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Optical isolators are devices that allow for unidirectional light transmission. We propose an integrated optical isolator by exploiting photonic spin-orbit interaction and graphene's magneto-optical property. Numerical simulation shows its extinction ratio over 45 dB and insertion loss less than 12 dB near 1.55 μm.
Light carries both spin and orbital momentum. It is found recently that the spin and orbital properties are strongly coupled with each other when light is tightly confined to subwavelength waveguiding structures. Here we exploit this spin-orbit interaction to propose an on-chip photonic isolator.
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