Spectral super-resolution in metamaterial composites
Author
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.
Department/s
- Mathematics (Faculty of Engineering)
- Harmonic Analysis and Applications
- eSSENCE: The e-Science Collaboration
Publishing year
2011
Language
English
Publication/Series
New Journal of Physics
Volume
13
Issue
11
Full text
- Available as PDF - 449 kB
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Links
Document type
Journal article
Publisher
IOP Publishing
Topic
- Mathematics
Keywords
- Optical properties
- Microscopic defects
- Permittivity
Status
Published
Research group
- Harmonic Analysis and Applications
- Harmonic Analysis and Applications
ISBN/ISSN/Other
- ISSN: 1367-2630