Correlated signals of cluster superfluorescence under two-and three-photon excitation of CdSe/CdS nanostructures

Abstract

The possibility and conditions for generation of the correlated signals of cluster superfluorescence (CSF) under two and three-quantum excitation of nanostructured samples CdSe/CdS by two crossed at the angle of 60° femtosecond beams of the Ti:Sapphire laser radiation are investigated. It is shown that intensity of the CSF signals is proportional to the cube of the number of clusters and that these collective signals are generated in mutually opposite directions k1 – k2 and k2 – k1, where k1, k2 are the wavevectors of the exciting pulses.