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
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。
探测器 胆甾相液晶胶囊 三维多孔石墨烯 太赫兹探测器 可视化探测 光学学报
2020, 40(17): 1704002
Author Affiliations
Abstract
1 College of Electronic and Optical Engineering & College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
2 National Laboratory of Solid State Microstructures, Key Laboratory of Intelligent Optical Sensing and Manipulation, and College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China
We demonstrate a tunable terahertz (THz) absorber based on an indium tin oxide (ITO) metamaterial. The upper ITO cross-shaped metasurface with different arm lengths is fabricated by direct femtosecond laser etching. The thickness of the middle dielectric layer is only 60 μm, which makes the absorber very transparent and flexible. The experimental results show that the THz resonant peaks have a high performance near 1 THz. By setting spacers of different thicknesses between the middle layer and the ITO mirror, a new type of tunable THz absorber is proposed. Its absorption peak frequency can be continuously adjusted from 0.92 to 1.04 THz between TE and TM polarization. This transparent THz metamaterial absorber is expected to be widely used in THz imaging, sensing, and biological detection.
tunable terahertz absorber transparent metamaterial flexible metamaterial Chinese Optics Letters
2020, 18(9): 092403
