Cloaking dielectric spheres by a shell of plasmonic and polaritonic nanoparticles

Mohamed Farhat; Stefan Mühlig; Alastair Cunningham; Thomas Bürgi; Carsten Rockstuhl; Falk Lederer

doi:10.1117/12.922286

1 May 2012 Cloaking dielectric spheres by a shell of plasmonic and polaritonic nanoparticles

Mohamed Farhat, Stefan Mühlig, Alastair Cunningham, Thomas Bürgi, Carsten Rockstuhl, Falk Lederer

Proceedings Volume 8423, Metamaterials VII; 84231D (2012) https://doi.org/10.1117/12.922286
Event: SPIE Photonics Europe, 2012, Brussels, Belgium

Abstract

This paper is dedicated to the study of plasmonic cloaking, based on the use of appropriate core-shell systems that may act as a cloaking devices for a finite range of frequencies. This cluster consists of an amorphous arrangement of metallic (gold or silver) and/or polaritonic nano-particles, which could be approximated in the quasistatic limit by an effective medium, having interesting properties such as a negative or very low permittivity and/or permeability in the optical domain with moderate losses. We first derive the effective properties of a shell made of such small spheres using the Maxwell-Garnett and Clausius-Mosotti formulas. We then numerically show that a dielectric core sphere is almost made invisible at optical frequencies with a scattering reduction of more than 70 percent. We finally derive some analytical expressions that we have compared to rigorous numerical simulations.

Citation Download Citation

Mohamed Farhat, Stefan Mühlig, Alastair Cunningham, Thomas Bürgi, Carsten Rockstuhl, and Falk Lederer "Cloaking dielectric spheres by a shell of plasmonic and polaritonic nanoparticles", Proc. SPIE 8423, Metamaterials VII, 84231D (1 May 2012); https://doi.org/10.1117/12.922286

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