Abstract
In this paper, a long-range surface plasmon resonance (LRSPR) structure with antimonene is proposed to enhance the photonic spin Hall effect (PSHE). By exploiting the LRSPR with antimonene, the maximum transverse displacement of the incident beam with a wavelength of 633 nm can reach 121.4λ (76.9 µm), which is much larger than the previously reported value in the insulator-metal LRSPR structure. Given the high sensitivity of spin splitting to alterations in the refractive index of the sensing layer, PSHE finds application in sensors. Remarkably, the LRSPR structure featuring antimonene demonstrates a sensitivity of 7 × 104 µm/RIU, an order of magnitude higher than that of conventional SPR structures. These results present a promising avenue for integrating PSHE into biosensing applications.
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