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High-efficiency broadband metasurface with silicon nanoantenna in visible spectrum

The metasurface based on dielectric nanoantennas has lower ohmic losses than its counterpart with metallic nanoantennas. Here by utilizing coupled leaky mode theory(CLMT), the resonance mode of the unit cell composed of rectangular silicon nanorods with variable geometric parameters is proposed and then theoretically analyzed. Based on the array of unit cells, a silicon metasurface with the properties of broadband around 97.17 THz and high transmission efficiency over 70% are achieved at the frequency range from 400THz to 660THz. Furthermore, a new strategy is proposed and then adopted in this paper to alleviate the crosstalk between the adjacent cells. Owing to the characteristic of broadband resonance and linear phase modulation, the metasurface with the silicon nanoantennas could hold a great potential for flat optical devices in the visible frequency range.