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    Photo-acoustic dual-frequency comb spectroscopy

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    Author
    Wildi, Thibault; Voumard, Thibault; Brasch, Victor; Yilmaz, Gürkan; Herr, Tobias
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    Abstract
    Photo-acoustic spectroscopy (PAS) is one of the most sensitive non-destructive analysis techniques for gases, fluids and solids. It can operate background-free at any wavelength and is applicable to microscopic and even non-transparent samples. Extension of PAS to broadband wavelength coverage is a powerful tool, though challenging to implement without sacrifice of wavelength resolution and acquisition speed. Here we show that dual-frequency comb spectroscopy (DCS) and its potential for unmatched precision, speed and wavelength coverage can be combined with the advantages of photo-acoustic detection. Acoustic wave interferograms are generated in the sample by dual-comb absorption and detected by a microphone. As an example, weak gas absorption features are precisely and rapidly sampled; long-term coherent averaging further increases the sensitivity. This novel approach of dual-frequency comb photo-acoustic spectroscopy (DCPAS) generates unprecedented opportunities for rapid and sensitive multi-species molecular analysis across all wavelengths of light.
    Publication Reference
    Nature Communications, vol. 11 (1), pp. 4164
    Year
    2020-08-20
    URI
    https://yoda.csem.ch/handle/20.500.12839/979
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