Resonant Metalenses for Breaking the Diffraction Barrier

TL;DR

This paper presents resonant metalenses composed of coupled subwavelength resonators that enable imaging and focusing beyond the diffraction limit by converting subwavelength information into far-field signals.

Contribution

It introduces the concept of resonant metalenses and demonstrates their ability to achieve super-resolution imaging through experimental validation.

Findings

Achieved imaging resolution far below the diffraction limit.

Demonstrated far-field focusing with super-resolution.

Validated the concept using microwave experiments.

Abstract

We introduce the resonant metalens, a cluster of coupled subwavelength resonators. Dispersion allows the conversion of subwavelength wavefields into temporal signatures while the Purcell effect permits an efficient radiation of this information in the far-field. The study of an array of resonant wires using microwaves provides a physical understanding of the underlying mechanism. We experimentally demonstrate imaging and focusing from the far-field with resolutions far below the diffraction limit. This concept is realizable at any frequency where subwavelength resonators can be designed.