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ICOP & ICPET 2015, 21 - : 1663-1666 Back to browse issues page
Evidence of Concentration dependence of the two-photon absorption cross section: Determining the “true” cross section value
Aliasghar Ajami Dr. *
Abstract:   (1703 Views)
The two-photon absorption (2PA) phenomenon is the basis of many unique applications involving suitable chromophores as photoinitiators. Ideally the 2PA cross section should, therefore, be a unique parameter, allowing quantification and comparing 2PA capabilities of different substances. In this report, the most straightforward and widespread method, the Z-scan technique, was used for determining the 2PA cross-section values of three different synthesized. It is demonstrated that the experimentally obtained values strongly depend on the molar concentration of a measured solution. A tenfold decrease in substance concentration can lead to the doubling of the 2PA cross-section. Among the crucial implications of this observed behavior is the questionable possibility to compare the 2PA characteristics of different compounds based on the values reported in the literature. An example of another important consequence of this effect extends i.e. to the calculation of the dose necessary for killing the tumor cells in 2PA-based photodynamic therapy applications. The possible factors responsible for this contra-intuitive behavior are discussed and investigated. Finally, a reliable measurement protocol for comprehensive characterization of 2PA capability of different substances is proposed. Herewith an attempt to establish a standard method, which takes into account the concentration dependence, is made.
Keywords: Nonlinear optics, Two-photon absorption, Two-photon initiator, Ultrashort laser pulses
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Type of Study: Research | Subject: Special
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ajami A. Evidence of Concentration dependence of the two-photon absorption cross section: Determining the “true” cross section value. ICOP & ICPET. 2015; 21 :1663-1666
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Volume 21 - Back to browse issues page
انجمن اپتیک و فوتونیک ایران Optics and Photonics Society of Iran
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