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Photon scanning tunneling microscopy and spectroscopy using femtosecond two-photon excitation are demonstrated. The measurement of both intensity dependence and spectral dependence is performed on a two-photon chromophore. A subdiffraction-limited resolution is obtained, and the domain-size dependence of spatial and spectral features is observed, which indicates the high degree of molecular order in the isolated nanoparticle. It is shown that the light confinement due to a quadratic dependence of the fluorescence intensity leads to an optical contrast enhancement with a coated probe. © 2000 American Institute of Physics.
Published in:
Applied Physics Letters
(Volume:76
,
Issue:
1
)
Date of Publication: Jan 2000
- Page(s):
- 1 - 3
- ISSN :
- 0003-6951
- Digital Object Identifier :
- 10.1063/1.125637
- Product Type:
- Journals & Magazines
- Date of Current Version :
- 18 June 2009
- Issue Date :
- Jan 2000
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