Quasi-Freeform Metasurfaces for Wide-Angle Beam Deflecting and Splitting.

ABSTRACT: Metasurfaces attracted extensive interests due to their outstanding ability to manipulate the wavefront at a subwavelength scale. In this study, we demonstrated quasi-freeform metasurfaces in which the radius, location, and height of the nanocylinder building blocks were set as optimized structure parameters, providing more degrees of freedom compared with traditional gradient metasurfaces. Given a desired wavefront shaping objective, these structure parameters can be collectively optimized utilizing a hybrid optimized algorithm. To demonstrate the versatility and feasibility of our method, we firstly proposed metasurfaces with deflecting efficiencies ranging from 86.2% to 94.8%, where the deflecting angles can vary in the range of 29°-75.6°. With further study, we applied our concept to r

SUBMITTER: Zhang Q 

PROVIDER: S-EPMC10097112 | biostudies-literature | 2023 Mar

REPOSITORIES: biostudies-literature