| Summary: | 碩士 === 國立交通大學 === 照明與能源光電研究所 === 107 === Metasurface has been applied to control the phase of light lately, including beam steering, focusing, generating optical angular momentum, and chirality, etc. Here, we report the complete studies of metasurfaces in reflectors and absorbers which could display the various optical phenomena under circularly polarized light at normal incidence. For the proposed chiral selective metasurface, the circular dichroism in reflection is about 0.4 which could be experimentally observed in the visible wavelengths. The experimental results also show high reflectance in right-handed circular polarization with preserved handedness and strongly absorption in left-handed circular polarization at chiroptical resonant wavelengths. By combining the nanobricks and the wire gratings, we propose a new method of the phase superposition in the same plane of metasurfaces. The method is helpful to further design the chiral selective metasurface effectively, and could advance in the development of ultracompact optical components in future.
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