Optical steering of mutual capacitance in a nematic liquid crystal cell

Filip A. Sala , Marzena Sala-Tefelska

Abstract

In this study, a variable capacitor made of a nematic liquid crystal cell is proposed and analyzed theoretically. The mutual capacitance is steered with an optical beam of a Gaussian shape launched into the cell. The optical field changes the orientation of the molecules and affects the capacitance. By using Frank&x2013;Oseen elastic theory, the molecular reorientation is simulated. The influence of various parameters on capacitance, such as beam width, anchoring condition, externally applied voltage, beam power, and launching position, is presented. For instance, the maximum tuning range is achieved for wide beams and the molecules initially aligned close to the propagation axis. It is also proved that launching position, especially for narrow beams, has limited influence on capacitance. The proposed component can be used, for instance, in optical power meters, as feedback in laser or light-emitting diode systems or just as a variable capacitor in optoelectronic circuits. One of the advantages of this device is that the beam passes through the element, so steering of the capacitance or measuring the parameters of the beam can be realized in-system, without splitting the beam. Moreover, due to the low thickness of the liquid crystal layer, the attenuation is very low.
Author Filip A. Sala ZOiF
Filip A. Sala,,
- Optics and Photonics Division
, Marzena Sala-Tefelska ZOiF
Marzena Sala-Tefelska,,
- Optics and Photonics Division
Journal seriesJournal of the Optical Society of America B-Optical Physics, ISSN 0740-3224
Issue year2018
Vol35
No1
Pages133-139
Publication size in sheets0.5
Keywords in EnglishLiquid crystals; Liquid-crystal devices
DOIDOI:10.1364/JOSAB.35.000133
URL http://josab.osa.org/abstract.cfm?URI=josab-35-1-133
Languageen angielski
Score (nominal)35
ScoreMinisterial score = 30.0, 04-01-2018, ArticleFromJournal
Ministerial score (2013-2016) = 35.0, 04-01-2018, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 1.843 (2) - 2016=1.671 (5)
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