Unbounded spatial spectrum of propagating waves in a polaritonic wire medium

M. S. Mirmoosa, S. Yu. Kosulnikov, and C. R. Simovski
Phys. Rev. B 92, 075139 – Published 26 August 2015

Abstract

In this paper, we study a topological phase transition in a wire medium operating at infrared frequencies. This transition occurs in the reciprocal space between the indefinite (open-surface) regime of the metamaterial and its dielectric (closed-surface) regime. Due to the spatial dispersion inherent to a wire medium, a hybrid regime turns out to be possible at the transition frequency. Both such surfaces exist at the same frequency and touch one another. At this frequency, all values of the parallel wave vector correspond to propagating spatial harmonics. The implication of this regime is the overwhelming radiation enhancement. We numerically investigate the gain in radiated power for a subwavelength dipole source submerged into such medium. In contrast to previous works, this gain (called the Purcell factor) turns out to be higher for a parallel dipole than for a perpendicular one.

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  • Received 24 April 2015
  • Revised 29 July 2015

DOI:https://doi.org/10.1103/PhysRevB.92.075139

©2015 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsAtomic, Molecular & Optical

Authors & Affiliations

M. S. Mirmoosa1, S. Yu. Kosulnikov1,2, and C. R. Simovski1,2

  • 1Department of Radio Science and Engineering, School of Electrical Engineering, Aalto University, P.O. Box 13000, FI-00076 AALTO, Finland
  • 2Department of Nanophotonics and Metamaterials, ITMO University, 197043 St. Petersburg, Russia

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Issue

Vol. 92, Iss. 7 — 15 August 2015

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