Determination of optical parameters of a twisted-nematic liquid crystal by phase-sensitive optical heterodyne interferometric ellipsometry.
What is believed to be a novel phase-sensitive optical heterodyne interferometric ellipsometer is set up to characterize a twisted-nematic liquid crystal (TN-LC) by the elliptical parameters of the output polarization state. This ellipsometer presents the advantages of both polarized optical heterodyne interferometry and optical photometry, which introduce a polarization modulation that is capable of performing with high-sensitivity on phase detection in real time. The twist angle phi and the untwisted phase retardation gamma of TN-LC are measured precisely. The experimental results verify that a TN-LC can be treated as identical to an elliptical retarder.
Tsai
Chien-Chung
CC
Institute of Biophotonics Engineering, National Yang-Ming University, Taipei, Taiwan 112.
Chou
Chien
C
Han
Chien-Yuan
CY
Hsieh
Cheng-Hung
CH
Liao
Kuo-Yu
KY
Chao
Yu-Faye
YF