Physics – Optics
Scientific paper
2010-09-28
Journal of Modern Optics, Volume 57, Issue 17 October 2010 , pages 1603 - 1610
Physics
Optics
to be published in Journal of Modern Optics 20 pages, 6 figures
Scientific paper
10.1080/09500340.2010.515750
The dynamic response of a near infrared Ferroelectric Liquid Crystal based Mueller matrix ellipsometer (NIR FLC-MME) is presented. A time dependent simulation model, using the measured time response of the individual FLCs, is used to describe the measured temporal response. Furthermore, the impulse response of the detector and the pre-amplifier is characterized and included in the simulation model. The measured time-dependent intensity response of the MME is reproduced in simulations, and it is concluded that the switching time of the FLCs is the limiting factor for the Mueller matrix measurement time of the FLC-based MME. Based on measurements and simulations our FLC based NIR-MME system is estimated to operate at the maximum speed of approximately 16 ms per Mueller matrix measurement. The FLC-MME may be operated several times faster, since the switching time of the crystals depends on the individual crystal being switched, and to what state it is switched. As a demonstration, the measured temporal response of the Mueller matrix and the retardance of a thick liquid crystal variable retarder upon changing state is demonstrated.
Ellingsen Pål Gunnar
Kildemo Morten
Lindgren Mikael
Sandvik Aas Lars Martin
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