Transient intraband absorption of light by semiconductor nanorods

摘要

A unified approach based on the reduced-density-matrix formalism has been used to develop a theory of intraband energy absorption of probe pulses, induced by pump pulses in semiconductor nanorods in the shape of parallelipipeds or cylinders. The conditions are determined under which the dependence of the absorbed energy of the probe pulses on the delay time with respect to the pump pulses when intraband transitions occur is described by one or two exponential functions with exponents proportional to the energy-relaxation rates of the states of the electronic subsystem of the nanorods. It is shown that the transient spectroscopy of intraband absorption makes it possible to determine the relaxation rates of the energy of the electron states of the nanorods.