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Retroreflectors that can accurately redirect the incident wave in free spaceback along its original channel provide unprecedented opportunities for lightmanipulation in wireless communication. However, to the best of our knowledge,the existing methods of designing retroreflectors suffer from either the bulkysize, narrow angular bandwidth, or time-consuming post-processing. Here, ascheme of designing ultrathin and all-angle retroreflectors based on hyperbolicplasmonic metasurfaces is proposed and experimentally demonstrated. Thephysical mechanism underlying this scheme is the high-efficiency all-angletransition between the traveling waves in free space and the canalized spoofsurface plasmon (SSP) on the hyperbolic plasmonic metasurfaces (HPMs). In thiscase, the strong confinement characteristic benefited from the enhancedlight-matter interaction enables us to route and retroreflect the canalized SSPwith extremely ultrathin structures. As proof of the scheme, a retroreflectorprototype with a thickness approximately equal to the central wavelength isdesigned and fabricated. Further experimental investigation obtains a maximumefficiency of 83.2% and a half-power field of view up to 53{\deg}. This schemecan find promising applications in target detection, remote sensing, anddiverse on-chip light control devices.

Ultrathin All-Angle Hyperbolic Metasurface Retroreflectors Based on Directed Routing of Canalized Plasmonics