Realizing Giant Spin-Selective Reflection based on a Chiral Meta-structure Operating in the Visible-Infrared Regime

Abstract: The spin-selective reflection to introduce chirality which can have a lot of applications in real life such as spectroscopy, optical setups, media industry etc. In this paper, a reflection based metasurface proposed to introduce the giant chiroptical effects at broadband visible and infrared (IR) regimes. The optimization and results of basic unit also termed as nanostructure are demonstrated here. The reflectance at the optimal parameters for the proposed nanostructure shows the inclusion of multiband giant chiroptical effects in reflection mode. The results show that this metasurface can elicit large spin-selective reflection coefficients with moderate chirality covering the broadband wavelength. The circular dichroism in the visible and IR regime shows its potential applicability for a lot of applications in our daily life. This work also provides a new approach to achieve giant Spin Hall Effect at broadband wavelength ranges with low loss.