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Optics Letters

Optics Letters


  • Editor: Anthony J. Campillo
  • Vol. 32, Iss. 21 — Nov. 1, 2007
  • pp: 3083–3085

Strong coupling in macrocyclic thiophene investigated by time-resolved two-photon excited fluorescence

Oleg Varnavski, Peter Bäuerle, and Theodore Goodson, III  »View Author Affiliations

Optics Letters, Vol. 32, Issue 21, pp. 3083-3085 (2007)

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We report the femtosecond dynamics of fluorescence anisotropy excited through the two-photon absorption (TPA), which provides direct signatures of delocalized electronic excitations for symmetrical macromolecular architectures. Two-photon excited fluorescence anisotropy is strongly correlated with the orientation and value of the transition moment from the excited state to the second and higher lying states. For macromolecular systems it leads to a relatively low initial fluorescence anisotropy and specific femtosecond anisotropy dynamics. We have experimentally demonstrated qualitatively different anisotropy dynamics for two- and one-photon absorption excitations for strongly coupled ring architecture prospective for artificial-light-harvesting applications and possessing an enhanced TPA-absorption cross section.

© 2007 Optical Society of America

OCIS Codes
(020.4180) Atomic and molecular physics : Multiphoton processes
(190.4180) Nonlinear optics : Multiphoton processes
(190.4710) Nonlinear optics : Optical nonlinearities in organic materials
(300.6530) Spectroscopy : Spectroscopy, ultrafast

ToC Category:
Ultrafast Spectroscopy

Original Manuscript: May 31, 2007
Revised Manuscript: August 17, 2007
Manuscript Accepted: August 23, 2007
Published: October 18, 2007

Oleg Varnavski, Peter Bäuerle, and Theodore Goodson III, "Strong coupling in macrocyclic thiophene investigated by time-resolved two-photon excited fluorescence," Opt. Lett. 32, 3083-3085 (2007)

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