Full-visible transmissive metagratings with large angle/wavelength/polarization tolerance
Zi‐Lan Deng, Xuan Ye, Hao-Yang Qiu, Qing‐An Tu, Tan Shi, Ze-Peng Zhuang, Yaoyu Cao, Bai‐Ou Guan, Naixing Feng, Guo Ping Wang, Polina Kapitanova, Andrea Alù, Jian‐Wen Dong, Xiangping Li
Abstract
Metagratings have been shown to form an agile and efficient platform for extreme wavefront manipulation, going beyond the limitations of gradient metasurfaces. Here, we present all-dielectric transmissive metagratings with high diffraction efficiencies using simple rectangular inclusions with neither high index nor high aspect ratio requirement. We further experimentally demonstrate continuous phase encoding of a hologram based on such transmissive metagratings through displacement modulation of CMOS-compatible silicon nitride nanobars in the full visible range, manifesting broadband and wide-angle high diffraction efficiencies for both polarizations. Featured with extreme angle/wavelength/polarization tolerance and alleviated structural complexity for both design and fabrication, our demonstration unlocks the full potential of metagrating-based wavefront manipulation for a variety of practical applications.