Azobenzene liquid-crystalline polymer for optical switching of grating waveguide couplers with a flat surface
Azobenzene liquid-crystalline polymer for optical switching of grating waveguide couplers with a flat surface
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DOI：
10.1002/marc.200700041
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发表时间：
2007-05-02
影响因子：
4.6
通讯作者：
Ikeda, Tomiki
中科院分区：
文献类型：
--
作者：
Bang, Chong-Uk;Shishido, Atsushi;Ikeda, Tomiki
使用 488 nm 的 Ar+ 激光束通过全息光刻在偶氮苯液晶聚合物薄膜上制造了具有平坦表面的光栅波导耦合器。当633 nm的探测光束入射到光栅波导耦合器的一个光栅时，光束在波导中传播，输出光束从另一光栅输出，耦合效率接近5%。当用紫外光照射两个光栅之间的薄膜以引起偶氮苯部分的反式-顺式光异构化时，输出光束的强度被反复切换。结果发现，366 和 436 nm 的交替照射会引起引导探测光束强度的可逆变化。
Grating waveguide couplers with a flat surface were fabricated in an azobenzene liquid-crystalline polymer film by holographic lithography using Ar+ laser beams at 488 nm. When a probe beam at 633 nm was incident to one grating of a grating waveguide coupler, the beam propagated in the waveguide and an output beam came out from the other grating with the throughput coupling efficiency of approximate to 5%. Upon irradiation of the film between two gratings with UV light to cause trans-cis photoisomerization of the azobenzene moiety, the intensity of the output beam was repeatedly switched. It was found that the alternating irradiation at 366 and 436 nm induced reversible changes in the intensity of the guided probe beam.