首页> 外文期刊>Photonics Technology Letters, IEEE >Polarization-Independent Liquid-Crystal Fresnel Lenses Based on Surface-Mode Switching of 90 Twisted-Nematic Liquid Crystals
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Polarization-Independent Liquid-Crystal Fresnel Lenses Based on Surface-Mode Switching of 90 Twisted-Nematic Liquid Crystals

机译:基于90向扭曲向列液晶的表面模式转换的偏振无关液晶菲涅耳透镜

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A simple polarization-independent liquid-crystal Fresnel lens is developed using the surface-mode switching of 90$^{circ}$ twisted-nematic liquid crystals (TN-LCs). In the surface-mode switching of LCs, the major reorientation of LCs occurs near the substrates. Optical calculations indicate that 90$^{circ}$ TN-LCs are polarization-independent under surface-mode switching, when the applied voltage exceeds four times the threshold voltage for director reorientation. The maximum tunable phase shift in this polarization-independent state of 90$^{circ}$ TN-LCs is $sim$ 11% of LC cell retardation. An LC Fresnel lens that is polarization-independent and has a fast response with a response time of $≪$10 ms is demonstrated using the surface-mode switching of 90$^{circ}$ TN-LC.
机译:一个简单的偏振无关液晶菲涅耳透镜是利用90°扭曲向列液晶(TN-LC)的表面模式切换而开发的。在LC的表面模式切换中,LC的主要重新定向发生在基板附近。光学计算表明,当施加的电压超过指向矢重定向方向的阈值电压的四倍时,在表面模式切换下90%TN-LCs是偏振无关的。在这种不依赖极化的状态下,最大可调谐相移为90%TN-LC,仅相当于LC细胞延迟的11%。使用90 $ ^ circ TN-LC的表面模式切换,演示了偏振无关的LC菲涅尔透镜,响应速度为$≪ $ 10 ms,具有快速响应。

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