A double-flipped asymmetric silicon metasurface in a multimode waveguide converts the forward fundamental mode to a higher-order mode while reflecting the backward fundamental mode, giving reciprocal unidirectional reflection.
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Broadband Low-loss Unidirectional Reflection On-chip with Asymmetric Dielectric Metasurface
A double-flipped asymmetric silicon metasurface in a multimode waveguide converts the forward fundamental mode to a higher-order mode while reflecting the backward fundamental mode, giving reciprocal unidirectional reflection.