Active Full‐Color Generation Based on a Liquid Crystal‐Integrated Plasmonic Metasurface

IF 3.7 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Advanced Photonics Research Pub Date : 2024-07-09 DOI:10.1002/adpr.202300334
Dewang Huo, Guoqiang Li
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Abstract

Structural colors based on metasurfaces outperform traditional pigments and dyes in terms of nonfading, high spatial resolution, and high stability, usually incorporating active materials for tunability. Liquid crystals (LCs) are suitable for tunable structural color design due to their large birefringence and fast modulation by external stimuli. However, most LC‐integrated structural colors focus on tailoring the polarization angle of incident light to generate two colors and their mixing. Herein, a scheme of full‐color generation based on a plasmonic metasurface integrated with LCs utilizing the combination of the polarization angle rotation effect of the twisted‐nematic LCs and the refractive index modulation through the realignment of the LCs near the metasurface is demonstrated. Based on the proposed structural color method, full‐color generation of a record color gamut of 60.7% standard Red Green Blue region, equivalent to 43% National Television Standards Committee area, in the LC‐integrated metasurface, has been numerically realized by tuning the bias voltage of the LCs in reflection. The achieved color gamut is nearly 4 times wider than the previously reported result. The proposed active full‐color generation metasurface shows great potential in applications for low‐power reflective color display, anticounterfeiting, and optical encoding.
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基于液晶集成等离子体元表面的有源全彩发生器
基于超表面的结构色彩在不褪色、高空间分辨率和高稳定性方面优于传统颜料和染料,通常还包含可调活性材料。液晶(LC)具有较大的双折射和快速受外部刺激调制的特性,因此适合用于可调结构色设计。然而,大多数集成了液晶的结构颜色都侧重于调整入射光的偏振角,以产生两种颜色及其混合。在此,我们展示了一种基于集成了 LC 的等离子体元表面的全色生成方案,该方案利用了扭曲向列 LC 的偏振角旋转效应和通过元表面附近 LC 的重新配置实现的折射率调制效应。基于所提出的结构色彩方法,通过在反射过程中调整 LC 的偏置电压,在 LC 集成的元表面上全彩生成了 60.7% 标准红绿蓝区域的创纪录色域,相当于 43% 的国家电视标准委员会区域。所实现的色域比之前报告的结果宽近 4 倍。所提出的有源全彩生成元表面在低功耗反射式彩色显示、防伪和光学编码等应用中显示出巨大的潜力。
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