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Multipolar optically induced electric and magnetic resonances in the ellipsoidal nanoparticles
Author(s): Reena .; Inder Devi; Yogita Kalra; R. K. Sinha
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Paper Abstract

In this paper, electric and magnetic resonances induced in the ellipsoidal dielectric nanoparticles in the optical range have been analyzed. Circular displacement currents excited inside the elliptical nano-particles by the incident light result in magnetic dipolar resonance in the dielectric nanoparticles. Kerker’s type scattering is observed due to the mutual interference of electric and magnetic resonances. The effect on the resonance conditions with the variation in the relative permittivity from Er= 5 to Er= 20 of the ellipsoidal nanoparticle has been observed. It has been analyzed that peaks of electric and magnetic resonances come closer by decreasing the electric permittivity of the nanoparticle, which leads to the increase in the directionality in the forward direction, as verified using Generalized Kerker’s condition. Further, far field scattering patterns have been obtained using the finite element method. Here, the electric and magnetic resonances have been optically induced up to quadrupolar modes. There is enhancement of the directionality in the forward direction when electric and magnetic resonances are in phase. Further, the effect of size of the linear array of ellipsoidal nanoparticles on the directionality has been analyzed. It has been observed that there is increase in the directivity by increasing the chain of the nanoparticles. Thus, the ellipsoidal nanoparticles can lead to the design of low loss and highly directional optical nanoantennas.

Paper Details

Date Published: 16 September 2016
PDF: 8 pages
Proc. SPIE 9919, Nanophotonic Materials XIII, 99190T (16 September 2016); doi: 10.1117/12.2237817
Show Author Affiliations
Reena ., Delhi Technological Univ. (India)
Inder Devi, Delhi Technological Univ. (India)
Yogita Kalra, Delhi Technological Univ. (India)
R. K. Sinha, Delhi Technological Univ. (India)
Central Scientific Instruments Organisation (India)


Published in SPIE Proceedings Vol. 9919:
Nanophotonic Materials XIII
Stefano Cabrini; Gilles Lérondel; Adam M. Schwartzberg; Taleb Mokari, Editor(s)

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