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18 April 2006Nanoscale optical spectroscopy and detection
We use a laser-irradiated metal tip to create a locally enhanced field at the tip apex. The tip acts as an optical antenna and is held a few nanometers above the sample surface so that a highly localized interaction between the enhanced field and the sample is achieved. The method has been successfully combined with vibrational spectroscopy by making use of the well-known effect of surface enhanced Raman scattering (SERS). We mapped out the vibrational modes of individual single-walled carbon nanotubes (SWNT) with a resolution down to l0nm.
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L. Novotny, N. Anderson, M. R. Beversluis, A. Hartschuh, "Nanoscale optical spectroscopy and detection," Proc. SPIE 6180, Photonics, Devices, and Systems III, 61802B (18 April 2006); https://doi.org/10.1117/12.675863