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Optical tuning and switching of photonic defect modes in cholesteric liquid crystals

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5 Author(s)
Yoshida, Hiroyuki ; Department of Electrical, Electronic and Informational Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan ; Lee, Chee Heng ; Miura, Yusuke ; Fujii, Akihiko
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Optical tuning of photonic defect modes in cholesteric liquid crystals is demonstrated based on a contrast in the pitch length. Two-photon laser lithography was performed in a cholesteric helix to leave an unpolymerized region in the center to act as a structural defect. The unpolymerized region was then substituted by an azobenzene dye-doped cholesteric liquid crystal which exhibits a pitch shortening upon ultraviolet exposure. Reversible shifting or on-off switching of the defect mode was realized as a result of selectively inducing a pitch shortening of the cholesteric liquid crystal at the defect and changing the contrast in the pitch length between the bulk and defect.

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Applied Physics Letters  (Volume:90 ,  Issue: 7 )