Issue 43, 2022

Metasurface-enhanced mid-infrared spectroscopy in the liquid phase


Vibrational spectroscopy is an important tool in chemical and biological analysis. A key issue when applying vibrational spectroscopy to dilute liquid samples is the inherently low sensitivity caused by short interaction lengths and small extinction coefficients, combined with low target molecule concentrations. Here, we introduce a novel type of surface-enhanced infrared absorption spectroscopy based on the resonance of a dielectric metasurface. We demonstrate that the method is suitable for probing vibrational bands of dilute analytes with a range of spectral linewidths. We observe that the absorption signal is enhanced by 1–2 orders of magnitude and show that this enhancement leads to a lower limit of detection compared to attenuated total reflection (ATR). Overall, the technique provides an important addition to the spectroscopist's toolkit especially for probing dilute samples.

Graphical abstract: Metasurface-enhanced mid-infrared spectroscopy in the liquid phase

Supplementary files

Article information

Article type
Edge Article
13 Jul 2022
20 Oct 2022
First published
21 Oct 2022
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY license

Chem. Sci., 2022,13, 12858-12864

Metasurface-enhanced mid-infrared spectroscopy in the liquid phase

S. Kharratian, D. Conteduca, B. Procacci, D. J. Shaw, N. T. Hunt and T. F. Krauss, Chem. Sci., 2022, 13, 12858 DOI: 10.1039/D2SC03927C

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