Title :
Liquid crystal inorganic hybrid photorefractives
Author :
Cook, G. ; Glushchenko, A.V. ; Reshetnyak, V.Yu. ; Beckel, E.R. ; Saleh, M.A. ; Evans, D.R.
Author_Institution :
Air Force Res. Lab., Mater. & Manuf. Directorate, Wright-Patterson AFB, OH
Abstract :
We report on the photorefractive properties of liquid crystals sandwiched between windows of cerium doped strontium barium niobate (Ce:SBN). This adaptable design has been used to create devices using pure nematic liquid crystals, ferroelectric nanoparticle doped liquid crystals, and cholesteric liquid crystals. In all these systems, modulation of the liquid crystal molecules is driven by the surface space-charge field from the inorganic windows. Owing to the large effective trap density in the Ce:SBN, high resolution gratings with two-beam coupling gain coefficients of up to 1400 cm-1 have been achieved in the Bragg regime.
Keywords :
barium compounds; cerium; cholesteric liquid crystals; ferroelectric liquid crystals; multiwave mixing; nanoparticles; nematic liquid crystals; photorefractive materials; space charge; strontium compounds; SBN:Ce; cerium doped strontium barium niobate; cholesteric liquid crystals; effective trap density; ferroelectric nanoparticle doped liquid crystals; inorganic hybrid photorefractives; nematic liquid crystals; surface space-charge field; two-beam coupling gain coefficients; Barium; Bragg gratings; Cerium; Ferroelectric materials; Liquid crystal devices; Liquid crystals; Nanoscale devices; Niobium compounds; Photorefractive materials; Strontium;
Conference_Titel :
IEEE/LEOS Winter Topical Meeting Series, 2008
Conference_Location :
Sorrento
Print_ISBN :
978-1-4244-1594-6
Electronic_ISBN :
978-1-4244-1595-3
DOI :
10.1109/LEOSWT.2008.4444434
