Novel type of tunable infrared filters based on the Al2O3 particles - Liquid crystal system

作者：Ibragimov Tahir D^*; Bayramov Gazanfar M

来源：Infrared Physics & Technology, 2012, 55(1): 56-59.

DOI：10.1016/j.infrared.2011.09.001

• Liquid crystal
• Optical transmission
• Orientation of molecules
• Aluminum oxide
• Germanium

The optical transmission of small aluminum oxide particles in liquid crystal 4-methoxybenzylidene-4'-butylaniline (MBBA) and dual-frequency liquid crystal mixture consisting of 4-n-penty1-4'-cyanobiphenyl (5CB), 4-hexyloxyphenyl ester 4'-hexyloxy-3-nitrobenzoic acid (C2), 4-n-pentanoyloxy-benzoic acid-4'-hexyloxyphenyl ester (H 22) was studied. It was established that there was a transmission band which was shifted on application of a voltage and depended on temperature. At using the dual-frequency liquid crystal as a matrix, a transmission band maximum switched at changing of the frequency. The experimental results are explained by the optical homogeneity of the system in a narrow wavenumber interval when the refractive indices of the particle material and the matrix are close, and also by re-orientation of the liquid crystal molecules when a voltage is applied. The obtained results can be used in constructing of tunable filters and compact monochromators.

• 出版日期2012-1