Spatial optical modulator

Details Spatial optical modulator Spatial optical modulator

1990-06-11

1992-04-21

Popek, Joseph A.

Static information storage and retrieval

Information masking

Polarization

365170, G11C 1118

Patent

active

051074605

ABSTRACT:
An optical modulator utilizing a magnetic semiconductor device, whose operation is based on the Hall effect, includes a magnetic material formed on a semiconductor substrate. When an incoming beam of light having a dominant polarization direction is directed onto the magnetic material it becomes modulated. The result is an outgoing beam of light which has a rotated plane of polarization when compared to the dominant polarization direction. The direction of the rotated plane of polarization is indicative of the information stored in the magnetic material. The modulator of the present invention further includes a means for writing the information to the magnetic material and a semiconductor sensor means for electrically verifying the contents of the magnetic material.

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patent: 4837526 (1989-06-01), Suzuki et al.
IBM Technical Disclosure Bulletin, vol. 3, No. 10, Mar. 1961, J. J. Coughlin et al., "Non-Destructive Readout For Thin Film Memory", p. 7.

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