# Reaching the highest efficiency of spin Hall effect of light in the near-infrared using all-dielectric metasurfaces

## TL;DR

Researchers developed a metasurface that achieves a large and efficient spin Hall effect of light in the near-infrared range.

## Contribution

The work demonstrates a high-efficiency spin Hall effect of light in the optical regime using an all-dielectric metasurface.

## Key findings

- Spin Hall shifts of up to 10 wavelengths were achieved at 800 nm.
- Efficiencies over 70% were observed under two linear polarizations.
- The method extends previous microwave demonstrations to the optical regime.

## Abstract

The spin Hall effect of light refers to a spin-dependent transverse splitting of light at a planar interface. Previous demonstrations to enhance the splitting have suffered from exceedingly low efficiency. Achievements of the large splitting with high efficiency have been reported in the microwave, but those in the optical regime remain elusive. Here, an approach to attain the large splitting with high efficiency in the near-infrared is proposed and experimentally demonstrated at 800 nm by using a dielectric metasurface. Modulation of the complex transmission of the metasurface leads to the shifts that reach 10λ along with efficiencies over 70% under two linear polarizations. Our work extends the recent attempts to achieve the large and efficient spin Hall effect of light, which have been limited only to the microwave, to the optical regime.

Here, Junsuk Rho and co-workers propose and experimentally demonstrate a metasurface supporting a large and efficient spin Hall effect of light in optical wavelength. The spin Hall shifts reaching ten wavelengths with efficiencies over 70% are observed.