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Anomalous reflection phase of graphene plasmons and its influence on resonators

A. Yu. Nikitin, T. Low, and L. Martin-Moreno
Phys. Rev. B 90, 041407(R) – Published 14 July 2014
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Abstract

The phase picked up by a graphene plasmon upon scattering by an abrupt edge is commonly assumed to be π. Here, it is demonstrated that for high plasmon momenta this reflection phase is 3π/4, virtually independent on either chemical potential, wavelength, or dielectric substrate. This nontrivial phase arises from a complex excitation of highly evanescent modes close to the edge, which are required to satisfy the continuity of electric and magnetic fields. A similar result for the reflection phase is expected for other two-dimensional systems supporting highly confined plasmons (very thin metal films, topological insulators, transition polaritonic layers, etc.). The knowledge of the reflection phase, combined with the phase picked up by the plasmon upon propagation, allows for the estimation of resonator properties from the dispersion relation of plasmons in the infinite monolayer.

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  • Received 16 April 2014
  • Revised 21 June 2014

DOI:https://doi.org/10.1103/PhysRevB.90.041407

©2014 American Physical Society

Authors & Affiliations

A. Yu. Nikitin1,2, T. Low3, and L. Martin-Moreno4,*

  • 1CIC nanoGUNE Consolider, E-20018 Donostia-San Sebastián, Spain
  • 2Ikerbasque, Basque Foundation for Science, E-48011 Bilbao, Spain
  • 3IBM Thomas J. Watson Research Center, Yorktown Heights, New York 10598, USA
  • 4Instituto de Ciencia de Materiales de Aragon and Departamento de Fisica de la Materia Condensada, CSIC-Universidad de Zaragoza, E-50009 Zaragoza, Spain

  • *lmm@unizar.es

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Issue

Vol. 90, Iss. 4 — 15 July 2014

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