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Proceedings Paper

Thin-film photosensor design and fabrication issues for liquid-crystal spatial-light modulators
Author(s): Pierre R. Barbier; Li Wang; Garret Moddel
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Paper Abstract

Liquid crystal (LC) optically addressed spatial light modulators (OASLMs) have been successfully addressed with semiconductor thin film photosensors. Nematic liquid crystals (NLCs), which are insensitive to the polarity of the applied voltage, are addressed with photoconductive thin film structures having symmetric current-voltage characteristics. Much faster ferroelectric liquid crystals (FLC), which are polarity sensitive, are addressed with asymmetric photodiodes or photoconductive diodes. The highest performance OASLMs have been fabricated using FLCs and a-Si:H photodiodes as the photosensor. In this paper we analyze the role of the thin film photosensor in a LC OASLM and present design criteria. From these criteria we discuss hydrogenated amorphous silicon (a-Si:H) photosensor structures for use in OASLMs. In particular we review the a-Si:H p-i-n photodiode, the transparent conducting oxide (TCO)/intrinsic a-Si:H photoconducting diode, and the metal/insulator/a-Si:H structures which have been successfully incorporated into FLC OASLMs, and the n-i-n photoconductor which has not.

Paper Details

Date Published: 15 October 1993
PDF: 13 pages
Proc. SPIE 2022, Photodetectors and Power Meters, (15 October 1993); doi: 10.1117/12.158569
Show Author Affiliations
Pierre R. Barbier, Univ. of Colorado/Boulder (United States)
Li Wang, Univ. of Colorado/Boulder (United States)
Garret Moddel, Univ. of Colorado/Boulder (United States)

Published in SPIE Proceedings Vol. 2022:
Photodetectors and Power Meters
Kenneth J. Kaufmann, Editor(s)

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