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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Vol. 20, Iss. 3 — Feb. 1, 1995
  • pp: 303–305

Smart-pixel spatial light modulator for incorporation in an optoelectronic neural network

Ido Bar-Tana, John P. Sharpe, Douglas J. McKnight, and Kristina M. Johnson  »View Author Affiliations


Optics Letters, Vol. 20, Issue 3, pp. 303-305 (1995)
http://dx.doi.org/10.1364/OL.20.000303


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Abstract

We present the design, fabrication, and testing of a novel liquid-crystal-on-silicon optically addressed spatial light modulator for use as a weight matrix in an ART-1 optoelectronic neural processor. Each pixel in the 50 × 83 element array occupies 75 μm × 75 μm and consists of a photodetector, a threshold circuit, a 1-bit (flip-flop) memory element, and a liquid-crystal modulating mirror. The array is designed to switch all the pixels initially to the ON state. Subsequently each pixel is independently switched to the OFF state if a superthreshold amount of light falls upon the pixel’s photodetector. The device has a contrast ratio of 20:1, a switch-on time (10–90% rise time) of 500 μs, and a switch-off time of ~500 μs (depending on the externally set threshold). Measured device uniformities and interpixel coupling are also described.

© 1995 Optical Society of America

History
Original Manuscript: October 11, 1994
Published: February 1, 1995

Citation
Ido Bar-Tana, John P. Sharpe, Douglas J. McKnight, and Kristina M. Johnson, "Smart-pixel spatial light modulator for incorporation in an optoelectronic neural network," Opt. Lett. 20, 303-305 (1995)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-20-3-303

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