Spectral inhomogeneities and spatially resolved dynamics in porphyrin J-aggregate studied in the near-field

Tetsuhiko Nagahara, Kohei Imura, Hiromi Okamoto

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33 Citations (Scopus)

Abstract

Mesoscopic properties of water-insoluble tetrakis(4-methoxyphenyl) porphyrin J-aggregate in thin film have been investigated by time-resolved scanning near-field optical microscopy. The film was found to be composed of planar microcrystallines with lengths of a few micrometers, widths of ∼100 nm, and ∼20 nm heights. The transmittance spectra are site-specific. This observation might reflect inhomogeneity of the sample, and is related to the broad J-bands compared to those of tetrakis(4-sulfonatophenyl)porphyrin. Excited-state lifetimes, obtained from pump-probe measurements in small domains, were ranging from 10 to 50 ps that are of the same order with the far-field results.

Original languageEnglish
Pages (from-to)368-375
Number of pages8
JournalChemical Physics Letters
Volume381
Issue number3-4
DOIs
Publication statusPublished - 2003 Nov 14
Externally publishedYes

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Atomic and Molecular Physics, and Optics

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