Tailoring optical response of a hybrid comprising a quantum dimer emitter strongly coupled to a metal nanoparticle

Abstract

We study theoretically the optical response of a nanohybrid comprising a symmetric quantum dimer emitter coupled to a metal nanoparticle (MNP). The interactions between the exitonic transitions in the dimer and the plasmons in the MNP lead to novel effects in the composite's input-output characteristics for the light intensity and the absorption spectrum, which we study in the linear and nonlinear regimes. We fnd that the exciton-plasmon hybridization leads to optical bistability and hysteresis for the one-exciton transition and enhancement of excitation for the two-exciton transition. The latter leads to a signifcant decrease of the field strength needed to saturate the system. In the linear regime, the absortion spectrum has a dispersive (Fano-like) line shape. The spectral position and shape of this spectrum depend on the detuning of the dimer's one-exciton resonance relative to the plasmon resonance. Upon increasing the applied field intensity to the nonlinear regime, the Fano-like singularities in the absorption spectra are smeared and they disappear due to the saturation of the dimer, which leads to the MNP dominating the spectrum. The above effects, for which we provide physical explanations, allow one to tailor the Fano-like shape of the absorption spectrum, by changing either the detuning or the input power.

References in corpus (5)

• Semiconductor-metal nanoparticle molecules: hybrid excitons and non-linear Fano effect
• Optical bistability and hysteresis of hybrid metal-semiconductor nano-dimer
• Coherent interaction of a metallic structure with a single quantum emitter: from super absorption to cloaking
• Strong coupling of optical nanoantennas and atomic systems
• Ultrafast Energy Transfer Between Molecular Assemblies and Surface Plasmons in the Strong Coupling Regime

Cited by in corpus (5)

• Plasmon-assisted two-photon Rabi oscillations in a semiconductor quantum dot -- metal nanoparticle heterodimer
• Plasmon-assisted two-photon absorption in a semiconductor quantum dot -- metallic nanoshell composite
• Coherent preparation of the biexciton state in a semiconductor quantum dot coupled to a metallic nanoparticle
• Instabilities in the optical response of a semiconductor quantum dot - metal nanoparticle heterodimer: self - oscillations and chaos
• Generation of maximally entangled states in hybrid two quantum dots mediated by a spherical metal nanoparticle driven by external laser field