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Applied Physics Letters / Browse Journal / Volume 55 / Issue 6

Appl. Phys. Lett. 55, 537 (1989); doi:10.1063/1.101847 (3 pages)

High‐speed binary optically addressed spatial light modulator

G. Moddel1, K. M. Johnson1, W. Li1, R. A. Rice1, L. A. Pagano‐Stauffer2, and M. A. Handschy2

1Department of Electrical and Computer Engineering and Optoelectronic Computing Systems Center, University of Colorado, Boulder, Colorado 80309‐0425 Map This map
2Displaytech, Incorporated, 2200 Central Avenue, Suite A, Boulder, Colorado 80301 Map This map

(Received 31 March 1989; accepted 30 May 1989)

We describe the structure and operating characteristics of a high‐speed optically addressed spatial light modulator (OASLM) with a hydrogenated amorphous silicon (a‐Si:H) photosensor and a ferroelectric liquid‐crystal modulator. The photosensor is a p‐i‐n photodiode, which switches the liquid crystal into one of two stable states. Under a write‐light intensity of 6 mW/cm2, the OASLM exhibits a response time of 155 μs, a contrast ratio of 20:1, and a resolution of 40 lp/mm. The writing sensitivity per pixel is 0.1 pJ.

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KEYWORDS and PACS

Keywords

OPERATION, DESIGN, OPTICAL MODULATORS, OPTOELECTRONIC DEVICES, SILICON, PHOTODIODES, SENSITIVITY, AMORPHOUS STATE, FERROELECTRIC MATERIALS, OPTICAL MATERIALS

PACS

ARTICLE DATA

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http://link.aip.org/link/APPLAB/v55/i6/p537/s1

PUBLICATION DATA

ISSN:

0003-6951 (print)  
1077-3118 (online)

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  1. For a review, see C. Warde and A. D. Fisher, in Optical Signal Processing, edited by J. Horner (Academic, San Diego, 1987).
  2. J. W. Goodman, Tutorial on Optical Computing, Optical Society of America Annual Meeting, Seattle, WA, 1986.
  3. T. D. Beard, W. P. Bleha, and S.-Y. Wong, Appl. Phys. Lett. 22, 90 (1973APPLAB000022000003000090000001).
  4. P. R. Ashley and J. H. Davis, Appl. Opt. 26, 241 (1987).
  5. D. Armitage, J. I. Thackara, N. A. Clark, and M. A. Handschy, Mol. Cryst. Liq. Cryst. 144, 309 (1987).
  6. D. Williams, S. G. Latham, C. M. J. Powels, M. A. Powell, R. C. Chittick, A. P. Sparks, and N. Collings, J. Phys. D 21, 5156 (1988).
  7. G. Moddel, K. M. Johnson, and M. A. Handschy, Proc. SPIE 754, 207 (1987).
  8. Glasstech Solar, Inc., 12441 W. 49 Ave., Wheat Ridge, CO 80033, and our laboratory.
  9. British Drug House (BDH) Limited, Broom Road, Poole, BH12 4NN, England.
  10. N. A. Clark and S. T. Lagerwall, Ferroelectrics 59, 25 (1984)
    M. A. Handschy and N. A. Clark, ibid. 59, 69 (1984).
  11. For this reason we believe that the photosensor described in Ref. 6 is a photodiode formed by a heterojunction at the ITO/alpha-Si:H and/or alpha-Si:H/FLC interface (s).
  12. W. Li, R. A. Rice, G. Moddel, L. A. Pagano-Stauffer, and M. A. Handschy (unpublished).
  13. N. A. Clark and S. Lagerwall, Appl. Phys. Lett. 36, 899 (1980APPLAB000036000011000899000001).
  14. L. A. Pagano-Stauffer, K. M. Johnson, N. A. Clark, and M. A. Handschy, Proc. SPIE 684, 88 (1986).
  15. This corresponds to a modulation transfer function (MTF) of roughly 50%, assuming that the MTF at this spatial frequency is close to unity at high write light intensities.

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