Teng-Man Method

The Teng - Man method can measure R33 as the sample is being poled. R33 is an elipsometric measurement[1]. A poling voltage is applied to the film while making the elipsometric measurements and looking for changes in the AC signal generated by incident light.
(This video is the replacement for the same title which was formerly split into two parts.)
More information on the CMDITR wiki:
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