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Experimental verification of field-enhanced molecular vibrational scattering at single infrared antennas

Author

Listed:
  • Divya Virmani

    (CIC nanoGUNE BRTA)

  • Carlos Maciel-Escudero

    (CIC nanoGUNE BRTA
    CSIC-UPV/EHU)

  • Rainer Hillenbrand

    (CIC nanoGUNE BRTA
    Basque Foundation for Science
    UPV/EHU)

  • Martin Schnell

    (CIC nanoGUNE BRTA
    Basque Foundation for Science)

Abstract

Surface-enhanced infrared absorption (SEIRA) spectroscopy exploits the field enhancement near nanophotonic structures for highly sensitive characterization of (bio)molecules. The vibrational signature observed in SEIRA spectra is typically interpreted as field-enhanced molecular absorption. Here, we study molecular vibrations in the near field of single antennas and show that the vibrational signature can be equally well explained by field-enhanced molecular scattering. Although the infrared scattering cross section of molecules is negligible compared to their absorption cross section, the interference between the molecular-scattered field and the incident field enhances the spectral signature caused by molecular vibrational scattering by 10 orders of magnitude, thus becoming as large as that of field-enhanced molecular absorption. We provide experimental evidence that field-enhanced molecular scattering can be measured, scales in intensity with the fourth power of the local field enhancement and fully explains the vibrational signature in SEIRA spectra in both magnitude and line shape. Our work may open new paths for developing highly sensitive SEIRA sensors that exploit the presented scattering concept.

Suggested Citation

  • Divya Virmani & Carlos Maciel-Escudero & Rainer Hillenbrand & Martin Schnell, 2024. "Experimental verification of field-enhanced molecular vibrational scattering at single infrared antennas," Nature Communications, Nature, vol. 15(1), pages 1-12, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-50869-x
    DOI: 10.1038/s41467-024-50869-x
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    References listed on IDEAS

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    1. Iban Amenabar & Simon Poly & Monika Goikoetxea & Wiwat Nuansing & Peter Lasch & Rainer Hillenbrand, 2017. "Hyperspectral infrared nanoimaging of organic samples based on Fourier transform infrared nanospectroscopy," Nature Communications, Nature, vol. 8(1), pages 1-10, April.
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