Three-Photon Direct Laser Writing of the QD-Polymer Metasurface for Large Field-of-View Optical Holography

Conventional metasurface holography based on special structural designs is extremely sensitive to the angle of the incident light. Without complex angle optimization for metasurface units, even a small increase in the angle may lead to a rapid decrease in the diffraction efficiency and loss of imaging information. Moreover, the response spectral range of most metasurface holographies cannot be freely adjusted from ultraviolet to infrared. In this study, we prepare a quantum dot (QD)-polymer material system and introduce 1035 nm three-photon direct laser writing (DLW) technology to fabricate the QD-polymer metasurface for large field-of-view optical holography. Based on the stable light absorption characteristics and insensitivity to the angle of incident light of QDs, we achieve a binary amplitude-only holography with a large field of view of ±70°. Moreover, based on the quantum confinement effect of the QDs, the tunable broadband characteristic of the QD-polymer metasurface holography from the ultraviolet to near-infrared is demonstrated, and the binary amplitude-only holography also shows polarization independence. In addition, based on the QD-polymer material system, we can realize a Pancharatnam-Berry phase holography. DLW-processed QD-polymer metasurfaces have the potential to maintain a long-term stability. This study provides a material system and a versatile and flexible technology for realizing various nanoparticle-polymer metasurface holography with a large field of view and tunable broadband characteristics.