Static information storage and retrieval – Read/write circuit – Optical
Patent
1991-01-23
1993-07-13
LaRoche, Eugene R.
Static information storage and retrieval
Read/write circuit
Optical
365112, 365234, G11C 1304
Patent
active
052280012
ABSTRACT:
An electro optical random access memory uses a film of bacteriorhodopsin or similar photochromic substance which can change between two light absorbing states in response to light of each of two wavelengths. In one embodiment combined red and green laser beams are steered in two orthogonal directions to memory locations on the film. The relative amounts of the light of the two wavelength reflected from memory cell is sensed and discriminated to indicate "1" or "0". A crowbar circuit holds one or the other of the two laser beams on to compensate for degradation that occurs in a read cycle. In another embodiment a single wavelength is employed for read and write operations, but at a much greater strength for the write operation.
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Birge Robert R.
Lawrence Albert F.
LaRoche Eugene R.
Syracuse University
Yoo Do Hyun
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