Fourier-Engineered Plasmonic Lattice Resonances

TL;DR

This paper introduces Fourier lattice resonances (FLRs), a novel design approach for metasurfaces that enables precise placement of multiple high-Q resonances with minimal computational effort, advancing optical device customization.

Contribution

The authors present a Fourier-based design method for metasurfaces that allows arbitrary placement of multiple high-Q resonances using a single Fourier transform, simplifying fabrication.

Findings

Demonstrated metasurfaces with resonances at 1310 and 1550 nm

Achieved Q-factors as high as 800

Design process based on standard lithography and a single Fourier transform

Abstract

Resonances in optical systems are useful for many applications, such as frequency comb generation, optical filtering, and biosensing. However, many of these applications are difficult to implement in optical metasurfaces because traditional approaches for designing multi-resonant nanostructures require significant computational and fabrication efforts. To address this challenge, we introduce the concept of Fourier lattice resonances (FLRs) in which multiple desired resonances can be chosen a priori and used to dictate the metasurface design. Because each resonance is supported by a distinct surface lattice mode, each can have a high quality factor. Here, we experimentally demonstrate several metasurfaces with arbitrarily placed resonances (e.g., at 1310 and 1550 nm) and Q-factors as high as 800 in a plasmonic platform. This flexible procedure requires only the computation of a single Fourier transform for its design, and is based on standard lithographic fabrication methods, allowing one to design and fabricate a metasurface to fit any specific, optical-cavity-based application. This work represents an important milestone towards the complete control over the transmission spectrum of a metasurface.