Abstract
Metallic gratings may give rise to coupling of radiation to surface plasmons even when the grating is zero-order, that is there are no real diffracted beams. This coupling occurs when the grating grooves are so deep that the conventional dispersion curve for surface plasmons on a flat interface is so strongly perturbed by the deep grating grooves that direct, radiative, coupling may occur without the requirement of in-plane momentum enhancement. A consequence of this is strong absorption of incident radiation by such deeply corrugated metal surfaces provided the incident radiation is polarised in a direction orthogonal to the grating grooves. In addition there is substantial electromagnetic field enhancement associated with the surface plasmon mode excitation. A physical interpretation of the surface plasmon resonances on these deeply grooved surfaces is that they are coupled resonances arising from the plasmons on opposite sides of a metallic groove coupling across from one side of the narrow groove to the other. Modelling for deep zero order gratings confirms the nature of this new family of coupled standing wave surface plasmons for both conventional as well as highly blazed, overhanging, grating grooves.
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Sambles, J.R., Preist, T.W., Tan, W.C., Wanstall, N.P. (2001). Surface Plasmons and Zero Order Metal Gratings. In: IUTAM Symposium on Mechanical and Electromagnetic Waves in Structured Media. Solid Mechanics and Its Applications, vol 91. Springer, Dordrecht. https://doi.org/10.1007/0-306-46955-3_22
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DOI: https://doi.org/10.1007/0-306-46955-3_22
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