Photochemical image storage in polymer liquid crystals (Invited Paper)

Tomiki Ikeda

doi:10.1117/12.60391

15 June 1992 Photochemical image storage in polymer liquid crystals (Invited Paper)

Tomiki Ikeda

Proceedings Volume 1665, Liquid Crystal Materials, Devices, and Applications; (1992) https://doi.org/10.1117/12.60391
Event: SPIE/IS&T 1992 Symposium on Electronic Imaging: Science and Technology, 1992, San Jose, CA, United States

Abstract

Image storage into polymer liquid crystals (PLCs) on the basis of an isothermal phase transition is presented. Photochromic guest molecules are incorporated into PLCs just physically or covalently at concentrations below several mole and irradiated so as to bring about a photoisomerization. In the case where azobenzenes are used as guests, a trans-cis photoisomerization caused by photoirradiation acts as a trigger to induce nematic (N) to isotropic (I) phase transition at the irradiated sites owing to lowering of the N-I phase transition temperature (TNI) by accumulation of the sphere-like cis-form of the azobenzenes. This photochemical phase transition is reversible and the cis to trans isomerization restores the system to the initial state. The photochemical phase transition depends on such factors as temperature, structures of guests, and hosts. Guest molecules with high affinity to hosts induce the photochemical phase transition effectively and hosts with low order parameters are also effective for the phase transition. Unlike the response to electric field, PLCs show a similar photoresponsiveness to low-molecular-weight LCs.

Citation Download Citation

Tomiki Ikeda "Photochemical image storage in polymer liquid crystals (Invited Paper)", Proc. SPIE 1665, Liquid Crystal Materials, Devices, and Applications, (15 June 1992); https://doi.org/10.1117/12.60391

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