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Photonics 2015, 2(3), 773-794;

Eccentrically-Layered Active Coated Nano-Particles for Directive Near- and Far-Field Radiation

Department of Electrical Engineering, Technical University of Denmark, Ørsted Plads, Bldg. 348, DK-2800 Kgs. Lyngby, Denmark
Author to whom correspondence should be addressed.
Received: 8 May 2015 / Revised: 17 June 2015 / Accepted: 18 June 2015 / Published: 29 June 2015
(This article belongs to the Special Issue New Frontiers in Plasmonics and Metamaterials)
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The present work shows how the eccentricity in active nano-particles may lead to very interesting and rather directive near- and far-field radiation patterns. The nano-particle is of a three-layer type and consists of a silica core, a free-space middle layer and an outer silver shell and is excited by a magnetic line source. The constant frequency gain model is included in the silica core, and the eccentricity is introduced through appropriate displacements of the core. It is shown that the eccentricity in a nano-particle, which was initially designed to excite a strong dipole mode, causes a progressively larger excitation of several other (including higher order) modes, this being more so the larger the core displacement. Specifically, eccentric nano-particles are identified with comparable simultaneous excitations of dipole and quadrupole modes, with associated large values of the radiated power and, even more notably, enhanced and directive near- and far-field radiation patterns. The main beam of these patterns is shown to be effectively tailored (enhanced, reshaped and steered) by the direction and amount of the core displacement. The eccentric nano-particles can be additionally gain optimized to boost their near-field response and the radiated power, while retaining the directivity of the gain unoptimized eccentric cases. Owing to their very directive nearand far-field patterns, the proposed eccentric, active three-layer nano-particles may provide alternative strategies towards the design of directive nano-antennas relative to several of the existing solutions. View Full-Text
Keywords: eccentric nano-particles; nano-antennas; gain; directive scattering and radiation eccentric nano-particles; nano-antennas; gain; directive scattering and radiation

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Thorsen, R.Ø.; Arslanagić, S. Eccentrically-Layered Active Coated Nano-Particles for Directive Near- and Far-Field Radiation. Photonics 2015, 2, 773-794.

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