A technique was developed and used to measure the rotatory power of 90°twisted nematic liquid crystals in the visible and infrared spectral regions. Experimental results for two liquid crystal mixtures, BDH-E7 and ZLI-1132, are in very good agreement with theoretical calculations for a wide spectral range and for different liquid crystal thicknesses. A quantitative relationship between liquid crystal birefringence, wavelength, and cell thickness was derived for use in the design of IR liquid crystal light valves with high contrast ratios and minimum response times.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)