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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 13, Iss. 26 — Dec. 26, 2005
  • pp: 10873–10881

Single-photon pumping and two-photon probing spectroscopy for the determination of absorption cross-sections in an organic semiconductor

Xinping Zhang, Yajun Xia, and Richard H. Friend  »View Author Affiliations


Optics Express, Vol. 13, Issue 26, pp. 10873-10881 (2005)
http://dx.doi.org/10.1364/OPEX.13.010873


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Abstract

We investigate the bleaching of two-photon absorption by single-photon excitation using femtosecond transient absorption measurements on the prototypical polyfluorene (F8), and thus introduce single-photon pumping and two-photon probing spectroscopy for the determination of absorption cross-sections in an organic semiconductor. Single-photon excitation at 3.1 eV rearranges the population distributions on the singlet excited state (1Bu ) and on the ground state (1Ag ), and probe pulses at 1.55 eV will thus be absorbed both by the singlet excited state through a single-photon process and by the partially depopulated ground state for two-photon transition from 1Ag to mAg . As a result, the two-photon absorption will be partially bleached, introducing a modulation to the total transient absorption. Probe intensity dependence of the transient absorption enables simultaneous determination of the two-photon absorption (mAg1Ag ) and exciton absorption (kAg1Bu ) cross-sections at 1.55 eV.

© 2005 Optical Society of America

OCIS Codes
(190.4180) Nonlinear optics : Multiphoton processes
(300.6500) Spectroscopy : Spectroscopy, time-resolved
(320.7150) Ultrafast optics : Ultrafast spectroscopy

ToC Category:
Research Papers

Citation
Xinping Zhang, Yajun Xia, and Richard H. Friend, "Single-photon pumping and two-photon probing spectroscopy for the determination of absorption cross-sections in an organic semiconductor," Opt. Express 13, 10873-10881 (2005)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-13-26-10873


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