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Nano-Raman Spectroscopy: Surface Plasmon Emission, Field Gradients, and Fundamentally Near Field Propagation Effects

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NanoBiotechnology

Abstract

Nano-Raman spectra differ from far-field Raman spectra. The differences result from a strong electric field gradient near the metal tip, propagation, and polarization, but the dependence upon probe-sample distance can only be explained by the inclusion of surface plasmons and the near-field, non-propagating terms of the dipole emission. A simple model based upon these components accurately describes distance-dependent data measured with a near-field scanning optical microscope. Our essentially near-field model will apply generally to Raman spectroscopy near a nanoscale conductor.

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Acknowledgement

This material is based upon work supported by the National Science Foundation under Grant Nos. DMR-9975543 and DMII-0210058. We acknowledge technical discussions with Catherine Jahncke and Eric Ayars.

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  1. Department of Physics, North Carolina State University Raleigh, Raleigh, NC, 27695-8202, USA

    H. D. Hallen

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  1. H. D. Hallen
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Correspondence to H. D. Hallen.

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Hallen, H.D. Nano-Raman Spectroscopy: Surface Plasmon Emission, Field Gradients, and Fundamentally Near Field Propagation Effects. Nanobiotechnol 3, 197–202 (2007). https://doi.org/10.1007/s12030-008-9013-1

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  • DOI: https://doi.org/10.1007/s12030-008-9013-1

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