Polarization effects in nematic liquid crystal optical phased arrays

2003 ◽  
Author(s):  
Scott R. Harris
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Phased Arrays ◽  
Polarization Effects ◽  
Optical Phased Arrays

Design and simulation of single-electrode liquid crystal phased arrays

2006 ◽  
Vol 14 (4) ◽  
Author(s):  
B. Bellini ◽  
M. Geday ◽  
N. Bennis ◽  
A. Spadło ◽  
X. Quintana ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Optical Switching ◽  
Phased Arrays ◽  
Driving Voltage ◽  
Linear Phase ◽  
High Birefringence ◽  
Reconfigurable Devices ◽  
University Of Technology ◽  
Optical Phased Arrays ◽  
The Military

AbstractLiquid crystal (LC) phased arrays and gratings have been employed in optical switching and routing [1]. These diffractive optic elements are of great interest because they can be scaled up to a large number of elements and their optical properties can be electrically addressed with a low driving voltage. LC phase gratings have been achieved either by periodic addressing of pixels or by using periodically-modified structures. The latter approach leads to less reconfigurable devices but the addressing is simpler.In this paper we focus on optical phased arrays where the phase is varied either continuously or discretely and where the periodicity is induced by electrode configuration. We first describe a possible structure based on a conductive silicon wafer. We argue that this structure can induce either continuously or discretely varying arrays while applying single voltage to the array. In the second part we simulate the behaviour of such arrays. We base the simulation on a LC synthesized at the Military University of Technology, this high-birefringence nematic LC shows in a 4-μm thick cell a linear phase shift range of more than 360° between 1.2 V and 1.8 V. We calculate the distribution of the LC molecule director and assess the performance of the array with respect to the applied voltage. Finally, the relevance of such technology for switchable phased arrays is discussed.

Polarization-independent two-dimensional beam steering using liquid crystal optical phased arrays

2017 ◽  
Vol 15 (10) ◽  
pp. 101601 ◽  
Author(s):  
Liang Wu Liang Wu ◽  
Xiangru Wang Xiangru Wang ◽  
Caidong Xiong Caidong Xiong ◽  
Ziqiang Huang Ziqiang Huang ◽  
Rusheng Zhuo Rusheng Zhuo ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Phased Arrays ◽  
Beam Steering ◽  
Two Dimensional ◽  
Optical Phased Arrays ◽  
Polarization Independent
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