Abstract
In this paper, by considering the surface plasmon resonance (SPR) effect, we theoretically study the photonic spin Hall effect (SHE) in a three-layer structure composed of glass, metal, and air. It is revealed that the obtained spin-dependent splitting in photonic SHE is far greater than the previously reported results in refraction when the incident angle is near the resonant angle. The inherent physics behind this interesting phenomenon is attributed to the sharp decrease in Fresnel reflective coefficients around the SPR. We also find that there exists an optimal thickness for minimal resonant reflection, above which the huge beam displacement is also observed. These findings provide us a pathway for modulating the photonic SHE and open the possibility of developing nanophotonic applications such as the SPR-based sensor.
Highlights
The photonic spin Hall effect (SHE) is an interesting transport phenomenon in which an applied field on the spin photons leads to the spin-dependent splitting of light beam perpendicular to the field [1]–[3]
We find that there exists an optimal thickness for minimal resonant reflection
We have investigated the surface plasmon resonance (SPR) induced photonic spin Hall effect (SHE) in a three-layer model made of glass, metal, and air
Summary
The photonic spin Hall effect (SHE) is an interesting transport phenomenon in which an applied field on the spin photons leads to the spin-dependent splitting of light beam perpendicular to the field [1]–[3]. Yin et al reported a strong photonic SHE resulting in the direct observation of large transverse motion of circularly polarized beam, even at normal incidence [14]. When the SPR is excited by a horizontal (H) polarization beam, we discover a huge transverse beam displacement which is far greater than the previous reported results observed at the air-glass interface. We find that there exists an optimal thickness for minimal resonant reflection above which the huge beam shift is observed These findings provide us a pathway for enhancing the photonic SHE and open the possibility of developing new nanophotonic applications.
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