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J‐aggregation visualized with two‐photon‐resonant third‐harmonic generation
Author(s) -
Akimov D. A.,
Ivanov A. A.,
Alfimov M. V.,
Grabchak E. P.,
Shtykova A. A.,
Petrov A. N.,
Podshivalov A. A.,
Zheltikov A. M.
Publication year - 2003
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1086
Subject(s) - raman scattering , excited state , raman spectroscopy , resonance (particle physics) , photoluminescence , photon , absorption (acoustics) , two photon excitation microscopy , chemistry , two photon absorption , atomic physics , optoelectronics , physics , optics , laser , fluorescence
Third‐harmonic generation (THG) with a two‐photon‐absorption (TPA) type resonance was used to monitor the J‐aggregation of ethyl thiacarbocyanine in aqueous solution. Correlations between TPA‐resonant THG and two‐photon‐excited photoluminescence are revealed, indicating the significance of excited states for non‐linear‐optical processes in J‐aggregating solutions. Similar to Raman resonances in coherent anti‐Stokes Raman scattering, TPA resonances in THG allow THG enhancement to be effectively decoupled from the growth of radiation losses. Copyright © 2003 John Wiley & Sons, Ltd.