Polymer network cholesteric liquid crystal operating in the near infrared

A Polymer Stabilized Cholesteric Texture (PSCT) material operating in the n ear infrared can be used to modulate the infrared spectrum. We emphasize on the electrooptical behavior of such materials and especially on the study of parameters such as the prepolymer concentration or the UV intensity on t he quality of the response. The influence of these parameters is discussed, The amplitude of the modulation with the liquid crystal pitch and the thic kness of the active layer is also investigated. An important modulation is obtained in the range investigated (up to 3 microns).