Directive and enhanced spontaneous emission using shifted cubes nanoantenna
Abstract
Recent studies have demonstrated that nano-patch antennas formed by metallic nanocubes placed on top of a metallic film largely enhance the spontaneous emission rate of quantum emitters due to the confinement of the electromagnetic field in the small nanogap cavity. The popularity of this architecture is, in part, due to the ease in fabrication. In this contribution, we theoretically demonstrate that a dimer formed by two metallic nanocubes embedded in a dielectric medium exhibits enhanced emission rate compared to the nano-patch antenna. Furthermore, we compare the directivity and radiation efficiency of both nanoantennas. From these characteristics, we obtained information about the “material efficiency” and the coupling mismatch efficiency between a dipole emitter and the nanoantenna. These quantities provide a more intuitive insight than the Purcell factor or localized density of states, opening new perspectives in nanoantenna design for ultra-directive light emission.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Sep 02, 2016
- Source ID
- 10.1063/1.4962164
Entities
People
- B. Bahari
- B. Kante
- Ricardo Tellez-Limon
Organizations
- National Science Foundation
- Office of Naval Research
- University of California, San Diego