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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry M. Van Driel
  • Vol. 24, Iss. 1 — Jan. 1, 2007
  • pp: 67–76

Experimental and theoretical approaches to understanding two-photon absorption spectra in polymethine and squaraine molecules

Jie Fu, Lazaro A. Padilha, David J. Hagan, Eric W. Van Stryland, Olga V. Przhonska, Mikhail V. Bondar, Yuriy L. Slominsky, and Alexei D. Kachkovski  »View Author Affiliations


JOSA B, Vol. 24, Issue 1, pp. 67-76 (2007)
http://dx.doi.org/10.1364/JOSAB.24.000067


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Abstract

We performed a detailed experimental investigation and quantum-chemical analysis of two-photon absorption (2PA) spectra of a series of symmetrical cationic polymethines and neutral squaraines having similar structures. Degenerate 2PA spectra of these molecules are taken by using two-photon fluorescence spectroscopy and the Z-scan technique. All measurements are made with 150 fs laser pulses of 1 kHz repetition rate in the tuning range of 520 2100 nm ( 0.6 2.4 eV ) . Comparing 2PA spectra of polymethines and squaraines, we find that we can access considerably larger 2PA cross sections ( 8600 × 10 50 cm 4 s /photon) in the squaraines owing to narrower linear absorption spectra and an increase in the density of unoccupied molecular orbitals introduced by the squaraine acceptor group in the conjugated chain.

© 2006 Optical Society of America

OCIS Codes
(190.4180) Nonlinear optics : Multiphoton processes
(190.4710) Nonlinear optics : Optical nonlinearities in organic materials

ToC Category:
Nonlinear Optics

History
Original Manuscript: July 20, 2006
Manuscript Accepted: August 21, 2006

Virtual Issues
Vol. 2, Iss. 2 Virtual Journal for Biomedical Optics

Citation
Jie Fu, Lazaro A. Padilha, David J. Hagan, Eric W. Van Stryland, Olga V. Przhonska, Mikhail V. Bondar, Yuriy L. Slominsky, and Alexei D. Kachkovski, "Experimental and theoretical approaches to understanding two-photon absorption spectra in polymethine and squaraine molecules," J. Opt. Soc. Am. B 24, 67-76 (2007)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-24-1-67

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