Schematic Illustration of the Space-Time Metasurface Supporting One-Way Light Reflection (IMAGE)
Caption
An illustration showing the concept of a space-time phase modulated metasurface consisting of resonating dielectric nanoantennas operating in reflection mode. A travelling phase modulation in sinusoidal form is superposed on the designed phase gradient along the horizontal direction. Light impinging on the metasurface with frequency ω is converted to a reflecting beam with frequency ω-Δω due to the parametric process arising from dynamic phase modulation, while the backpropagating beam with frequency ω-Δω is converted to ω -2Δω instead of ω, resulting in a nonreciprocal effect
Credit
by Xuexue Guo, Yimin Ding, Yao Duan, and Xingjie Ni
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License
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