Plasmonic nano-slits assisted polarization selective detour phase meta-hologram

Traditional detour-phase hologram is a powerful optical device for manipulating phase and amplitude of light, but it is usually not sensitive to the polarization of light. By introducing the light-metasurface interaction mechanism to the traditional detour phase hologram, we design a novel plasmonic nano-slits assisted polarization selective detour phase meta-hologram, which has attractive advantages of polarization multiplexing ability, broadband response, and ultra-compact size. The meta-hologram relies on the dislocations of plasmonic slits to achieve arbitrary phase distributions, showing strong polarization selectivity to incident light due to the plasmonic response of deep-subwavelength slits. To verify its polarization sensitive and broadband responses, we experimentally demonstrate two holographic patterns of an optical vortex and an Airy beam at p- and s-polarized light with wavelengths of 532nm, 633nm and 780nm, respectively. Furthermore, we realize an application example of the meta-hologram as a polarization multiplexed photonic device for multi-channel optical angular momentum (OAM) generation and detection. Such meta-holograms could find widespread applications in photonics, such as chip-level beam shaping and high-capacity OAM communication.