Cross-polarized surface lattice resonances in a rectangular lattice plasmonic metasurface

TL;DR

This paper demonstrates a rectangular lattice plasmonic metasurface with multiple high-Q surface lattice resonances, achieved by exploiting polarization, enabling advanced filtering, sensing, and nonlinear optical applications.

Contribution

The authors experimentally realize a rectangular lattice metasurface with multiple narrow high-Q resonances using polarization control, achieving record-high Q-factors in the near-infrared range.

Findings

Surface lattice resonances at 630 nm and 1160 nm with Q-factors of ~50 and ~800.

Record-high plasmonic Q-factor of ~800 in the near-infrared window.

Potential for enhanced frequency conversion and all-optical switching applications.

Abstract

Multiresonant metasurfaces could enable many applications in filtering, sensing and nonlinear optics. However, developing a metasurface with more than one high-quality-factor or high-Q resonance at designated resonant wavelengths is challenging. Here, we experimentally demonstrate a plasmonic metasurface exhibiting different, narrow surface lattice resonances by exploiting the polarization degree of freedom where different lattice modes propagate along different dimensions of the lattice. The surface consists of aluminum nanostructures in a rectangular periodic lattice. The resulting surface lattice resonances were measured around 630 nm and 1160 nm with Q-factors of ~50 and ~800, respectively. The latter is a record-high plasmonic Q-factor within the near-infrared type-II window. Such metasurfaces could benefit applications such as frequency conversion and all-optical switching.