title: Determination of optical parameters of a twisted-nematic liquid crystal by phase-sensitive optical heterodyne interferometric ellipsometry.
abstract: 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.
authors.affiliation: Institute of Biophotonics Engineering, National Yang-Ming University, Taipei, Taiwan 112.
authors.forename: Chien-Chung
authors.initials: CC
authors.lastname: Tsai
authors.forename: Chien
authors.initials: C
authors.lastname: Chou
authors.forename: Chien-Yuan
authors.initials: CY
authors.lastname: Han
authors.forename: Cheng-Hung
authors.initials: CH
authors.lastname: Hsieh
authors.forename: Kuo-Yu
authors.initials: KY
authors.lastname: Liao
authors.forename: Yu-Faye
authors.initials: YF
authors.lastname: Chao