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Low angular-dispersion microwave absorption of a dual-pitch nondiffracting metal bigrating
Lockyear, Matthew J.
Hibbins, Alastair P.
Sambles, J. Roy
Lawrence, Christopher R.
University of Exeter; QinetiQ Ltd, Farnborough
Applied Physics Letters
American Institute of Physics
The surface plasmon modes supported by a nondiffracting 90° bigrating consisting of three grooves per repeat period with one slightly shallower than the other two are characterized by studying the reflectivity from the structure as a function of the angle of incidence and the incident wavelength (11.3<λ0<16.7 mm). This structure supports two remarkably angle-independent modes plus a further, lower-energy mode which is more dispersive. Experimental reflectivity is compared with that calculated using a finite element model. In addition, to understand the character of each of the modes, the spatial form of the electromagnetic fields at the resonant frequencies are explored.
Copyright © 2003 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Applied Physics Letters 83 (2003) and may be found at http://link.aip.org/link/?APPLAB/83/806/1
83 (4), pp. 806-808