Manipulating photonic spin Hall split based on nonlinear effect and surface plasmon resonance.

In this work, we present a surface plasmon resonance (SPR) structure containing AuAl 2 and a nonlinear Kerr medium. Based on the modulation of the refractive index of the Kerr medium by pumped light, we analyze the effects of the SPR structure and pumped light on the photonic spin Hall effect (PSHE). The numerical results indicate that the thickness of the AuAl 2 exerts a profound impact on the SPR, while the intensity of the pump light (I p) exerts a significant influence on the resonance angle. The transverse shift (TS) is very sensitive to the refractive index (RI) of the sensing layer after increasing through the SPR. Furthermore, it is observed that the sign of the TS of the PSHE can be modulated according to I p within a specific angle of incidence. In light of these findings, we put forth a novel optical signal modulation and RI sensing scheme based on PSHE. Our study provides a new mechanism for practical applications of PSHE in optical communication and precision measurement. • Enhanced photonic spin Hall effect by AuAl 2 -based surface plasmon resonance. • By employing nonlinear modulation, this work achieves transverse shift inversion and coding. • A refractive index sensor with sensitivity 2. 599 × 10 6 μ m /RIU. [ABSTRACT FROM AUTHOR]