Lu Yuying, Li Tengteng, Yang Maosheng, Yao Haiyun, Liang Lanju, Yan Xin, Lv Kai Kai, Wang Meng, Yang Qili, Wei Chaoyang, Shao Jianda, Yao Jianquan
Precision Optical Manufacturing and Testing Centre, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, 201800, PR China.
Key Laboratory for High Power Laser Material of Chinese Academy of Sciences, Shanghai Institute of Optics and Fine Mechanics, Shanghai, 201800, PR China.
Nanoscale. 2022 Sep 15;14(35):12703-12712. doi: 10.1039/d2nr00292b.
The phenomenon of multi-resonant Fano resonances is important for the design of biosensors and communication fields. There are very few studies reporting the multi-band Fano resonance metamaterials with more than three resonance frequencies, or the tunable optical metamaterials to control the multi-band Fano resonance characteristics. Here, we report dual control of multi-band Fano resonances with a metal-halide perovskite-integrated terahertz metasurface by lasers and an electrical field. By tuning the conductivity of the perovskite film on the metasurface, ultrasensitive optoelectronic modulation was achieved. The terahertz transmission amplitude exhibited increasing and decreasing stages. We analyzed the physical phenomena and found that capacitance effects and Fermi-level enhancement had significant roles in the optical- and electronic-modulation experiments. The resonant frequencies in the electronic modulation had broader frequency shifts and a higher and wider tunable modulation depth range. More importantly, the maximum modulation depth was as high as 197%, with a significant fluctuation in the amplitude and more unstable frequency shifts in the transmission spectra.
多共振法诺共振现象对于生物传感器和通信领域的设计至关重要。很少有研究报道具有三个以上共振频率的多波段法诺共振超材料，或者用于控制多波段法诺共振特性的可调谐光学超材料。在此，我们报道了通过激光和电场对集成金属卤化物钙钛矿的太赫兹超表面进行多波段法诺共振的双重控制。通过调节超表面上钙钛矿薄膜的电导率，实现了超灵敏的光电调制。太赫兹传输幅度呈现出增加和减少阶段。我们分析了物理现象，发现电容效应和费米能级增强在光调制和电调制实验中起着重要作用。电调制中的共振频率具有更宽的频移以及更高且更宽的可调调制深度范围。更重要的是，最大调制深度高达197%，传输光谱中的幅度有显著波动且频移更不稳定。
