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In order to realize unidirectional optical transmission (UOT), a single-layer metallic grating (SMG) consisting of cambered resonators (CRs) is proposed. Numerical simulation results show that the transmittance contrast ratio of the SMG can reach about 5000 with a high unidirectional transmittance of 39%. UOT results from diffraction enhancement or suppression in transmission direction. Diffraction is manipulated by the interference of electromagnetic radiation from local surface plasmons on CRs. Our single-layer structure has sub-100 nm thickness and can be used in ultracompact optical devices to manipulate light transmission.

Unidirectional Optical Transmission in a Single-Layer Metallic Grating Consisting of Cambered Resonators