Localized plasmons in graphene-coated nanospheres

Thomas Christensen, Antti-Pekka Jauho, Martijn Wubs, N. Asger Mortensen

Research output: Contribution to journalJournal articleResearchpeer-review

334 Downloads (Pure)

Abstract

We present an analytical derivation of the electromagnetic response of a spherical object coated by a conductive film, here exemplified by a graphene coating. Applying the framework of Mie-Lorenz theory augmented to account for a conductive boundary condition, we derive the multipole scattering coefficients, modified essentially through the inclusion of an additive correction in numerator and denominator. By reductionist means, starting from the retarded response, we offer simple results in the quasistatic regime by analyzing the multipolar polarizability and associated dispersion equation for the localized plasmons. We consider graphene coatings of both dielectric and conducting spheres, where the graphene coating in the former case introduces the plasmons and in the latter case modifies in interesting ways the existing ones. Finally, we discuss our analytical results in the context of extinction cross section and local density of states. Recent demonstrations of fabricated spherical graphene nanostructures make our study directly relevant to experiments.
Original languageEnglish
Article number125414
JournalPhysical Review B
Volume91
Issue number12
Number of pages8
ISSN0163-1829
DOIs
Publication statusPublished - 2015

Fingerprint Dive into the research topics of 'Localized plasmons in graphene-coated nanospheres'. Together they form a unique fingerprint.

Cite this