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Title: Ultra-fast solid state electro-optical modulator based on liquid crystal polymer and liquid crystal composites

A different generation of polymer-dispersed liquid crystals (PDLCs) based on a liquid crystalline polymer host is reported wherein the fluid behavior of the reactive mesogenic monomer is an enabler to concentration windows (liquid crystal polymer/liquid crystal) (and subsequent morphologies) not previously explored. These liquid crystal (LC) polymer/LC composites, LCPDLCs, exhibit excellent optical and electro-optical properties with negligible scattering losses in both the ON and OFF states. These systems thus have application in systems where fast phase modulation of optical signal instead of amplitude control is needed. Polarized optical microscopy and high resolution scanning electron microscopy confirm a bicontinuous morphology composed of aligned LC polymer coexisting with a phase separated LC fluid. Operating voltages, switching times, and spectra of LCPDLCs compare favourably to conventional PDLC films. The LCPDLCs exhibit a low switching voltage (4–5 V/μm), symmetric and submillisecond (200 μs) on/off response times, and high transmission in both the as formed and switched state in a phase modulation geometry.
Authors:
; ; ;  [1] ; ;  [2]
  1. Beam Engineering for Advanced Measurements Company, Winter Park, Florida 32789 (United States)
  2. Air Force Research Laboratory, Wright-Patterson Air Force Base, Ohio 45433-7707 (United States)
Publication Date:
OSTI Identifier:
22395452
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 23; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION SPECTRA; COMPARATIVE EVALUATIONS; COMPOSITE MATERIALS; CONCENTRATION RATIO; ELECTRIC POTENTIAL; FILMS; LIQUID CRYSTALS; MODULATION; MONOMERS; MORPHOLOGY; OPTICAL MICROSCOPY; OPTICAL PROPERTIES; POLYMERS; SCANNING ELECTRON MICROSCOPY; SOLIDS; SYMMETRY