We present a polarization-multiplexed optical memory with urethane–urea copolymers. The side chains of the urethane–urea copolymers induce <i>cis–trans</i> isomerization by illumination of blue or green light, and they align perpendicular to the linear polarization of the illuminated light, thus producing optical anisotropy. We found that the material showed selective anisotropy for the particular direction that was perpendicular to that of the recording beam polarization. By use of the anisotropic property three different data pages were multiplexed at the same spot of the medium. Erasure of the recorded bit data is also demonstrated.
© 1999 Optical Society of America
(160.1190) Materials : Anisotropic optical materials
(160.4890) Materials : Organic materials
(210.0210) Optical data storage : Optical data storage
(210.4810) Optical data storage : Optical storage-recording materials
Samer Alasfar, Masahiko Ishikawa, Yoshimasa Kawata, Chikara Egami, Okihiro Sugihara, Naomichi Okamoto, Masaaki Tsuchimori, and Osamu Watanabe, "Polarization-Multiplexed Optical Memory with Urethane–Urea Copolymers," Appl. Opt. 38, 6201-6204 (1999)