2 May 2014 Transient pump-probe absorption spectroscopy of semiconductor nanodumbbells
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Abstract
We develop a theory of time-resolved pump–probe optical spectroscopy for modelling interband absorption by an anisotropic semiconductor nanodumbbell. By considering three transition schemes where the pump and probe pulses are nearly resonant to a dipole-allowed interband transition of different elements of the nanodumbbell, and assuming that the populations of the exited states are coupled through the nonradiative relaxation processes, we analytically calculate the absorption efficiency of the probe as a function of its delay from the pump for relatively short pulses. The obtained functional dependency, being the sum of exponentials with exponents proportional to the energy relaxation rates of the excited electronic states, is useful for the analysis of experimental absorption spectra aiming at retrieving the relaxation parameters of the nanodumbbell’s electronic subsystem.
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Mikhail Yu. Leonov, Mikhail Yu. Leonov, Ivan D. Rukhlenko, Ivan D. Rukhlenko, Anvar S. Baimuratov, Anvar S. Baimuratov, Alexander V. Baranov, Alexander V. Baranov, Yurii K. Gun'ko, Yurii K. Gun'ko, Anatoly V. Fedorov, Anatoly V. Fedorov, } "Transient pump-probe absorption spectroscopy of semiconductor nanodumbbells", Proc. SPIE 9126, Nanophotonics V, 91262C (2 May 2014); doi: 10.1117/12.2051755; https://doi.org/10.1117/12.2051755
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