Publications
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Modal Analysis in Uunderstanding the Optical Rresponse of a Nanoantenna KU Leuven
This paper describes the use of modal analysis in understanding the optical response of a nanoantenna. First of all, the light-nanoantenna problem for a given incident field is formulated by a Volumetric Integral Equation (VIE). Then, standard and non-standard eigenvalue problems for nanoantennas are introduced and numerically implemented within the framework of the Volumetric Method of Moments (V-MoM) algorithm. The standard and non-standard ...
On the use of group theory in understanding the optical response of a nanoantenna KU Leuven
Symmetry holds a prominent position in defining the optical response of a nanoantenna. In this work, we harness a mathematical tool, group representation theory, combine it with the eigenmode analysis for a nanoantenna, and illustrate how the symmetry allows or forbids the energetic coupling (i.e., interference) between a nanoantenna's eigenmodes. We do this especially using a nanobar structure and a symmetric cross structure. Further, the ...
Unidirectional Side Scattering of Light by a Single-Element Nanoantenna KU Leuven
Unidirectional side scattering of light by a single-element plasmonic nanoantenna is demonstrated using full-field simulations and back focal plane measurements. We show that the phase and amplitude matching that occurs at the Fano interference between two localized surface plasmon modes in a V-shaped nanoparticle lies at the origin of this effect. A detailed analysis of the V-antenna modeled as a system of two coherent point-dipole sources ...
Unidirectional scattering and emission of light mediated by a single-element nanoantenna KU Leuven
© 2014 Optical Society of America. A V-shaped single-element metallic nanoantenna is found to enable unidirectional scattering of light. We experimentally and by means of FDTD simulations show unidirectional scattering of a plane wave and unidirectional emission from photo luminescent molecules coupled to the antenna. An eigenmode analysis reveals the physical origin of this effect and elegantly explains how the direction of the scattered light ...
On a Boundary Element Method (BEM) for the Nonlocal Hydrodynamic Response of a Nanoantenna KU Leuven
© 2018 IEEE. Within the framework of the Boundary Element Method (BEM), we develop a computational scheme to account for nonlocal hydrodynamic effects in three -dimensional metallic nanoparticles of arbitrary shape. In contrast to conventional field-based methods, the reported scheme is formulated based on vector and scalar potentials. Especially, an extra scalar potential is introduced to describe longitudinal fields due to the hydrodynamic ...
Unidirectional emission of a quantum dot coupled to a nanoantenna Ghent University
Nanoantenna enhanced emission of light-harvesting complex 2 : the role of resonance, polarization, and radiative and non-radiative rates Ghent University
Novel Wire-Grid Nano-Antenna Array with Circularly Polarized Radiation for Optical Communication Systems KU Leuven
A new circularly polarized wire-grid nano-antenna array designed for optical telecommunication applications is proposed in this paper. The array consists of two groups of radiators, which are orthogonal to each other. Each group consists of six aligned radiators connected via nonradiating connectors. A 90° phase shift is achieved by inserting a gap between the feeding coupling rods and the inner radiators of one of the two antenna groups. The ...