太赫兹辐射
材料科学
涂层
吸收(声学)
光电子学
石墨烯
反射(计算机编程)
极化(电化学)
传输(电信)
光学
纳米技术
电信
物理
物理化学
复合材料
化学
计算机科学
程序设计语言
作者
Jiahao Ge,Yaqiang Zhang,Hongxing Dong,Long Zhang
出处
期刊:ACS applied nano materials
[American Chemical Society]
日期:2022-04-12
卷期号:5 (4): 5569-5577
被引量:21
标识
DOI:10.1021/acsanm.2c00531
摘要
Achieving absorption–transmission switchable devices is still a great challenge due to the complex competitions among absorption, reflection, and transmission. Here, we propose a nanolayered terahertz (THz) metasurface exhibiting switchable functionality from quad-band near-perfect absorption to strongly enhanced transmission. The switchable performances are attributed to the electrical tunability of graphene and insulator–metal transition in vanadium dioxide (VO2). When VO2 functions as a metal, the proposed metasurface performs as a quad-band perfect absorber. The four absorption peaks can be effectively adjusted by altering the related graphene Fermi energy levels. When VO2 is in an insulating state, the proposed device functions as a THz antireflection coating, which diminishes reflection and substantially enhances transmission. In addition, a theoretical interference model is employed to clarify the physical mechanisms behind the near-perfect absorber and antireflection coating. The obtained theoretical results significantly agree with the numerical simulations. Furthermore, owing to the rotationally symmetric patterns, the performances of both the quad-band perfect absorber and antireflection coating are rather insensitive to light polarization and angle of incidence. Hence, our results can facilitate the progress of nanoscale switchable metadevices in the THz regime.
科研通智能强力驱动
Strongly Powered by AbleSci AI