We have recently studied the physics and functionalities of metasurfaces in both reflective and transmissive geometries, with passive and actively tunable functionalities. In the first part, we first present a complete phase diagram to understand/predict the diversified and fascinating functionalities of metasurfaces in metal-insulator-metal (MIM) configuration , based on which we combined graphene with metasurface to achieve wide-range active THz phase modulation . We next describe our recent efforts to realize tunable metasurfaces in the microwave regime to realize dynamically-controllable functionalities . In the second part, we will describe our recent efforts to realize surface-plasmon-polariton (SPP) meta-couplers with very high efficiencies, based on gradient metasurfaces . Finally, we show that 100%-efficiency photonic spin-Hall effect (PSHE) can be realized in geometric-phase metasurfaces with meta-atoms satisfying certain criterions, which help us design microwave metasurfaces exhibiting nearly 100% PSHE efficiency in both reflection and transmission geometries .
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Lei Zhou, Qiong He, and Shulin Sun, "High-efficiency and tunable metasurfaces in reflective and transmissive geometries (Conference Presentation)," Proc. SPIE 10536, Smart Photonic and Optoelectronic Integrated Circuits XX, 1053609 (Presented at SPIE OPTO: January 29, 2018; Published: 14 March 2018); https://doi.org/10.1117/12.2293360.5751507503001.
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