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Gap-plasmon-driven spin angular momentum selection of chiral metasurfaces for intensity-tunable metaholography working at visible frequencies
Nanophotonics ( IF 6.5 ) Pub Date : 2022-05-16 , DOI: 10.1515/nanoph-2022-0075
Younghwan Yang 1 , Hongyoon Kim 1 , Trevon Badloe 1 , Junsuk Rho 1, 2, 3, 4
Affiliation  

Tunable metasurfaces can replace conventional bulky active optical modules to realize practical flat optical devices such as lenses, LiDAR, holography, and augmented reality. However, tunable metasurfaces have generally been limited to switching between two distinct states. Here, we present liquid crystal (LC) integrated chiral metasurfaces, of which the metahologram intensity can be adjusted continuously between fully ‘on’ and ‘off’ states. The chiral metasurface consists of a gap-shifted split ring resonator (SRR), and exhibits spin angular momentum selection that reflects left-circularly-polarized light but perfectly absorbs right-circularly-polarized light (99.9%). The gap-shifted SRR realizes spin angular momentum selection using a metal–dielectric–metal multilayer structure and thereby induces a strong gap-plasmonic response, achieving the maximum calculated circular dichroism in reflection (CDR) of 0.99 at the wavelength of 635 nm. With the chiral metasurface, metaholograms are demonstrated with tunable intensities using LCs that change the polarization state of the output light using an applied voltage. With the LC integrated chiral metasurfaces, 23 steps of polarization are demonstrated for the continuous tuning of the holographic image intensity, achieving measured CDR of 0.91. The proposed LC integrated spin-selective chiral metasurface provides a new resource for development of compact active optical modules with continuously-tunable intensity.

中文翻译:

手性超表面的间隙等离子体驱动自旋角动量选择,用于在可见频率下工作的强度可调超全息术

可调谐超表面可以替代传统笨重的有源光学模块,实现透镜、激光雷达、全息和增强现实等实用的平面光学器件。然而,可调超表面通常仅限于在两种不同状态之间切换。在这里,我们展示了液晶 (LC) 集成手性超表面,其中的超全息图强度可以在完全“开”和“关”状态之间连续调整。手性超表面由间隙位移裂环谐振器 (SRR) 组成,并表现出反射左圆偏振光但完美吸收右圆偏振光 (99.9%) 的自旋角动量选择。间隙位移 SRR 使用金属 - 电介质 - 金属多层结构实现自旋角动量选择,从而诱导强烈的间隙 - 等离子体响应,在 635 nm 波长处实现最大计算的反射圆二色性 (CDR) 为 0.99。借助手性超表面,使用 LC 以可调节强度展示超全息图,该 LC 使用施加的电压改变输出光的偏振态。使用 LC 集成的手性超表面,展示了 23 个偏振步骤,用于连续调整全息图像强度,实现 0.91 的测量 CDR。所提出的 LC 集成自旋选择性手性超表面为开发具有连续可调强度的紧凑型有源光学模块提供了新资源。使用施加电压改变输出光的偏振态的 LC 以可调节的强度展示了超全息图。使用 LC 集成的手性超表面,展示了 23 个偏振步骤,用于连续调整全息图像强度,实现 0.91 的测量 CDR。所提出的 LC 集成自旋选择性手性超表面为开发具有连续可调强度的紧凑型有源光学模块提供了新资源。使用施加电压改变输出光的偏振态的 LC 以可调节的强度展示了超全息图。使用 LC 集成的手性超表面,展示了 23 个偏振步骤,用于连续调整全息图像强度,实现 0.91 的测量 CDR。所提出的 LC 集成自旋选择性手性超表面为开发具有连续可调强度的紧凑型有源光学模块提供了新资源。
更新日期:2022-05-16
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