High-Q Fano resonance in all-dielectric metasurfaces for molecular fingerprint detection

TL;DR

This paper introduces a high-Q all-dielectric metasurface with tunable Fano resonance for enhanced molecular fingerprint detection, enabling high-precision, label-free identification without a spectrometer.

Contribution

The work presents a novel high-Q meta-atom design with tunable Fano resonance for improved molecular sensing applications.

Findings

Meta-atom exhibits a sharp Fano resonance with Q factor around 2000.

Resonance frequency can be tuned across 1350-1750 1/cm by scaling.

Design allows for higher metapixel density without resonance overlap.

Abstract

We present and numerically investigate a high-quality factor (high-Q) meta-atom with Fano resonance. Numerical simulations indicate that the designed meta-atom has a single sharp Fano resonance in the 1350-1750 1/cm range. Moreover, the frequency of the single resonance can be tuned in this frequency range by scaling the meta-atom. We exploit these properties to design a pixelated metasurface for spectrometer-less molecular fingerprint retrieval. The proposed meta-atom with an average quality factor of 2000 makes it possible to decrease the scaling step of metapixels without introducing any resonance overlap between the metapixels leading to higher precision in label-free and non-destructive identification of the molecular fingerprints.