In the paper, we propose a multi-functional microwave device to realize the polarization conversion of transport waves based on the anisotropic metasurface which is composed of a series of flower-liked unit cells separated by air space. The simulation results show that the metasurface would convert the polarization state of the incident electromagnetic wave to the cross-polarization state in the frequency region of 7.2~8.8 GHz and the linear polarization (LP) state to circular polarization (CP) state from 8.8 GHz to 11.1 GHz. The conversion efficiency of cross-polarization conversion (CPC) for LP wave is larger than 0.9 even for the incident angle of 85°, except for the narrower bandwidth. While the LP incident can efficiently convert to CP transmission wave for incident angle below 60°. The outstanding angular stability is originated from the symmetrical configuration of the designed unit cell. Additionally, the influences of structural parameters on the polarization conversion are studied in detail.
Organic-inorganic perovskite is an emerging material possessing potential applications in solar cell, light-emitting diodes, and photodetectors due to its intrinsic features. High absorption coefficient, as an important parameter, is beneficial to the photo-electrical conversion efficiency and the relevant issues. Therefore, how to further improve the absorption is a meaningful topic. In this work, we turn to the nano-surface engineering to realize great absorption. Concretely, the self-assembled truncated spherical nanovoids are arranged on the surface of the perovskite. In comparison with the planar perovskite film, the absorption coefficient is increased by 18% on average within 300 nm ~ 800 nm wavelength region and a wide incident angle range. The improvement is originated from the special arrangement of effective dielectric constants which can be verified by multilayer effective media theory. This finding paves a way of improving the absorption of perovskite at the scales between the wavelength (perovskite-based gratings) and the quantum (perovskite with quantum dot doping). Moreover, the relevant research has been pointed out that the structured perovskite films have better pressure resistance.
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