A writing/erasing method for use in connection with homotropic organic optical media is disclosed and claimed. The method includes writing on a thin film with light of a first linear polarity to induce birefringence along the direction of an optical axis of the film's initial state followed by erasing...http://www.google.com.hk/patents/US5251197?utm_source=gb-gplus-share專利 US5251197 - Polarization dependent writing and erasing process for organic optical media
