Self-induced trapping of quantum dots in nanocavities

Research output: Contribution to conference (unpublished)Abstract

Authors

Colleges, School and Institutes

External organisations

  • University of Pennsylvania, Philadelphia

Abstract

Nanocavities supporting plasmonic modes with extraordinary small mode volume are ideal systems for studying light–matter interaction and provide a natural platform for trapping quantum dots. It is only recently that the mapping of plasmon resonances in plasmonic nanostructures with more complex topology than spheres and cylinders (that can be described by Mie’s theory) is viable owing to the noteworthy increase of computational power along with the advances in computational electromagnetics. Still, the modelling of complex nanostructures demands in some cases unaffordable computational burden. This problem can be alleviated by championing analytical tools such as transformation optics.
This communication reports the analytical (based on conformal transformation) and numerical study (based on finite element method) of a nanoemitter inside a bowtie nanocavity. The contribution shows the strong dependence that the non-radiative Purcell enhancement has on the actual geometry of the bowtie nanocavity, and the position and polarization of the emitter. The strong variances observed in the non-radiative Purcell enhancement is also mirrored in the self-induced trapping ability of a colloidal ZnO quantum dot located inside the bowtie nanocavity. We observe though that the trapping force exceed the Brownian motion along the perimeter of the bowtie nanocavity regardless of the quantum dot photoluminescence polarization. This work demonstrates the potential that conformal transformation has for modelling cost-effectively plasmonic nanostructures.

Details

Original languageEnglish
Publication statusPublished - Sep 2018
EventPhoton 2018 - Aston University, Birmingham, United Kingdom
Duration: 3 Sep 20186 Sep 2018

Conference

ConferencePhoton 2018
CountryUnited Kingdom
CityBirmingham
Period3/09/186/09/18