Abstract
In this paper, several novel spin-selected metalenses composed of rotary silicon nanobrick array have been designed and numerically investigated at the telecommunication wavelength of 1500 nm, which can be focused at different positions along transverse or longitudinal direction for different spin light. They can not only directly distinguish the spin states but also manipulate photons with different spin states. Our optimized silicon nanobricks with varying orientation angles can achieve 98% cross-polarized transmitted efficiency, and possess Pancharatnam–Berry phase. Furthermore, a spin-independent metalens has also been designed, which can be well focused at the same spot for the light with different spin states. Our work opens up new avenues toward establishing novel spin-related metadevices, and it is significant for the development of functionality switchable optical devices and spin photonics.
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