Jpn. J. Appl. Phys. 37 (1998) pp. L587-L590 |Next Article| |Table of Contents|
|Full Text PDF (267K)| |Buy This Article|
Nematic Liquid Crystal Phase-Gratings for Reflective Spatial Light Modulators
IBM T.J. Watson Research Center,
P.O. Box 218, Yorktown Heights, N.Y. 10598, U.S.A.
(Received March 12, 1998; accepted for publication March 30, 1998)
The twisted nematic liquid crystal phase grating, using patterned alignment with opposite
twist angles for reflective spatial light modulators, is analyzed with respect to operating mode,
diffraction efficiency and operating voltage including the effect of disclination lines between
opposite twist domains. In general, the high-field difflactive modes have lower operating
voltages, slower response time and relatively higher contrast ratio than zero-field diffractive
modes. We describe a high-field diffractive mode with a twist angle of approximately ±54° for opposite twist domains which achieves an optical efficiency of nearly 100% and an estimated contrast ratio greater than 300:1 for monochromatic light.
- Y. Hori and K. Asai:
IEEE Trans. Electron Devices 26 (1979) 1734[CrossRef].
- M. Fritsch, H. Wohler, G. Haas and D. Mlynski:
IEEE Trans. Electron Devices 36 (1989) 1882[CrossRef].
- W. Gibbons, P. Shannon, S. Sun and B. Sweilin:
Nature 351 (1991) 49[CrossRef].
- P. Bos, J. Chen and J. Doane: SID95 (1995) 1995.
- C. M. Titus, P. J. Bos, C. Holton and W. Glenn: SID97 Digest (1997) 769.
- C. M. Titus and P. J. Bos:
Appl. Phys. Lett. 71 (1977) 2239[AIP Scitation].
- R. C. Jones:
J. Opt. Soc. 32 (1942) 486[IoP STACKS].
- Calculations based on TL222 nematic LC mixture from EM Merck, Germany.