Effectiveness of Thin Films in Lieu of Hyperbolic Metamaterials in the Near Field

Owen D. Miller, Steven G. Johnson, and Alejandro W. Rodriguez
Phys. Rev. Lett. 112, 157402 – Published 18 April 2014

Abstract

We show that the near-field functionality of hyperbolic metamaterials (HMM), typically proposed for increasing the photonic local density of states (LDOS), can be achieved with thin metal films. Although HMMs have an infinite density of internally propagating plane-wave states, the external coupling to nearby emitters is severely restricted. We show analytically that properly designed thin films, of thicknesses comparable to the metal size of a hyperbolic metamaterial, yield an LDOS as high as (if not higher than) that of HMMs. We illustrate these ideas by performing exact numerical computations of the LDOS of multilayer HMMs, along with their application to the problem of maximizing near-field heat transfer, to show that single-layer thin films are suitable replacements in both cases.

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  • Received 22 November 2013

DOI:https://doi.org/10.1103/PhysRevLett.112.157402

© 2014 American Physical Society

Authors & Affiliations

Owen D. Miller1, Steven G. Johnson1, and Alejandro W. Rodriguez2

  • 1Department of Mathematics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
  • 2Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA

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Issue

Vol. 112, Iss. 15 — 18 April 2014

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