Measurement of the Stokes vector based on a twisted nematic liquid crystal

doi:10.16511/j.cnki.qhdxxb.2016.22.010

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Abstract The Stokes vector contains complete polarization information. Traditional measurements of the Stokes vector have commonly used a rotating polarizer, but this method cannot be used in real time. This paper presents a fast measurement method based on a twisted nematic (TN) liquid crystal and a polarizer. Light with the known polarization state is used to calibrate the device by calculating the first line of the Mueller matrix for the device. Then, the Stokes vector of the incident light is obtained by applying different voltages to the TN liquid crystal. The method is tested by measuring the incident angle of natural light reflected by a dielectric. The tested incident angles are 10°-70° with every 10° tested once. The results are 8.54°, 18.47°, 27.09°, 38.93°, 47.86°, 60.27°, and 70.89°. Thus, this method has similar accuracy to a rotating polarizer.

Keywords optical measurement polarization twisted nematic (TN) liquid crystal Stokes vector degree of polarization polarization imaging

ZTFLH:	TN247
	TH744
	O436.3

Issue Date: 15 February 2016

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	ZHENG Jun
	DING Qiushi

Cite this article:

ZHENG Jun,DING Qiushi. Measurement of the Stokes vector based on a twisted nematic liquid crystal[J]. Journal of Tsinghua University(Science and Technology), 2016, 56(2): 206-210.

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http://jst.tsinghuajournals.com/EN/10.16511/j.cnki.qhdxxb.2016.22.010 OR http://jst.tsinghuajournals.com/EN/Y2016/V56/I2/206

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