Optical logic device

Details Optical logic device Optical logic device

1988-08-01

1991-02-12

Ullah, Akm

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

365108, 350347R, 350351, 350 9620, H01J 3150, G02F 113, G11C 1304, G02B 626

Patent

active

049926543

ABSTRACT:
An optical logic device consists of a bistable liquid crystal layer (BOD 1) of the thermally-induced birefringent (TIB) type settable by one or more write beams and rfead by a beam of a different wavelength or different light polarization. Thus the read and write beams are optically decoupled. Two such devices (BOD 1 and BOD 2) in tandem form a 3-input AND gate. Here beams A and B are write beams for the first device, (BOD 1), and beam C is the read beam for the first device. For the second device (BOD 2) the write beams are the output of the first device (BOD 1) and beam D, the read beam being beam E. The two read beams have different wavelengths from the write beam. In a second version, the liquid crystal layer is on the base of a prism via which the beams reads it. Write beams go right through the layer, while a read beam is "reflected" from the layer but is modulated by the state thereof. This is an OR gate. Logic assemblies can use combinations of such AND or OR gates.

REFERENCES:
patent: 4351589 (1982-09-01), Chavel et al.
patent: 4466702 (1984-08-01), Wiener-Avnear et al.
patent: 4573767 (1986-04-01), Jewell
patent: 4720175 (1988-01-01), Haus et al.
patent: 4783150 (1988-11-01), Tabony
patent: 4790634 (1988-12-01), Miller et al.

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