

We characterized the longitudinal field formed at a tightly focused spot by a high numerical aperture objective lens using a tip-enhanced near-field microscope. The longitudinal field efficiently excites the localized surface plasmon polaritons at the metallic tip apex resulting in an electric field enhancement. Radially polarized light generated by a combination of four half-waveplates successfully increases the longitudinal field resulting in higher sensitivity for tip-enhanced Raman spectroscopy of adenine nanocrystals. © 2004 American Institute of Physics.
| Engineering controlled terms: | Charge coupled devicesElectric excitationElectric field effectsFluorescenceNanostructured materialsPolarizationSensitivity analysisSingle crystalsSpectrum analysis |
|---|---|
| Engineering uncontrolled terms: | Liquid nitrogenNanocrystalsNear-field microscopyTip-enhanced Raman spectroscopy |
| Engineering main heading: | Raman spectroscopy |
Hayazawa, N.; Nanophotonics Laboratory, RIKEN, Japan;
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