Premium
Properties of optically addressed liquid crystal spatial light modulators studied by mach‐zehnder interferometry
Author(s) -
Komorowska Katarzyna,
Miniewicz Andrzej,
Parka Janusz
Publication year - 2004
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200450854
Subject(s) - liquid crystal , materials science , optics , interferometry , refractive index , mach–zehnder interferometer , phase (matter) , light intensity , laser , doping , optoelectronics , spatial light modulator , light beam , physics , quantum mechanics
In this work optically addressed liquid crystal spatial light modulators are experimentally investigated. Local reorientation of molecules in the modulator and local changes of effective refractive index n eff ( x,y ) are induced by modulated light intensity I ( x,y ). We present preliminary results of measurements of phase shifts in optically addressed liquid crystal panels using a Mach‐Zehnder interferometer. Experiments were performed for the panels filled with nematic and dye‐doped nematic liquid crystals. Optical addressing was realized by Ar+ laser beam (λ = 514.5 nm) while the reading beam was supplied by He‐Ne laser (632.8 nm). The operation voltage was in the range 4 ‐ 20 V. The total phase shift under the influence of addressing light for the studied systems was 2 ‐ 6 pagr;, sensitivity to the addressing light ∼ μW/cm 2 per 2π phase change and speed of response to the light was 20 ms ‐ 30 s with total recovery time 0.5 ‐ 120 s.