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Optically addressed spatial light modulator with a high photosensitivity and intensity adaptation range.

K Sayyah, U Efron

|October 31, 2009

Summary

A novel optically addressed spatial light modulator (OASLM) using silicon Schottky diodes and liquid crystals achieves high photosensitivity and a wide dynamic range. This device offers excellent resolution, contrast, and fast response times across a broad spectrum.

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Area of Science:

Optoelectronics
Materials Science
Photonics

Background:

Optically addressed spatial light modulators (OASLMs) are crucial for real-time optical information processing.
Existing OASLMs often face limitations in photosensitivity, dynamic range, or response speed.
Development of advanced photoreceptor materials is key to overcoming these limitations.

Purpose of the Study:

To demonstrate a novel optically addressed spatial light modulator (OASLM).
To utilize a single-crystal silicon Schottky diode array as the photoreceptor.
To achieve high photosensitivity and a wide input light intensity adaptation range.

Main Methods:

Fabrication of an OASLM integrating a silicon Schottky diode array photoreceptor with nematic liquid crystals.
Characterization of photosensitivity, input light intensity adaptation range, spatial resolution, contrast ratio, and response time.
Evaluation of performance across a wide photosensing wavelength range (400-1100 nm).

Main Results:

Achieved high photosensitivity exceeding 1 microW/cm(2).
Demonstrated an input light intensity adaptation range greater than 3 orders of magnitude.
Concurrent performance included spatial resolution of 25 line pairs/mm, contrast ratios >200:1, and response times <10 ms.
The device operated effectively over a broad spectral range from 400 nm to 1100 nm.

Conclusions:

The developed OASLM exhibits superior photosensitivity and dynamic range compared to existing technologies.
The silicon Schottky diode array photoreceptor enables high-performance modulation.
This device shows significant potential for advanced optical systems requiring real-time light modulation.