Li Guibin, Wang Guocui, Zhang Yan, Shen Jingling, Zhang Bo
Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Advanced Innovation Center for Imaging Technology, Beijing Key Laboratory for Terahertz Spectroscopy and Imaging, Beijing Key Laboratory of Metamaterials and Devices, Department of Physics, Capital Normal University Beijing 100048 China
Beijing Engineering Research Center for Mixed Reality and Advanced Display, School of Optics and Photonics, Beijing Institute of Technology Beijing 100081 China.
Nanoscale Adv. 2023 Jan 9;5(3):756-766. doi: 10.1039/d2na00577h. eCollection 2023 Jan 31.
The combination of graphene and perovskite has received extensive research attention because its photoelectric properties are excellent for the dynamic manipulation of light-matter interactions. Combining graphene and perovskite with a metasurface is expected to effectively improve the metasurface device's performance. Here, we report a terahertz graphene-perovskite metasurface with a tunable resonance. Under 780 nm laser excitation, the device's THz transmission is significantly reduced, and the Fano resonance mode can be manipulated in multiple dimensions. We verify the experimental results using a finite-difference time-domain (FDTD) simulation. Graphene and perovskite interact strongly with the metasurface, resulting in a short-circuit effect, which significantly weakens the resonance intensity of the Fano mode. The photoinduced conductivity enhancement intensifies the short-circuit effect, reducing the THz transmission and resonance intensity of the Fano mode and causing the resonance frequency to redshift. Finally, we provide a reference value for applications of hybrid metasurface-based optical devices in a real environment by investigating the effect of moisture on device performance.
石墨烯和钙钛矿的组合受到了广泛的研究关注，因为其光电特性对于光与物质相互作用的动态操控而言十分优异。将石墨烯和钙钛矿与超表面相结合有望有效提升超表面器件的性能。在此，我们报道了一种具有可调谐共振的太赫兹石墨烯 - 钙钛矿超表面。在780 nm激光激发下，该器件的太赫兹传输显著降低，并且法诺共振模式能够在多个维度上被操控。我们使用时域有限差分（FDTD）模拟验证了实验结果。石墨烯和钙钛矿与超表面强烈相互作用，导致短路效应，这显著削弱了法诺模式的共振强度。光致电导率增强加剧了短路效应，降低了法诺模式的太赫兹传输和共振强度，并使共振频率发生红移。最后，我们通过研究湿度对器件性能的影响，为基于混合超表面的光学器件在实际环境中的应用提供了一个参考值。
