Proceedings PaperIntensity ratio alignment technique in photoelastic modulation ellipsometry and polarimetry
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The concept of intensity ratio alignment technique will be introduced by comparing it with the conventional null technique. For in situ/real time monitoring the plasma etching process, we will introduce a fixed incident angle alignment technique for a photoelastic modulation ellipsometer. In addition to ellipsometry, we will introduce a photoelastic modulation polarimetry to measure the twisted angle and phase retardation of a twisted nematic liquid.