摘要
提出了一种基于圆形与L形耦合的可调谐的太赫兹宽带吸收器。其主要结构由顶层的电可调石墨烯材料、中间的介质材料SiO_(2)和底层的金组成。通过COMSOL软件和多重反射干涉理论对器件的吸收光谱进行研究。结果表明:模拟与理论的吸收光谱高度重合。在保持狭缝的前提下,改变中央位置的石墨烯形状并不会改变吸收器的性能。当石墨烯的费米能级通过外加电压调节到0.95 eV时,器件处于强吸收(吸收率>90%)的频谱宽度超过了4.1 THz,且具有极化无关的特性。本设计在光开关、调制器和能量收集等领域具有潜在的应用价值,也给太赫兹宽带吸收器的设计提供更多的灵感。
We propose a tunable terahertz broadband absorber based on circular and L-shaped couplings.Its main structure is composed of an electrically tunable graphene material at the top,a dielectric material SiO_(2) in the middle,and gold at the bottom.The absorption spectra of this device are studied using the COMSOL software and the multiple reflection interference theory.The results show that the simulated and theoretical absorption spectra significantly overlap.On the premise of keeping the slit,changing the shape of the central graphene will not change the performance of the absorber.When the Fermi energy level of graphene is regulated to 0.95 eV by an applied voltage,the device is polarization independent and exhibits a strong absorption of more than 90% with a spectral width of more than 4.1 THz.This study will therefore have potential applications in optical switching,modulators,and energy harvesting,and it will provide further inspiration for the design of terahertz broadband absorbers.
作者
刘涛
程星鑫
周自刚
杨永佳
Liu Tao;Cheng Xingxin;Zhou Zigang;Yang Yongjia(School of Mathematics and Science,Southwest University of Science and Technology,Mianyang 621010,Sichuan,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2023年第13期282-290,共9页
Laser & Optoelectronics Progress
基金
四川省教研教改项目(JG2021-901)
国家自然科学基金(11875228)
西南科技大学省级大学生创新创业训练计划(S202210619105)
西南科技大学创新基金精准专项(JZ22-087)
西南科技大学数理学院创新基金(LX20210045,LX20210038)。
