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

Tetsuhiko Nagahara, Kohei Imura, Hiromi Okamoto

Research output: Contribution to journalArticle

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

Fingerprint

Near field scanning optical microscopy
Porphyrins
Excited states
porphyrins
near fields
inhomogeneity
Pumps
Thin films
Water
far fields
micrometers
transmittance
pumps
microscopy
life (durability)
scanning
probes
thin films
water
excitation

ASJC Scopus subject areas

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

Cite this

Spectral inhomogeneities and spatially resolved dynamics in porphyrin J-aggregate studied in the near-field. / Nagahara, Tetsuhiko; Imura, Kohei; Okamoto, Hiromi.

In: Chemical Physics Letters, Vol. 381, No. 3-4, 14.11.2003, p. 368-375.

Research output: Contribution to journalArticle

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