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Photoactive photonic liquid crystal fiber polarization switches

机译:光敏光子液晶光纤偏振开关

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摘要

This study presents a light-controlled photonic liquid crystal fiber (PLCF) polarization switch. The solid-core PCF has an index-guiding effect that reduces the insertion loss produced by infiltrating liquid crystals (LCs) with a low refractive index (RI). The proposed approach achieves photoactive tuning through the trans-cis photoisomerization of doped azobenzene, which modulates the RI of infiltrated LCs. This design achieves an optically tunable extinction ratio of average 10 dB and photonic bandgap in the wavelength range of 1527-1538 nm under 30 mW laser illumination. The repeatable and switchable phase change is nearly 60°, corresponding to a response time of 100 ms, which is to date the fastest light-tunable PLCF polarization switch available.
机译:这项研究提出了一种光控光子液晶光纤(PLCF)偏振开关。实芯PCF具有折射率引导效果,该折射率减小了通过渗透具有低折射率(RI)的液晶(LC)而产生的插入损耗。所提出的方法通过掺杂的偶氮苯的反式-顺式光异构化来实现光活性调节,这调节了渗透LC的RI。此设计在30 mW激光照射下在1527-1538 nm波长范围内实现了平均10 dB的光学可调消光比和光子带隙。可重复和可切换的相变接近60°,对应于100 ms的响应时间,这是迄今为止最快的光可调PLCF偏振开关。

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