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Abstract
A new Raman microspectroscope was designed for the study of thin liquid-crystalline films in glass cells. This system is based on a confocal geometry and a multi-channel liquid nitrogen cooled CCD detector. The confocal arrangement makes possible the study of volumes only a few μm3 in size within a liquid-crystal cell with an axial resolution of 7 μm. The mutli-channel detector allows high quality spectra to be recorded in less than a second with only a few milliwatts of laser power at the sample. Using an electro-optic modulator, dynamic studies can be done on the millisecond scale or smaller. We present the first results obtained with this technique of the electrical switching of a ferroelectric liquid-crystalline low molar mass organosiloxane material.
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