We address the challenge of realizing strong intrinsic chirality from thin, planar dielectric nanostructures. Most notably, we experimentally achieve near-unity circular dichroism with ~90% of the light with the chosen helicity being transmitted at a wavelength of 540 nm. This is the highest value demonstrated to date for any geometry in the visible spectrum. These experimental results enable the realization of high-performance miniaturized chiro-optical components in a scalable manner at optical frequencies.
This is published in Light: Science & Applications.