Broadband Chiro-Optical Effects for Futuristic Meta-Holographic Displays

Futuristic holographic displays will essentially require broadband chiro-optical effects for medical imaging, virtual reality, smart security, and optical encryption. However, conventional metasurfaces cannot provide such on-chip realization of broadband chiro-optical effects. Moreover, the simultaneous conversion of amplitude, polarization, and phase (APP) at optical wavelengths to introduce giant chirality has not been realized yet. In this paper, a planar all-dielectric metasurface is proposed incorporating extra degrees of freedom to comprehend the conversion of APP with broadband chiro-optical effects in terms of giant asymmetric transmission with maximum efficiency of ≈77% at the wavelength of 567 nm. The underlying mechanism behind induced chiro-optical effects is also investigated using higher-order multipolar dielectric resonances. Moreover, experimental validation is performed using the reproduced polarization-encrypted meta-holograms at broadband visible wavelengths. This work expands the scope of meta-nanophotonics with potential applications in bioimaging and polarization-encrypted displays for healthcare and smart security applications.