Plasmon‐exciton coupling in neighboring metal nanoparticles and a semiconductor quantum well: Theory

Spectroscopic effects of plasmon‐exciton coupling are studied theoretically for metal nanoparticles and a semiconductor quantum-well located nearby. Resonant polarizability is self-consistently calculated for dipole plasmons supported by nanoparticles and influenced by image dipoles due to exciton polarization of the quantum well. Spectra of elastic scattering and reflection of light are analyzed in conformity with high-quality plasmons of silver nanoparticles and quasi-two-dimensional excitons of AlGaAs/GaAs quantum well. Essential two-peak resonant structure associated with plasmon‐exciton Rabi splitting is found. The related spectral dip is interpreted in terms of excitonic response enhancement by plasmons of nanoparticles.