title: Plasmonic control of radiative properties of semiconductor quantum dots coupled to plasmonic ring cavities.
abstract: In recent years, a lot of effort has been made to achieve controlled delivery of target particles to the hotspots of plasmonic nanoantennas, in order to probe and/or exploit the extremely large field enhancements produced by such structures. While in many cases such high fields are advantageous, there are instances where they should be avoided. In this work, we consider the implications of using the standard nanoantenna geometries when colloidal quantum dots are employed as target entities. We show that in this case, and for various reasons, dimer antennas are not the optimum choice. Plasmonic ring cavities are a better option despite low field enhancements, as they allow collective coupling of many quantum dots in a reproducible and predictable manner. In cases where larger field enhancements are required, or for larger quantum dots, nonconcentric ring-disk cavities can be employed instead.
authors.affiliation: EXSS Group, Physics Department, Imperial College London, London, SW7 2AZ, U.K.
authors.forename: Aliaksandra
authors.initials: A
authors.lastname: Rakovich
authors.affiliation: EXSS Group, Physics Department, Imperial College London, London, SW7 2AZ, U.K.
authors.forename: Pablo
authors.initials: P
authors.lastname: Albella
authors.affiliation: EXSS Group, Physics Department, Imperial College London, London, SW7 2AZ, U.K.
authors.forename: Stefan A
authors.initials: SA
authors.lastname: Maier
keywords: 2-step EBL; decay rate enhancement; nonconcentric ring-disk cavities; plasmonic antennas; plasmonic ring cavities; quantum dots