Mechanisms of enhanced two-photon absorption in porphyrins

Mikhail A. Drobizhev; Aliaksandr Karotki; Mikalai Kruk; Aleksander Rebane; Eric Nickel; Charles W. Spangler; Nugzar Mamardashvili

doi:10.1117/12.453258

14 February 2003 Mechanisms of enhanced two-photon absorption in porphyrins

Mikhail A. Drobizhev, Aliaksandr Karotki, Mikalai Kruk, Aleksander Rebane, Eric Nickel, Charles W. Spangler, Nugzar Mamardashvili

Author Affiliations +

Proceedings Volume 4797, Multiphoton Absorption and Nonlinear Transmission Processes: Materials, Theory, and Applications; (2003) https://doi.org/10.1117/12.453258
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

Abstract

We study absolute cross section of simultaneous two-photon absorption (TPA) in a series of porphyrins and tetraazaporphyrins by 100-fs-duration pulses in two ranges of laser wavelength, from 1100 to 1500 nm and from 700 to 800 nm. The cross section in Q transition region is, sigma(2) ~ 1-10 GM, and is explained by partial lifting of the parity prohibition rule. In Soret transition region we find enhancement by about an order of magnitude due to Q transition, which acts as a near-resonance intermediate state, and also due to gerade energy levels, which we identify in this spectral region. Further enhancement (up to sigma(2) ~ 1600 GM) is achieved by symmetrical substitution in tetraazaporphyrins with strong electron acceptor groups.

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Mikhail A. Drobizhev, Aliaksandr Karotki, Mikalai Kruk, Aleksander Rebane, Eric Nickel, Charles W. Spangler, and Nugzar Mamardashvili "Mechanisms of enhanced two-photon absorption in porphyrins", Proc. SPIE 4797, Multiphoton Absorption and Nonlinear Transmission Processes: Materials, Theory, and Applications, (14 February 2003); https://doi.org/10.1117/12.453258

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