Complex Reflectivity Modulation Characteristics at Visible Wavelength Using Liquid Crystal on a Metasurface Device

IF 3.7 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Yong-Hae Kim, Kyunghee Choi, Jaehyun Moon, Jong-Heon Yang, Jae-Eun Pi, Ji-Hun Choi, Chi-Sun Hwang, Jeong-Seon Yu, Jong-Hyun Kim
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Abstract

Active metasurface device capable of complex modulation in the visible light range is demonstrated. To realize complex modulation, a liquid crystal (LC) of twisted nematic mode on a plasmonic antenna metasurface, where resonance wavelength is sensitive to its geometry and nearby optical environment, is integrated. For the LC process on the metasurface, the alignment characteristics of the material exposed to the LC on the metasurface are first identified and the polyimide alignment layer is omitted. The LC works in twisted nematic mode to enhance complex modulation characteristics. The complex reflectivity coefficient is measured while varying the voltage applied to both the antenna and metal electrode in the visible light region. Complex reflectivity into a doughnut shape with a small voltage variation of 3.1 V on the antenna electrode and 2.5 V on the metal electrode is successfully modulated. The largest complex modulation is achieved at a wavelength of 660 nm, with phase and reflectivity amplitude modulations of 0–2π radian in a doughnut shape and 0.3 and 0.6, respectively. So far true holographic experience is limited by high-order overlapping and twin images. Through this approach, a technical method is suggested for overcoming such obstacles and accomplishing advanced holographic display.

Abstract Image

在超表面器件上使用液晶的可见波长复杂反射率调制特性
展示了一种能够在可见光范围内进行复杂调制的有源超表面器件。为了实现复杂调制,在等离子体天线超表面上集成了一个扭曲向列模液晶(LC),该液晶的共振波长对其几何形状和附近的光学环境敏感。对于超表面上的LC工艺,首先识别暴露在超表面上LC的材料的对准特性,并省略聚酰亚胺对准层。LC工作在扭曲向列模式,以提高复杂调制特性。在天线和金属电极的可见光区分别施加不同的电压,测量复合反射率系数。复合反射率被成功调制成甜甜圈形状,天线电极上的电压变化很小,为3.1 V,金属电极上为2.5 V。在660 nm波长处实现了最大的复合调制,相位和反射率振幅调制分别为0-2π弧度,为甜甜圈形状,分别为0.3和0.6。到目前为止,真正的全息体验受到高阶重叠和孪生图像的限制。通过这种方法,提出了克服这些障碍,实现先进全息显示的技术方法。
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