A study of near-lossless analog phase modulation in V-shaped switching FLC cells

David Engstrom; Per Rudquist; Jorgen Bengtsson; Koen D'have; Sheila Galt

doi:10.1117/12.617173

20 August 2005 A study of near-lossless analog phase modulation in V-shaped switching FLC cells

David Engstrom, Per Rudquist, Jorgen Bengtsson, Koen D'have, Sheila Galt

Proceedings Volume 5936, Liquid Crystals IX; 593610 (2005) https://doi.org/10.1117/12.617173
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

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.

Citation Download Citation

David Engstrom, Per Rudquist, Jorgen Bengtsson, Koen D'have, and Sheila Galt "A study of near-lossless analog phase modulation in V-shaped switching FLC cells", Proc. SPIE 5936, Liquid Crystals IX, 593610 (20 August 2005); https://doi.org/10.1117/12.617173

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