Electrically switchable and thermally erasable biphotonic holographic gratings in dye-doped liquid crystal films

Lee, C.-R.; Mo, T.-S.; Cheng, K.-T.; Fu, T.-L.; Fuh, A. Y.-G.
November 2003
Applied Physics Letters;11/24/2003, Vol. 83 Issue 21, p4285
Academic Journal
This study investigates high-resolution photoinduced biphotonic holographic gratings in azo-dye-doped liquid crystal films. A biphotonic grating (BG) is formed under the illumination of one linearly polarized green light with the simultaneous irradiation of an interference pattern created by two linearly polarized red lights. This study ascribes the formation of this grating to two mechanisms. One mechanism is the green-light-inducing strong dye absorption followed by adsorption through the trans–cis isomerization; the other mechanism is the inhibition effect of adsorption induced by the red light through the cis–trans inverse isomerization. These produce a twisted nematic structure-modulated pattern, which, in turn, causes the BG. Additional experiments demonstrate that the formed BGs are electrically switchable and thermally erasable. © 2003 American Institute of Physics.


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