Abstract
For a horizontally polarized Gaussian beam incident on surface plasmon resonance structure composed of prism, silver film, and absorptive liquid, the left- and right-handed circularly polarized components of the reflected beam undergo spin-dependent spatial and angular Imbert–Fedorov (IF) shift. We investigate spin Hall effect of light (SHEL) after the reflected beam travels a distance of Rayleigh range. It is shown that the maximum total transverse shift (TTS) of one spin component at Rayleigh range is always larger than the maximum spatial IF shift, and TTS is more sensitive to variations in the parameters of the structure than spatial IF shift. Furthermore, this SHEL is adjustable by changing the complex refractive index of the absorptive liquid. This research provides a simple way to enhance SHEL and may have potential application of improving the accuracy of sensors based on SHEL.
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