingli Wang, Ming Lei, Neimule Menke, Guofu Chen, Yi Chen, Tiankai Li, and Meigong Fan
Opt. Express 13(1) 20-25 (2005)