102. DIRECTIONAL METALLIC NANOCUBE-DIMER ANTENNA FOR THE ENHANCEMENT OF THE SPONTANEOUS EMISSION RATE OF QUANTUM DOTS

Department: Electrical & Computer Engineering
Faculty Advisor(s): Boubacar Kante

Primary Student
Name: Babak Bahari
Email: bbahari@ucsd.edu
Phone: 858-534-4939
Grad Year: 2019

Student Collaborators
Ricardo Tellez-Limon, rtellezlimon@eng.ucsd.edu

Abstract
In recent studies has been demonstrated that nano-patch antennas formed by metallic nanocubes placed on top of a metallic layer, largely enhances the spontaneous emission rate of photons due to the confinement of the electromagnetic field in the small nanogap cavity. This rate is usually characterized by the Purcell factor. In this contribution, we theoretically demonstrate that the quadrupolar mode of a dimer formed by two metallic nanocubes increases the Purcell factor up to two times in comparison to the nano-patch antenna. Since this enhancement is related to the sharp edges and corners of the nanocubes, we also bring a quantitative description of its dependence as a function of the curvature radius for both, dimer and nano-patch antennas. Also we studied the nanoantenna in terms of the directivity and efficiency of its radiation pattern. From these parameters, we obtained information of the material efficiency as a function of the dissipation, and the coupling mismatch efficiency between a dipole emitter and the nanoantenna. These quantities provide more intuitive information for the design of nanoantennas, rather than the Purcell factor or LDOS measurements. The performed analysis opens new perspectives on the design of nanoantennas and applications of new fabrication techniques of self-assembled metallic nanocubes.

Industry Application Area(s)
Electronics/Photonics

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