Effects of dephasing and vibronic structure on the first hyperpolarizability of strong charge transfer molecules

Chin Hsien Wang

doi:10.1117/12.386377

19 May 2000 Effects of dephasing and vibronic structure on the first hyperpolarizability of strong charge transfer molecules

Chin Hsien Wang

Author Affiliations +

Proceedings Volume 3939, Organic Photonic Materials and Devices II; (2000) https://doi.org/10.1117/12.386377
Event: Symposium on Integrated Optoelectronics, 2000, San Jose, CA, United States

Abstract

The dispersion of the first molecular hyperpolarizability (beta) of strongly charge-transfer chromophores is investigated. In the two-photon resonance regime, both dephasing and vibronic and vibronic structure plays an important role in affecting the molecular hyperpolarizability. An equation for (beta) that includes the effect of dephasing and vibrational structure of electronic states is derived. It is shown that, if only the dephasing mechanism is included in the two level model, the intrinsic hyperpolarizability (beta) ₀ calculated from the hyper- Rayleigh scattering experimental data using the Oudar-Chemla equation, will decrease with decreasing the excitation wavelength. The trend is reversed when the vibrational structure is also incorporated.

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Chin Hsien Wang "Effects of dephasing and vibronic structure on the first hyperpolarizability of strong charge transfer molecules", Proc. SPIE 3939, Organic Photonic Materials and Devices II, (19 May 2000); https://doi.org/10.1117/12.386377

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