Abstract
Asymmetric optical systems have been actively researched in various applications in terms of products and services in optical communication and diffractive optics technologies. Among the various methods for achieving optical asymmetry, using metasurfaces are quite suitable because of their high-compactness. In this paper, a polarization-independent metasurface for asymmetric optical diffraction is proposed by using a checkerboard pattern of two-types of nanohole structures. The key principle for asymmetric optical diffraction is an optimal design of effective optical period, which can be achieved by tuning the cavity-aperture geometry. The proposed structure shows asymmetric diffraction properties without complicated multilayer structure. We expect that the proposed asymmetric diffractive metasurface has great potential for polarization-independent miniaturized asymmetric optical diffraction systems or asymmetric Janus holographic imaging in the near-infrared region.
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