Fingerprint detection in the mid-infrared region based on guided-mode resonance and phonon-polariton coupling of analyte

Mid-infrared absorption spectroscopy is an effective method for detecting analyte fingerprints without labeling, but the inherent loss of metals in current methods is a main issue. Here, a sensing scheme was proposed that uses an all-dielectric grating metasurface and angular scanning of polarized light, and then it was verified by numerical simulation. The proposed fingerprint detection scheme could effectively couple a guided-mode resonance spectrum peak with the characteristic peak of the analyte's phonon-polariton in the mid-infrared region, significantly enhancing the interaction between light and the analyte. The novel scheme would realize broadband enhancement to detect a variety of substances, and facilitate mid-infrared sensing and analysis of trace substances. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Automated summary

The proposed sensing scheme utilizes an all-dielectric grating metasurface and angular scanning of polarized light to enhance the interaction between light and analytes, enabling broadband enhancement for detecting various substances and facilitating sensing and analysis of trace substances in the mid-infrared region.