Low angular-dispersion microwave absorption of a dual-pitch nondiffracting metal bigrating

Lockyear, Matthew J.; Hibbins, Alastair P.; Sambles, J. Roy; Lawrence, Christopher R.
July 2003
Applied Physics Letters;7/28/2003, Vol. 83 Issue 4, p806
Academic Journal
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<λ[sub0]<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.


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