  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.
