Gurus of Raman Spectroscopy
A group from the École polytechnique fédérale de Lausanne in Switzerland has proposed a potentially disruptive new model – dynamical backaction amplification (DBA) of molecular vibrations – to explain unexpected observations in surface-enhanced Raman spectroscopy (SERS). And they believe the work will open up opportunities for novel systems that further enhance the detection capability of SERS. However, the model has not been fully accepted by the spectroscopy community, with other researchers heading in different directions. Volker Deckert (University of Jena and Leibniz Institute of Photonic Technology, Germany) and Duncan Graham (University of Strathclyde and Renishaw Diagnostics, UK) offer their own thoughts on the future of Raman spectroscopy.
Volker Deckert, Duncan Graham |
The DBA Lowdown
The set of vibrational frequencies of a molecule constitutes its unique fingerprint. Vibrational modes that are “Raman-active” interact with incident laser light in an inelastic scattering process. This results in secondary photons with a frequency shifted from the incident ones by the vibrational frequency. Raman spectroscopy leverages this process to optically measure the vibrational spectrum of a molecule (or a material) and thus reveal its chemical identity.
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