Active Controllable Light-Matter Interaction in the Flatland

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Ultrathin optical platform including two-dimensional materials and metasurfaces have emerged as potential candidates for novel nanophotonic applications. In this dissertation, I will present the possibility to achieve full active control of the electromagnetic waves with the platform in the flatland. We could achieve the amplitude control, which will be useful for absorbers and sensors, the spatial phase control, which might lead to holograms and flat lenses, and the temporal phase control, which would find use as frequency converter and isolator. 2D materials plasmonics using monolayer black phosphorus will be calculated and discussed to utilize the intrinsic anisotropic properties from black phosphorus. The extrinsic control by using metal antennas will also be shown in both simulations and experiments for realization of anisotropic absorption by treating black phosphorus as a semiconductor. I will cover the special patterning method using DNA-mediated nanoparticles, which will form the cornerstone to build the desired metasurfaces. By controlling the DNA length, the performance of the metasurfaces could be tuned to switch functionality. Active features of graphene and engineered phase control of metasurfaces will be discussed to fulfill time-varying metasurfaces. Two additional examples of the spectra control will be also discussed. One is to enhance the transmission through the gold nanoslits with the surface plasmons of graphene. The other is to build the dynamic absorber with phase transition materials vanadium dioxide by tuning the temperature. Then I will briefly show the possibility to combine the anisotropy in plane for the hyperbolic metasurfaces and the emerging inverse-design methods that will help for the flatland optical component designs.

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  • 10/21/2019
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