Spectral and spatial investigation of midinfrared surface waves on a plasmonic grating

Ribaudo, T.; Adams, D. C.; Passmore, B.; Shaner, E. A.; Wasserman, D.
May 2009
Applied Physics Letters;5/18/2009, Vol. 94 Issue 20, p201109
Academic Journal
A patterned metal film with a periodic array of subwavelength apertures, fabricated upon a semiconductor substrate and designed to possess transmission resonances in the midinfrared is interrogated with a wavelength-tunable external cavity quantum cascade laser. The interaction of the coherent light with this plasmonic structure is studied using a spatially resolved transmission experiment, allowing for the far-field imaging of propagating waves on the surface of the metal film. Spatial and spectral transmission is investigated for a range of near-normal incidence angles. For nonzero angles of incidence, coupling of laser light, at distinct frequencies, to surface waves propagating in opposite directions is demonstrated.


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