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Two-photon fluorescence imaging and spectroscopy of nanostructured organic materials using a photon scanning tunneling microscope

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6 Author(s)
Shen, Yuzhen ; Photonics Research Laboratory, Departments of Chemistry and Physics, State University of New York at Buffalo, Buffalo, New York 14260 ; Jakubczyk, Daniel ; Xu, Faming ; Swiatkiewicz, Jacek
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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.

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Applied Physics Letters  (Volume:76 ,  Issue: 1 )