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首页> 外文期刊>Journal of Lightwave Technology >All-Optical and Polarization-Independent Tunable Guided-Mode Resonance Filter Based on a Dye-Doped Liquid Crystal Incorporated With Photonic Crystal Nanostructure
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All-Optical and Polarization-Independent Tunable Guided-Mode Resonance Filter Based on a Dye-Doped Liquid Crystal Incorporated With Photonic Crystal Nanostructure

机译：基于掺有光子晶体纳米结构的染料掺杂液晶的全光和偏振无关的可调导模谐振滤波器

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摘要

This work presents the design, fabrication, and characterization of a novel two-dimensional (2D) all-optical and polarization-independent tunable guided-mode resonance filter. This filter is composed of a 2D sub-wavelength photonic crystal nanostructure with a dye-doped liquid crystal layer in a doped-nanoparticle-induced homeotropic alignment. Experimental results show that the resonant wavelength of the filer can be all-optically and polarization-independently tuned for red- and blue-shifting if the cell is illuminated successively by UV and green beams. The all-optical and polarization-independent tunability of the filter is attributed to the phase transition between homeotropic (H) and isotropic (I) state, resulting in variations in the LC refractive index between the ordinary index (n(o)) and refractive index in I state (n(i)) via either UV-beam-induced trans-cis or green-beam-induced cis-trans back isomerization. In addition, the optically tunable cycle of the filter is repeatable for many times without significant decay or damage. This filter has potential applications, such as optical filters in signal processing, optical switches in communications technology, and optical sensors.
机译：这项工作介绍了新型的二维（2D）全光和偏振无关的可调导模谐振滤波器的设计，制造和表征。该滤光器由二维亚波长光子晶体纳米结构组成，在掺杂纳米颗粒诱导的垂直排列中具有染料掺杂的液晶层。实验结果表明，如果单元格被紫外线和绿光连续照射，则滤光片的共振波长可以进行全光和偏振无关的红移和蓝移。滤光片的全光学和偏振无关的可调性归因于垂直（H）和各向同性（I）状态之间的相变，导致普通折射率（n（o））和折射率之间的LC折射率发生变化通过紫外光诱导的反式顺式或绿光诱导的顺反式反异构化，使I指数（n（i））处于I状态。此外，滤光器的光学可调周期可以重复多次，而不会出现明显的衰减或损坏。该滤波器具有潜在的应用，例如信号处理中的光学滤波器，通信技术中的光学开关和光学传感器。

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