| 摘要 |
PURPOSE:To make a device higly sensitive and highly dense and further, superior in a preservation stability by performing a write by changing the optical thickness of a optical modulation layer as keeping it higher than a glass transition point, and maintaining a write state by turning it lower than the glass transition point, and reproducing a record by discriminating the reflected light quantity of an incident light. CONSTITUTION:A chemical compound with the glass transition point Tg is used as the optical modulation layer, and the stability of the record is extremely improved by maintaining the recorded state below the glass transition point Tg. Th optical modulation layer, stabilized by such a way, can endure against a long term preservation because the direction and the largeness of a spontaneous polarization are not influenced by a temperature change or an atmospheric electric charge, and an error rate decreases as well. Besides, if it is fixed below the Tg, in a case too that it is read out by using a double refraction corresponding to the direction of the spontaneous polarization, it can be read out stably. Thus, a recording/reproducing device with the optical modulation element of the high sensitivity and the high density can be obtained.
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