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Spectral super-resolution in metamaterial composites

In English

Författare

Summary, in English

We investigate the optical properties of periodic composites containing metamaterial inclusions in a normal material matrix. We consider the case when these inclusions have sharp corners and, following Hetherington and Thorpe, use analytic results to argue that it is then possible to deduce the shape of the corner (its included angle) by measurements of the absorptance of such composites when the scale size of the inclusions and period cell is much finer than the wavelength. These analytic arguments are supported by highly accurate numerical results for the effective permittivity function of such composites as a function of the permittivity ratio of inclusions to the matrix. The results show that this function has a continuous spectral component with limits independent of the area fraction of inclusions, and with the same limits for both square and staggered square arrays. For staggered arrays where the squares are almost touching, the absorption spectrum is an extremely sensitive probe of the inclusion separation distance and acts like a Vernier scale.

Avdelning/ar

Publiceringsår

2011

Språk

Engelska

Publikation/Tidskrift/Serie

New Journal of Physics

Volym

13

Issue

11

Dokumenttyp

Artikel i tidskrift

Förlag

IOP Publishing

Ämne

  • Mathematics

Nyckelord

  • Optical properties
  • Microscopic defects
  • Permittivity

Status

Published

Forskningsgrupp

  • Harmonic Analysis and Applications
  • Harmonic Analysis and Applications

ISBN/ISSN/Övrigt

  • ISSN: 1367-2630