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Proceedings Paper

A study of near-lossless analog phase modulation in V-shaped switching FLC cells
Author(s): David Engstrom; Per Rudquist; Jorgen Bengtsson; Koen D'have; Sheila Galt
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Paper Abstract

The analog switching mode (sometimes referred to as V-shaped switching mode) of the ferroelectric liquid crystal cell is a recently developed type of liquid crystal cell in which the molecular director can be arbitrarily positioned with high speed on the surface of a cone depending on the steering voltage over the cell. This changes the orientation of the slow and fast axes as well as the amount of the birefringence. We show that theoretically, it is possible to use a V-shaped switched ferroelectric liquid crystal cell to achieve near lossless analog phase modulation between zero and π radians for a special ellipticity of the polarized input light. We also fabricated a cell which slightly deviates from the ideal (tilt cone half-angle 38° instead of 45°) for which near-lossless transmission was obtained, manifested as a < 4% modulation of the amplitude, and a continuous phase modulation between 0 and ~0.8π radians; the values agree very well with numerical simulations.

Paper Details

Date Published: 20 August 2005
PDF: 9 pages
Proc. SPIE 5936, Liquid Crystals IX, 593610 (20 August 2005); doi: 10.1117/12.617173
Show Author Affiliations
David Engstrom, Chalmers Univ. of Technology (Sweden)
Per Rudquist, Chalmers Univ. of Technology (Sweden)
Jorgen Bengtsson, Chalmers Univ. of Technology (Sweden)
Koen D'have, IMEC (Belgium)
Sheila Galt, Chalmers Univ. of Technology (Sweden)

Published in SPIE Proceedings Vol. 5936:
Liquid Crystals IX
Iam-Choon Khoo, Editor(s)

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