University of Connecticut

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Atomic, Molecular, and Optical Physics Seminar

Monday, December 18, 2017
4:00pm – 5:00pm

Storrs Campus
Physics Building, P121

Soroush Khosravi-Dehaghi, Department of Physics, University of Connecticut

Femtosecond nonlinear optical spectroscopy of carotenoids and single wall carbon nanotubes

Nonlinear optical spectroscopy can provide the most comprehensive picture of the optical response of any quantum system. The energy structure and excited state dynamics of the system can be revealed unambiguously, using such a comprehensive time- and frequency- resolved (both detection and excitation frequencies) optical response. My research has been focused on the measurement and interpretation of the optical responses of different samples using two of the most advanced ultrafast nonlinear optical spectroscopy techniques including Transient Absorption (TA) and Transient Grating (TG) spectroscopies. Transient absorption spectroscopy measures the time- and frequency- resolved (detection) amplitude of the optical response of the system after an initial excitation to a specific energy state. Heterodyne transient grating spectroscopy, which employs a more sophisticated light-matter interaction geometry, measures the phase of the optical response in addition to its time- and frequency- resolved (detection) amplitude. The latest results of the measurements on carotenoids and single wall carbon nanotubes (SWNTs) will be presented.

Contact:

Prof. C. Trallero

Physics Department (primary)

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