Interparticle Coupling Effects of Two Quantum Dots System on the Transport Properties of a Single Plasmon

TL;DR

This paper theoretically investigates how the coupling between two quantum dots affects the transport properties of a single plasmon in a surface plasmonic waveguide, revealing controllable switching and Fano resonance effects.

Contribution

It introduces a theoretical analysis of interparticle coupling effects on plasmon transport, highlighting control mechanisms for plasmon switching and resonance phenomena.

Findings

Switching of a single plasmon can be controlled by interparticle distance and coupling strengths.

Fano-type transmission spectrum arises from continuum-discrete excitation coupling.

Transport properties can be utilized in plasmonic nanodevices and quantum information applications.

Abstract

Transport properties of a single plasmon interacting with two quantum dots (QDs) system coupled to one-dimensional surface plasmonic waveguide are investigated theoretically via the real-space approach. We mainly focus on the coupling effects of the two QDs on the transmission properties of a single incident plasmon. We demonstrated that switching of a single plasmon can be achieved by controlling the interparticle distance, the interparticle coupling strength, and the QD-waveguide coupling strength, as well as spectral detuning. We also showed that the coupling between the continuum excitations and the discrete excitations results in the Fano-type transmission spectrum. The transport properties of a single plasmon interacting with such a two direct coupled QDs system could find the applications in the design of plasmonic nanodevices, such as single photon switching and nanomirrors, and in quantum information processing.