BICs-enhanced active terahertz wavefront modulator enabled by laser-cut graphene ribbons  

作　　者：JIANZHOU HUANG BIN HU GUOCUI WANG ZONGYUAN WANG JINLONG LI JUAN LIU YAN ZHANG 

机构地区：[1]Beijing Engineering Research Center for Mixed Reality and Advanced Display,School of Optics and Photonics,Beijing Institute of Technology,Beijing 100081,China [2]Beijing Key Laboratory for Metamaterials and Devices,Key Laboratory of Terahertz Optoelectronics,Ministry of Education,and Beijing Advanced Innovation Center for Imaging Technology,Department of Physics,Capital Normal University,Beijing 100048,China

出　　处：《Photonics Research》2023年第7期1185-1195,共11页光子学研究（英文版）

基　　金：Beijing Municipal Natural Science Foundation (L223031);National Natural Science Foundation of China (61875010)。

摘　　要：Graphene-based terahertz(THz)metasurfaces combined with metallic antennas have the advantages of ultrasmall thickness,electrical tunability,and fast tuning speed.However,their tuning ability is limited by nonindependently tunable pixels and low modulation depth due to the ultra-small thickness of graphene.Here,we demonstrate a reconfigurable THz phase modulator with 5×5 independently tunable units enabled by switching the voltages applied on 10 graphene ribbons prepared by laser cutting.In addition,by introducing quasibound states in the continuum resonance through a designed double C-shaped antenna,the efficiency of the device is enhanced by 2.7–3.6 times under different graphene chemical potentials.Experimental results demonstrate that a focus can be formed,and the focal length is changed from 14.3 mm to 22.6 mm.This work provides potential for compact THz spatial light modulators that may be applied in THz communication,detection,and imaging.

关 键 词：MODULATOR tuning LASER 

分 类 号：TQ127.11[化学工程—无机化工] TN249[电子电信—物理电子学] O441.4[理学—电磁学]