David A. Jared

Optically addressed thresholding very-large-scale-integration/liquid-crystal spatial light modulators

Two 32 x 32 array optically addressed thresholding spatial light modulators consisting of a very-large-scale-integration chip and a ferroelectric liquid-crystal modulator are presented. The intensity contrast ratios range from 3:1 and 11:1, and the response times range from 500 micros to 6 ms.

Joint transform correlator using an amorphous silicon ferroelectric liquid crystal spatial light modulator

Abstract A joint transform correlator is demonstrated that utilizes a high-speed optically addressed spatial light modulator in the Fourier plane consisting of an hydrogenated amorphous silicon photodiode and a ferroelectric liquid crystal modulator. Results are shown for binary-amplitude modulation using a smectic C ∗ ferroelectric liquid crystal operating at 4600 frame/s, 20:1 contrast ratio, and 70 lp/mm.

Ferroelectric Liquid Crystal Spatial Light Modulators

This paper discusses the operating characteristics of a new class of spatial light modulators that utilize ferroelectric liquid crystals, and their application to building optoelectronic computing architectures.

Electrically addressed spatial light modulator that uses a dynamic memory

The operating characteristics of a 64 x 64 array electrically addressed spatial light modulator that uses a dynamic memory on a very-large-scale-integration chip and a ferroelectric liquid-crystal modulator are discussed.

Optical correlator using very-large-scale integrated circuit/ferroelectric-liquid-crystal electrically addressed spatial light modulators

The use of 2-kHz 64 × 64 very-large-scale integrated circuit/ferroelectric-liquid-crystal electrically addressed spatial light modulators as the input and filter planes of a VanderLugt-type optical correlator is discussed. Liquid-crystal layer thickness variations that are present in the devices are analyzed, and the effects on correlator performance are investigated through computer simulations. Experimental results from the very-large-scale-integrated/ferroelectric-liquid-crystal optical-correlator system are presented and are consistent with the level of performance predicted by the simulations.

Applications of binary and analog hydrogenated amorphous silicon/ferroelectric liquid-crystal optically addressed spatial light modulators

Analytical and experimental results that show novelty filtering, optical phase conjugation, and real-time edge enhancement by using optically addressed spatial light modulators that comprise amorphous silicon photodiodes and analog and binary ferroelectric liquid-crystal modulators are presented. The advantages of these devices for the above applications include high-speed, low-power operation and high spatial resolution.

Optical processor for zero-crossing edge detection

An optical processor for zero-crossing edge detection is presented which consists of two defocused imaging systems to perform the Gaussian convolutions and a VLSI, ferroelectric liquid crystal spatial light modulator (SLM) to determine the zero-crossings. The zero-crossing SLM is a 32 X 32 array of pixels located on 100 micrometers centers. Each pixels contains a phototransistor, an auto-scaling amplifier, a zero-crossing detection circuit, and a liquid crystal modulating pad. Electrical and optical characteristics of the zero-crossing SLM are presented along with experimental results of the system.

Joint Transform Correlation Using An Amorphous Silicon Ferroelectric Liquid Crystal Spatial Light Modulator

A joint transform correlator is demonstrated that utilizes a high-speed optically addressed spatial light modulator in the Fourier plane consisting of an hydrogenated amorphous silicon photodiode and a ferroelectric liquid crystal modulator. Results are shown for binary-amplitude modulation using a smectic C* ferroelectric liquid crystal operating at 4600frame/s, 20:1 contrast ratio, and 38lp/mm.