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Bulletin of Pure and Applied Sciences- Physics (Started in 1982)
eISSN: 2320-3218
pISSN: 0970-6569
Impact Factor: 5.195 (2017)
DOI: 10.5958/2320-3218
Editor-in-Chief:  Prof. Madan jee,
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Article Details

Bulletin of Pure and Applied Sciences- Physics (Started in 1982)
Year : 2019, Volume & Issue : BPAS-Physics 38D(1), JAN-JUN 2019
Page No. : 27-31, Article Type : Original Aticle
Article DOI : 10.5958/2320-3218.2019.00005.8 (Received on 25.03.2019 Accepted on 03.05.2019)

Anomalous Electromagnetic Response of Composite Nanoparticle

Abdul Sattar Alam*, Ashok Kumar
Author’s Affiliation : Abdul Sattar Alam Research Scholar, University Department of Physics, B.N. Mandal University, Laloo Nagar, Madhepura, Bihar 852113, India E-mail: [email protected] Ashok Kumar University Department of Physics, B.N. Mandal University, Laloo Nagar, Madhepura, Bihar 852113, India E-mail: [email protected]

Corresponding Author : Abdul Sattar Alam, Research Scholar, University Department of Physics, B.N. Mandal University, Laloo Nagar, Madhepura, Bihar 852113, India,
E-Mail:-[email protected]


Abstract

We have analysed the anomalous electromagnetic response of composite nanoparticle formed by two conjoined half cylinders of arbitrary complex permittivity and radius. This geometry has been proposed in the special configuration to from a resonant optical nano circuit and attempts to analytically solved its scattering properties using mode matching analysis, integral transformation and coordinate mapping have led to non physical solutions and strong numerical instabilities. We have shown that these challenges are associated with counterintuitive resonant phenomena which leaded to continuous frequency range over which distributed Plasmon resonances may support unbounded values of absorption or gain efficiency i.e. finite absorption or grain even in the limit of infinitesimally small material loss/gain. We solved the complete scattering problem associated with this geometry derived closed form expressions for the induced fields inside and outside this composite particle. This solution provides valuable physical insights into the complex wave interaction of this particle over a broad range of frequencies which provide exciting possibilities for energy concentration, harvesting and spasars. This absorption paradox has been shown to be associated with the singularities in the geometry and the adiabatic focusing of broad band surface plasmons supported at the corners. A close form solution was derived for the scattering and absorption properties of the composite nanostructure and simple conditions on the material permittivity have been derived to control the position of the absorption band.

Keywords

Anomalous, nanoparticle, permittivity, scattering, Plasmon, resonance, concentration
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