Some methods for irreversible write-once recording in 'biochrom' films

Summary form only given. The data-storage capabilities of the photochromic material biochrom, a film based on bacteriorhodopsin (BR) embedded into a polymeric matrix, are described. The material is capable of recording optical information (upon exposure to light) with constant and reversible storage at high spatial resolution (>5*10/sup 3/ lines/mm), photosensitivity up to 10/sup -3/ J/cm/sup 2/, and high cycling (10/sup 4/ cycles). Various types of recording (holographical, polarizable, by bits, etc.) are possible. Image recording is performed by yellow light and its erasure by blue light.<
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