Spectral-Kinetic Properties of Plasmon Hybrid Nanocomposites Based on Copper Phthalocyanine and Silver

Abstract

Based on the use of femtosecond time-resolved pump–probe spectroscopy, it has been found that the presence of plasmonic silver nanoparticles in a hybrid thin-film Ag-CuPc nanocomposites leads to a significant reduction in the relaxation time of induced absorption from an excited singlet state of the copper phthalocyanine film in compared with the pure film. The observed effect is associated with the intersystem crossing acceleration in CuPc molecules located in a nonuniform field near the surface of plasmonic silver nanoparticles in the hybrid nanocomposite. The dependence of the detected effects on the thickness of copper phthalocyanine layers in hybrid (Ag-CuPc)ⁿAg nanocomposites is demonstrated.