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