Dielectric metasurfaces with spatially varying birefringence and hightransmission efficiency can exhibit exceptional abilities for controlling thephotonic spin states. We present here some of our works on spin photonics andspin-photonic devices with metasurfaces. We develop a hybrid-order Poincaresphere to describe the evolution of spin states of wave propagation in themetasurface. Both the Berry curvature and the Pancharatnam-Berry phase on thehybrid-order Poincare sphere are demonstrated to be proportional to thevariation of total angular momentum. Based on the spin-dependent property ofPancharatnam-Berry phase, we find that the photonic spin Hall effect can beobserved when breaking the rotational symmetry of metasurfaces. Moreover, weshow that the dielectric metasurfaces can provide great flexibility in thedesign of novel spin-photonic devices such as spin filter and spin-dependentbeam splitter.
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