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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 20, Iss. 2 — Feb. 1, 2003
  • pp: 321–332

Enhancement of two-photon absorption in tetrapyrrolic compounds

Aliaksandr Karotki, Mikhail Drobizhev, Mikalai Kruk, Charles Spangler, Erik Nickel, Nugzar Mamardashvili, and Aleksander Rebane  »View Author Affiliations


JOSA B, Vol. 20, Issue 2, pp. 321-332 (2003)
http://dx.doi.org/10.1364/JOSAB.20.000321


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Abstract

We study the enhancement of two-photon absorption (TPA) in a series of porphyrins and tetraazaporphyrins by measuring the absolute TPA cross sections with 100-fs-duration pulses in two ranges of laser wavelengths, from 1100 to 1500 and from 700 to 800 nm. The cross section in the Q transition region is σ2110 GM (where 1 GM=10-50 cm4 s-1 photons-1), a value that is explained by partial lifting of the prohibition that is due to a parity selection rule. In the Soret transition region we find σ2 enhancement by ∼1 order of magnitude owing to the Q transition, which acts as a near-resonance intermediate state, and also owing to the presence of gerade energy levels, which we identify in this spectral region. In tetraazaporphyrins symmetrically substituted with strong electron acceptors, we find further enhancement (up to σ21600 GM). As a possible application, we demonstrate for the first time to our knowledge the photosensitization of singlet-oxygen luminescence by TPA in porphyrin.

© 2003 Optical Society of America

OCIS Codes
(190.4180) Nonlinear optics : Multiphoton processes
(190.4710) Nonlinear optics : Optical nonlinearities in organic materials
(300.6410) Spectroscopy : Spectroscopy, multiphoton

Citation
Aliaksandr Karotki, Mikhail Drobizhev, Mikalai Kruk, Charles Spangler, Erik Nickel, Nugzar Mamardashvili, and Aleksander Rebane, "Enhancement of two-photon absorption in tetrapyrrolic compounds," J. Opt. Soc. Am. B 20, 321-332 (2003)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-20-2-321

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