Color Routing via Cross-Polarized Detuned Plasmonic Nanoantennas in Large Area Metasurfaces

TL;DR

This paper presents a novel large-area metasurface design using self-organized cross-polarized plasmonic nanoantennas for efficient broadband color routing, avoiding complex geometries and enabling practical flat-optics applications.

Contribution

It introduces a self-organized fabrication method for large-area plasmonic nanoantennas that achieve broadband color routing with high directivity, simplifying design complexity.

Findings

Broadband color routing with high directivity achieved.

Self-organized fabrication enables large-area metasurfaces.

Performance comparable to lithographic nanoantennas.

Abstract

Bidirectional nanoantennas are of key relevance for advanced functionalities to be implemented at the nanoscale, and in particular for color routing in an ultracompact flat-optics configuration. Here we demonstrate a novel approach avoiding complex collective geometries and/or restrictive morphological parameters, based on cross-polarized detuned plasmonic nanoantennas in a uniaxial (quasi-1D) bimetallic configuration. The nanofabrication of such a flat-optics system is controlled over a large-area (cm^2) by a novel self-organized technique exploiting ion-induced nanoscale wrinkling instability on glass templates to engineer tilted bimetallic nanostrip dimers. These nanoantennas feature broadband color routing with superior light scattering directivity figures, which are well described by numerical simulations and turn out to be competitive with the response of lithographic nanoantennas. These results demonstrate that our large-area self-organized metasurfaces can be implemented in real world applications of flat optics color routing from telecom photonics to optical nanosensing.