光学学报, 2020, 40 (17): 1704002, 网络出版: 2020-08-25   

基于三维多孔石墨烯和胆甾相液晶胶囊的高效可视化太赫兹探测器 下载: 975次

High-Efficiency Visual Terahertz Detector Based on Three-Dimensional Porous Graphene and Cholesteric Liquid Crystal Microcapsule
作者单位
1 南京邮电大学电子与光学工程学院 微电子学院, 江苏 南京 210023
2 南京大学固体微结构物理国家重点实验室, 江苏 南京 210093
3 南京大学智能光传感与调控技术教育部重点实验室, 江苏 南京 210093
摘要
设计一种三维多孔石墨烯(3DPG)辅助胆甾相液晶胶囊(CLCM)的新型功率探测器,用于测量高强度THz波。3DPG在频率为0.5~1.5 THz时具有超过97%的高吸收率。利用温度超灵敏CLCM的热色特性,对稳态下的THz功率进行可视化定量研究,THz功率密度高达2.77×10 2 mW/cm 2,最低探测功率仅为0.009 mW。进一步研究发现,3DPG上溅射少量金纳米颗粒后,THz功率与CLCM的Hue值呈线性关系。该可视化探测器结构简单、便携、成本低廉、高效实用,可应用于THz系统的对准、THz波的光束分析及THz成像和传感中。
Abstract
This study design a novel power detector based on three-dimensional porous graphene (3DPG) and cholesteric liquid crystal microcapsule (CLCM) to measure high-intensity THz waves. The 3DPG is characterized by its high absorptivity, which is more than 97% at the frequency of 0.5-1.5 THz. The thermochromic properties of temperature-supersensitive CLCM are used for visual quantitative study of the THz power under steady state condition. The THz power intensity is as high as 2.77×10 2 mW/cm 2, where the minimal detectable THz power is only 0.009 mW. Further analysis reveals that there is a linear relationship between the THz power and the Hue value of the CLCM after the 3DPG is sputtered with a small amount of gold nanoparticles. The visual detector is simple, portable, inexpensive, efficient, and practically applicable. Further, it can be used in THz system alignment and beam analysis as well as THz imaging and sensing.

肖芮文, 肖俊羽, 金萍, 张荣轩, 王磊. 基于三维多孔石墨烯和胆甾相液晶胶囊的高效可视化太赫兹探测器[J]. 光学学报, 2020, 40(17): 1704002. Ruiwen Xiao, Junyu Xiao, Ping Jin, Rongxuan Zhang, Lei Wang. High-Efficiency Visual Terahertz Detector Based on Three-Dimensional Porous Graphene and Cholesteric Liquid Crystal Microcapsule[J]. Acta Optica Sinica, 2020, 40(17): 1704002.

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