Abstract
We present a way to observe Spin Hall effect in subwavelength gratings. A spinning evanescent wave can be asymmetrically transformed into propagation waves through one certain diffraction order by a periodical subwavelength grating. By detecting diffraction field distribution behind the grating, we observed spin-dependent diffraction patterns. Furthermore, replacing the periodical grating by a Fibonacci grating, we can simultaneously observe multiple order diffractions of a spin evanescent wave. In this case, the multiple diffraction beams can interfere to each other behind the quasi-periodical grating to from an asymmetric interference patterns. Our work provides another way towards the realization of Spin Hall effect of evanescent waves.
Published Version
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