title: Multi-Direction-Tunable Three-Dimensional Meta-Atoms for Reversible Switching between Midwave and Long-Wave Infrared Regimes.
abstract: We introduce an electromechanically tunable metasurface composed of an array of three-dimensional nanosplit-rings for reversible and large-range changes of optical characteristics in infrared (IR) regime. When a current is induced or withdrawn, each nanosplit ring in the surface can deform in multi directions and consequently become a closed (OFF) or an open (ON) state. Theoretical and experimental results manifest that, as the metasurface is dynamically manipulated between the ON and OFF states, the corresponding resonance absorption will reversibly switch between the long wave (around 10.4 μm) and midwave (around 6.3 μm) IR regimes, two key IR spectral windows, and the reversible relative reflection changes can reach up to 95%.
authors: National Key Laboratory of Science and Technology on Micro/Nano Fabrication, Institute of Microelectronics, Peking University , Beijing 100871, P. R. China.
authors: Yifei
authors: Y
authors: Mao
authors: National Key Laboratory of Science and Technology on Micro/Nano Fabrication, Institute of Microelectronics, Peking University , Beijing 100871, P. R. China.
authors: Yini
authors: Y
authors: Pan
authors: College of Engineering and Applied Sciences, Nanjing University , Nanjing, Jiangsu 210093, P. R. China.|National Laboratory of Solid State Microstructures, Nanjing University , Nanjing, Jiangsu 210093, P. R. China.
authors: Weihua
authors: W
authors: Zhang
authors: Electron Microscopy Laboratory, Peking University , Beijing 100871, P. R. China.
authors: Rui
authors: R
authors: Zhu
authors: Electron Microscopy Laboratory, Peking University , Beijing 100871, P. R. China.
authors: Jun
authors: J
authors: Xu
authors: National Key Laboratory of Science and Technology on Micro/Nano Fabrication, Institute of Microelectronics, Peking University , Beijing 100871, P. R. China.|Innovation Center for MicroNanoelectronics and Integrated Systems, Beijing 100871, P. R. China.
authors: Wengang
authors: W
authors: Wu
keywords: Tunable metasurface; broad band switching; focused ion beam; multidirecitional rotation; three-dimensional nanosplit-ring resonator