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Laser-induced orientational change of nematic liquid crystalline molecules mediated by photochromic reactions of surface azobenzenes |
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| Authors: | Yuji Kawanishi Yasuzo Suzuki Masako Sakuragi Hisamitsu Kamezaki Kunihiro Ichimura |
| Affiliation: | National Institute of Materials and Chemical Research, 1-1 Higashi, Tsukuba, Ibaraki 305 Japan Engineering Research Laboratory, Hitachi Maxell Ltd., 6-20-1 Kinunodai, Yawara-mura, Tsukuba-gun, Ibaraki 300-24 Japan Research Laboratory of Resources Utilization, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku Yokohama 227 Japan |
| Abstract: | The alignment of nematic liquid crystalline (LC) molecules with respect to the LC cell surface was regulated between the homeotropic (H) state and the parallel (P) state by the photochromic trans—cis isomerization of surface-attached azobenzene (Az) moieties. By bringing the angular-selective photoreaction into the system, the orientational order in the P state was significantly improved to attain a universal orientational axis over the entire irradiated area, which was rotatable and erasable photochemically. Laser pulse experiments revealed that the allignment relaxation time τ was reduced from 1000 to 30 ms by increasing the pulse intensity from 10 to 20 mJ cm−2. Strong coupling between the LC and Az molecules was indicated. |
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