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.
Abnormal reflection is one of the most basic functions of metasurface and its efficiency is very important in practical application. The implementation of perfect anomalous reflection needs to meet both phase and amplitude requirements. However, due to the absorption loss of metal materials and transmission loss of dielectric materials, perfect abnormal reflection is difficult to be realized in optical frequency. Here, we propose a multi-layer all-dielectric metasurface structure, using the reflecting layer to reflect all of this energy back to meet the amplitude requirement of 100% reflectivity. As proof of this concept, a 30° perfect anomalous reflector at 1550 nm for TM polarized light is showed. It is worth noting that this approach is not limited to anomalous reflection but can be extended to more complex metasurface functions such as focusing.
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