Optical coatings are enabling technology for modern optical systems, they are almost applied on every surface of the optical components. However, due to the uniform structure of the optical coatings, optical coatings have limited capability manipulating electromagnetic characteristics. Optical metasurfaces can locally manipulate optical field and enhance light–matter interactions, thus offering fascinating possibilities to control various properties of light, such as amplitude, phase, and polarization. While many new physical effects and applications were demonstrated based on metasurfaces, their practical application still faces challenges of low optical efficiency. Here, we propose the quasi-three-dimensional subwavelength structures, consisting of optical coatings and metasurfaces, to promote the efficiency of metasurfaces. We will present our recent advances in high-efficiency quasi-three-dimensional subwavelength structure devices. Our results pave the way to realizing optical meta-devices facing strict efficiency requirements in realistic applications.
Polarization beam splitter is an important part of many optical systems. The polarization beam splitter based on meta surface has the advantages of high efficiency, large splitting angle, wide bandwidth and easy fabrication. Here, we propose a double-layer Metal-Dielectric-Metal (MDM) structure. Through the periodic arrangement of metal nano bricks, the length and width in the nano brick are used to realize the independent control of the reflection phase of the orthogonally polarized light. The top and lower antennae are in charge of the anomalous reflection in the VIS and NIR spectral band, respectively, which render an ultra-broadband polarization beam splitting meta surface with a spectral bandwidth of 500-1400 nm, exhibiting an average anomalous reflection efficiency over 60 %. We hope that our design can provide a new solution for the realization of ultra-broadband beam splitter based on meta surface.
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