Decay Rate and Resonance Fluorescence Spectrum of a Molecule Near a CompositeMaterial Surface

摘要

Optical properties, both linear and nonlinear, of composite materials with smallsolid particles distributed randomly in an otherwise homogeneous medium have been the subject of extensive research in recent years. The primary aim of this research is to study how the volume fraction of small particles affect the frequency dependence of optical properties of the adsorbed molecule, in particular, its spontaneous decay rate and light scattering spectrum. The spontaneous decay rate and resonance fluorescence spectrum of a molecule near the surface of composite materials are calculated in the effective medium approximation. Two substrates are considered: One is a semiconductor containing randomly distributed small dielectric particles and the other a dielectric with metallic particles. Results are analyzed in terms of energy transfer from the molecule to the substrate as functions of the volume fraction of impurity particles. Keywords: Decay rate; Resonance fluorescence; Molecule near surface; Composite substrates; Semiconductor/dielectric particles; Dielectric/metallic particles. (EDC)