Mechanism of near-field Raman enhancement in one-dimensional systems.
We develop a theory of near-field Raman enhancement in one-dimensional systems, and report supporting experimental results for carbon nanotubes. The enhancement is established by a laser-irradiated nanoplasmonic structure acting as an optical antenna. The near-field Raman intensity is inversely proportional to the 10th power of the separation between the enhancing structure and the one-dimensional system. Experimental data obtained from single-wall carbon nanotubes indicate that the Raman enhancement process is not significantly influenced by the specific phonon eigenvector, and is mainly defined by the properties of the nanoplasmonic structure.
Cançado
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LG
The Institute of Optics, University of Rochester, Rochester, New York 14627, USA.
Jorio
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A
Ismach
A
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Joselevich
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E
Hartschuh
A
A
Novotny
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L