An alternative method for simultaneously measuring cell parameters of a twisted-nematic liquid crystal cell

Kun Huang Chen, Jing Heng Chen, Jiun You Lin, Der Chin Su, Jung Chieh Su

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

A phase-sensitive method is developed to simultaneously measure the cell parameters of a TNLC (twisted-nematic liquid crystal) cell based on Jones calculus and the heterodyne interferometric ellisometry. These cell parameters include the twist angle, the cell gap, and the angle of the entrance LC director. When a circularly polarized heterodyne light beam normally passes through a TNLC cell, the phase difference between the p- and s- polarization of the interference signal can be measured accurately with an analyzer and the heterodyne interferometric ellisometry. The phase difference depends on the azimuth angle of the analyzer and the parameters. By substituting the measured values of the phase differences at three different azimuth angles of the analyzer into the special equations derived with Jones calculus. Hence these three parameters can be estimated by using a personal computer with numerical analysis technique. Because of its common path optical configuration and its heterodyne interferometric ellisometry, this method has many merits such as high stability against the surrounding vibration, high resolution, and easy operation.

Original languageEnglish
Pages (from-to)1023-1026
Number of pages4
JournalPhysica Status Solidi (C) Current Topics in Solid State Physics
Volume5
Issue number5
DOIs
Publication statusPublished - 2008 Dec 1
Event4th International Conference on Spectroscopic Ellipsometry, ICSE4 - Stockholm, Sweden
Duration: 2007 Jun 112007 Jun 15

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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