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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 16 — Aug. 3, 2009
  • pp: 14143–14149

Measurement of the pretilt angle and the cell gap of nematic liquid crystal cells by heterodyne interferometry

Kun-Huang Chen, Wei-Yao Chang, and Jing-Heng Chen  »View Author Affiliations


Optics Express, Vol. 17, Issue 16, pp. 14143-14149 (2009)
http://dx.doi.org/10.1364/OE.17.014143


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Abstract

This work proposes a simple method, based on the crystal rotation technique and heterodyne interferometry, to simultaneously determine the pretilt angle and cell gap of nematic liquid crystal cells. When heterodyne light passes through a nematic liquid crystal cell, the phase retardation given by the characteristic parameters of the cell can be measured accurately by heterodyne interferometry. This phase retardation relates to the pretilt angle, cell gap, and angle of incidence on the cell. By using the measured phase retardations at two incident angles, the pretilt angle and cell gap of the nematic liquid crystal cell can be estimated by numerical analysis. This method is feasible, requiring only two incident angles and prior knowledge of two characteristic parameters—extraordinary and ordinary refractive indices of the liquid crystal. It is characterized by the advantages of simplicity of installation, ease of operation, high stability, high accuracy, and high resolution.

© 2009 OSA

ToC Category:
Optical Devices

History
Original Manuscript: May 18, 2009
Revised Manuscript: July 20, 2009
Manuscript Accepted: July 22, 2009
Published: August 3, 2009

Citation
Kun-Huang Chen, Wei-Yao Chang, and Jing-Heng Chen, "Measurement of the pretilt angle and the cell gap of nematic liquid crystal cells by heterodyne interferometry," Opt. Express 17, 14143-14149 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-16-14143


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References

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  2. B. L. Van Horn and H. H. Winter, “Analysis of the conoscopic measurement for uniaxial liquid-crystal tilt angles,” Appl. Opt. 40(13), 2089–2094 (2001). [CrossRef]
  3. S. J. Hwang, S. T. Lin, and C. H. Lai, “A novel method to measure the cell gap and pretilt angle of a reflective liquid crystal display,” Opt. Commun. 260(2), 614–620 (2006). [CrossRef]
  4. I. Dahl, “How to measure the Mueller matrix of liquid-crystal cells,” Meas. Sci. Technol. 12(11), 1938–1948 (2001). [CrossRef]
  5. M. H. Smith, “Method and apparatus for determining liquid crystal cell parameters from full Mueller matrix measurements,” US patent No. 7218398 (2007).

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