Plasmonic enhancement of vibrational signals in the infrared

 

Metal nanostructures offer a large variety of applications in today's technologies, because their optical properties from coherent oscillations of free electrons (so called plasmons) can be tuned over a broad frequency range from the far infrared to the visible. Of special interest is the huge near-field enhancement at resonance, because it enables extraordinarily sensitive infrared detection of vibrational excitations. The vibrational absorption lines of molecules that are located in the near-field range of the nanostructures appear as Fano-type signals on the broad plasmonic spectrum. Compared to molecular absorption spectra, the signal size in this kind of surface enhanced infrared absorption (SEIRA) can be 105 - 106 times stronger due to the contribution of resonant plasmonic light scattering. This kind of SEIRA allows very sensitive detection of biomolecules, chemicals, and ultrafine dust.

 

Literature

  • F. Neubrech and A. Pucci. Surface-enhanced infrared spectroscopy. Spectrosc. Eur., 24(5):6-10, 2012. [Link]
  • F. Neubrech and A. Pucci. Plasmonic enhancement of vibrational excitations in the infrared. IEEE J. Sel. Top. Quantum Electron., PP(99):1, 2012. [Link]
  • J. Vogt, C. Huck, F. Neubrech and A. Pucci. Plasmonic light scattering and infrared vibrational signal enhancement, in Frontiers of Plasmon Enhanced Spectroscopy (ed. by Y. Ozaki), ACS Symposium Series, eBook 2016.

Contact

If you are interested in further information or in a collaboration please contact A. Pucci.

 
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