Simulation of the gap plasmon coupling with a quantum dot

C. Perera; K. C. Vernon

doi:10.1117/12.2033300

7 December 2013 Simulation of the gap plasmon coupling with a quantum dot

C. Perera, K. C. Vernon

Proceedings Volume 8923, Micro/Nano Materials, Devices, and Systems; 89230Z (2013) https://doi.org/10.1117/12.2033300
Event: SPIE Micro+Nano Materials, Devices, and Applications, 2013, Melbourne, Victoria, Australia

Abstract

Active control of plasmon propagation via coupling to Quantum Dots (QDs) is a hot topic in nano-photonic research. When a QD is excited it acts like a dipole emitter. If this excited QD is placed near a metallic waveguide structure, it can decay either radiatively into bulk electromagnetic radiation, non-radiatively into heating of the metal or, of interest to this project, into a plasmon mode (γ_pl). By altering the position of the QD it is possible to optimise the decay into the plasmon mode.

In this paper we present a system with a QD placed within the vicinity of a single mode Gap Plasmon Waveguide (GPW). First, we constructed a 2D finite element modelling simulation to find γ_pl using COMSOL MULTIPHYSICS for symmetric GPW structures with varying width (w) of the gap and distance of the QD to the waveguide surface (d). We then constructed a 3D model to calculate total rate of spontaneous emission of a QD (γ_tot) and determine spontaneous emission β factor, which is the ratio between γ_pl and all possible decay channels. It is shown that the decrease in width of the gap results in much larger β factor. As the gap width decreases, fraction of modal power in the metal increases slowing down the plasmon mode resulting in an enhancement in coupling efficiency. The optimized β factor for a square metallic slot waveguide is estimated up to 80%.

Citation Download Citation

C. Perera and K. C. Vernon "Simulation of the gap plasmon coupling with a quantum dot", Proc. SPIE 8923, Micro/Nano Materials, Devices, and Systems, 89230Z (7 December 2013); https://doi.org/10.1117/12.2033300

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