Over-coupled resonator for broadband surface enhanced infrared absorption (SEIRA)

Laura Paggi, Alice Fabas, Hasnaa El Ouazzani, Jean-Paul Hugonin, Nikos Fayard, Nathalie Bardou, Christophe Dupuis, Jean-Jacques Greffet and Patrick Bouchon ()
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Laura Paggi: Université Paris-Saclay
Alice Fabas: Université Paris-Saclay
Hasnaa El Ouazzani: Université Paris-Saclay
Jean-Paul Hugonin: Université Paris-Saclay
Nikos Fayard: Université Paris-Saclay
Nathalie Bardou: Université Paris-Saclay
Christophe Dupuis: Université Paris-Saclay
Jean-Jacques Greffet: Université Paris-Saclay
Patrick Bouchon: Université Paris-Saclay

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract Detection of molecules is a key issue for many applications. Surface enhanced infrared absorption (SEIRA) uses arrays of resonant nanoantennas with good quality factors which can be used to locally enhance the illumination of molecules. The technique has proved to be an effective tool to detect small amount of material. However, nanoresonators can detect molecules on a narrow bandwidth so that a set of resonators is necessary to identify a molecule fingerprint. Here, we introduce an alternative paradigm and use low quality factor resonators with large radiative losses (over-coupled resonators). The bandwidth enables to detect all absorption lines between 5 and 10 μm, reproducing the molecular absorption spectrum. Counterintuitively, despite a lower quality factor, the system sensitivity is improved and we report a reflectivity variation as large as one percent per nanometer of molecular layer of PMMA. This paves the way to specific identification of molecules. We illustrate the potential of the technique with the detection of the explosive precursor 2,4-dinitrotoluene (DNT). There is a fair agreement with electromagnetic simulations and we also introduce an analytic model of the SEIRA signal obtained in the over-coupling regime.

Date: 2023
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DOI: 10.1038/s41467-023-40511-7

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