Optical emulation of double-continuum Fano interference by circularly dichroic plasmonic metasurfaces

TL;DR

This paper demonstrates the classical emulation of double-continuum Fano interference using specially engineered plasmonic metasurfaces, revealing polarization-dependent effects and enabling targeted optical field concentration.

Contribution

It introduces an experimental realization of quantum-like Fano interference in plasmonic metasurfaces and develops an analytic theory to explain polarization-dependent suppression effects.

Findings

Successful experimental emulation of DCF interference in metasurfaces

Discovery of polarization-dependent suppression of Fano interference

Prediction of circularly dichroic optical field concentration

Abstract

Classical emulation of a ubiquitous quantum mechanical phenomenon of double-continuum Fano (DCF) interference using metasurfaces is experimentally realized by engineering the near-field interaction between two bright and one dark plasmonic modes. The competition between the bright modes, with one of them effectively suppressing the Fano interference for the orthogonal light polarization, is discovered and explained by the analytic theory of the plasmonic DCF interference, which is further applied to predicting the circularly dichroic optical field concentration by plasmonic metasurfaces.