Optical recording using smectic layer rotation in ferroelectric liquid crystal

Nakayama, Keizo; Ohtsubo, Junji; Ozaki, Masanori; Yoshino, Katsumi
April 2002
Applied Physics Letters;4/8/2002, Vol. 80 Issue 14, p2439
Academic Journal
Optical recording in a ferroelectric liquid crystal using smectic layer rotation induced by the application of asymmetric voltage pulses has been proposed. This recording method is based on the temperature dependence of the rotation rate and the fact that the rate in the smectic A (SmA) phase is considerably smaller than that in the chiral smectic C (SmC[sup *]) phase. The transition from the SmC[sup *] to the SmA phase can be induced by the photothermal effect. The application of asymmetric voltage pulses during partial laser irradiation results in the patterning of the layer alignment. This recording method can erase and invert the stored pattern and can handle gray-level patterns. © 2002 American Institute of Physics.


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