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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editor: Gregory W. Faris
  • Vol. 2, Iss. 9 — Sep. 26, 2007

Wavelength, temperature, and voltage dependent calibration of a nematic liquid crystal multispectral polarization generating device

Justin Shekwoga Baba and Philip Ryan Boudreaux  »View Author Affiliations


Applied Optics, Vol. 46, Issue 22, pp. 5539-5544 (2007)
http://dx.doi.org/10.1364/AO.46.005539


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Abstract

Rapid calibration of liquid crystal variable retarder (LCVR) devices is critical for successful clinical implementation of a LC-based Mueller matrix imaging system being developed for noninvasisve skin cancer detection. For multispectral implementation of such a system, the effect of wavelength (λ), temperature (T), and voltage (V) on the retardance (δ) required to generate each desired polarization state needs to be clearly understood. Calibration involves quantifying this interdependence such that for a given set of system input variables ( λ , T ) , the appropriate voltage is applied across a LC cell to generate a particular retardance. This paper presents findings that elucidate the dependence of voltage, for a set retardance, on the aforementioned variables for a nematic LC cell: 253   mV / 100   nm λ-dependence and 10 mV / ° C T-dependence. Additionally, an empirically derived model is presented that enables initial voltage calibration of retardance for any desired input wavelength within the calibration range of 460 905   nm .

© 2007 Optical Society of America

OCIS Codes
(120.5410) Instrumentation, measurement, and metrology : Polarimetry
(160.3710) Materials : Liquid crystals
(230.2090) Optical devices : Electro-optical devices
(230.3720) Optical devices : Liquid-crystal devices
(230.5440) Optical devices : Polarization-selective devices
(260.5430) Physical optics : Polarization

ToC Category:
Optical Devices

History
Original Manuscript: March 9, 2007
Revised Manuscript: May 30, 2007
Manuscript Accepted: June 4, 2007
Published: July 31, 2007

Virtual Issues
Vol. 2, Iss. 9 Virtual Journal for Biomedical Optics

Citation
Justin Shekwoga Baba and Philip Ryan Boudreaux, "Wavelength, temperature, and voltage dependent calibration of a nematic liquid crystal multispectral polarization generating device," Appl. Opt. 46, 5539-5544 (2007)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=ao-46-22-5539


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