Excitation of remarkably nondispersive surface plasmons on a nondiffracting, dual-pitch metal grating

Hibbins, Alastair P.; Sambles, J. Roy; Lawrence, Chris R.
April 2002
Applied Physics Letters;4/1/2002, Vol. 80 Issue 13, p2410
Academic Journal
A nondiffracting metallic lamellar grating formed from three equally spaced grooves per repeat period, with one being slightly shallower than the other two is examined at microwave frequencies. When filled with a slightly lossy dielectric, this structure supports a remarkably nondispersive surface plasmon polariton mode, which exhibits strong selective absorption of incident power. Measured reflectivities show excellent agreement with the results predicted by a rigorous coupled wave theory.


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