A polarization-independent liquid crystal phase modulation using polymer-network liquid crystals in a 90°twisted cell

Yi-Hsin Lin*, Ming Syuan Chen, Wei Chih Lin, Yu Shih Tsou

*Corresponding author for this work

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

A polarization-independent liquid crystal phase modulation using polymer-network liquid crystals in a 90°twisted cell (T-PNLC) is demonstrated. T-PNLC consists of three layers. Liquid crystal (LC) directors in the two layers near glass substrates are orthogonal to each other and those two layers modulate two eigen-polarizations of an incident light. As a result, two eigen-polarizations of an incident light experience the same phase shift. In the middle layer, LC directors are perpendicular to the glass substrate and contribute no phase shift. The phase shift of T-PNLC is electrically tunable and polarization-independent. T-PNLC does not require any bias voltage for operation. The phase shift is 0.28 π rad for the voltage of 30 V rms. By measuring and analyzing the optical phase shift of T-PNLC at the oblique incidence of transverse magnetic wave, the pretilt angle of LC directors and the effective thickness of three layers are obtained and discussed. The potential applications are spatial light modulators, laser beam steering, and micro-lens arrays.

Original languageEnglish
Article number024505
JournalJournal of Applied Physics
Volume112
Issue number2
DOIs
StatePublished - 15 Jul 2012

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