Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1993-11-15
1996-04-23
Gross, Anita Pellman
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359100, 359260, 359279, G02F 11343, G02F 113, G02F 103, G02F 101
Patent
active
055109144
ABSTRACT:
This invention provides analog phase modulators comprising smetic liquid crystal cells wherein the layers are specifically not aligned perpendicular to the cell walls. The layers are either tilted with respect to the substrate or are in a chevron structure. Application of an analog electric field perpendicular to the cell walls bends the molecules in an analog fashion in a plane not parallel to the cell walls and thereby provides analog phase modulation of incident light. Analog phase modulation can not be directly provided by the surface-stabilized smectic liquid crystal cells known in the art, nor can analog tilting of SmC* liquid crystals be achieved. This invention further provides Fabry-Perot devices containing these analog phase modulators within the resonance cavity. The filter of this invention is optimally suited for wavelength-division multiplexing in photonic networks. It has high throughput, large tuning range, high resolution, and high modulation speed. The filter requires only small applied electric fields and has a very simple and inexpensive processing procedure.
REFERENCES:
patent: 4367924 (1983-01-01), Clark et al.
patent: 4848663 (1989-06-01), Lagerwall et al.
patent: 5078477 (1992-01-01), Jono et al.
patent: 5150236 (1992-09-01), Patel
patent: 5151804 (1992-09-01), Verhulst et al.
patent: 5223963 (1993-06-01), Okada et al.
patent: 5377026 (1994-12-01), Liu et al.
patent: 5381253 (1995-01-01), Sharp et al.
Maclennan, J. E. et al., "Director reorientation dynamics in chevron ferroelectric liquid crystal cells," (1990) Liquid Crystals 7(6):787-796.
Maclennan, J. E., et al., "Director orientation in chevron surface-stabilized ferroelectric liquid crystal cells: Verification of orientational binding at the chevron interface using visible polarized light transmission spectroscopy," (1990) Liquid crystals 7(6):753-785.
Elston, S. J. and Sambles, J. R., "The Observation of Half Splayed States in Ferroelectric Liquid Crystal Filled Cells by the Excitation of Optic Modes", Jpn J. Applied Physics (1990) 29(4):L641-L644.
Kondo and Akahane, "Chevron Layer Structure and Focal Conics in Chiral Smectic C Liquid-Crystal Cells Aligned by SiO Oblique Evaporation Technique", Jpn. J. Applied Physics (1991) 30(9B) L1659-L1661.
Liu et al., "Room temperature 10 MHz electro-optic modulation in ferroelectrc liquid crystals", Appl. Phys. Lett. (1993) 62(9):934-936.
Liu, Jian-Yu, "Second-order Nonlinearities in Ferroelectric Liquid Crystal Materials," Ph.D. Thesis submitted to Faculty of Graduate School of Univ. of Colorado, 1992, pp. 129-138.
Willis, "X-ray and Optical Studies of Electric Field Induced Layer Structure Changes in SSFLC Cells", Ph.D. Thesis submitted to Faculty of Graduate School of Univ. of Colorado (1992) pp. 10-26.
Yamada, Y. et al., "Investigation of Switching Behavior in a Ferroelectric Liquid Crystal Aligned on Obliquely Deposited SiO Films", Jpn. J. of Applied Physics (1989) 28(1):50-55.
Johnson Kristina M.
Liu Jian-Yu
Gross Anita Pellman
Malinowski Walter J.
The Regents of the University of Colorado
LandOfFree
Smectic liquid crystal analog phase modulator does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Smectic liquid crystal analog phase modulator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Smectic liquid crystal analog phase modulator will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2313651