Design and simulation of single-electrode liquid crystal phased arrays |
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Authors: | B Bellini M A Geday N Bennis A Spad?o X Quintana J M Otón R D?browski |
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Institution: | (1) Dpto. Tecnología Fotónica, ETSI Telecommunicación, Universidad Politécnica de Madrid, Ciudad Universitaria s/n, E-28040 Madrid, Spain;(2) Institute of Chemistry, Military University of Technology, 2 Kaliskiego Str., 00-908 Warsaw, Poland |
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Abstract: | Liquid 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. |
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Keywords: | liquid crystals phased arrays silicon |
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