Abstract
A periodically corrugated interface between vacuum and a high-index dielectric medium supports a p-polarized leaky surface electromagnetic wave whose sagittal plane is perpendicular to the generators of the interface. This wave is bound to the surface in the vacuum region, but radiates into the high-index dielectric medium. We study the excitation of this wave by p-polarized light incident from a prism on whose planar base the highindex dielectric medium in the form of a film is bonded. The unilluminated surface of the film is periodically corrugated, and is in contact with vacuum. Peaks and dips in the dependence of several low-order diffraction efficiencies on the angle of incidence (Wood anomalies) are the signatures of the excitation of the surface wave.
Highlights
In recent work1 the present authors have shown theoretically that a periodically corrugated interface between a high index dielectric medium and vacuum supports a p-polarized leaky surface electromagnetic wave
The calculation of the diffraction efficiencies with the assumption of incidence from a high-index dielectric medium sufficed for establishing a proof of concept for the existence of the leaky surface wave, it seemed that a more conventional approach to its observation would be useful to have
We will study the excitation of the leaky surface electromagnetic wave by the use of a prism-coupler geometry, known as the Kretschmann–Raether geometry
Summary
In recent work the present authors have shown theoretically that a periodically corrugated interface between a high index dielectric medium and vacuum supports a p-polarized leaky surface electromagnetic wave. This wave is bound to the surface in the vacuum and radiates into the high-index dielectric medium. In this study it was shown that this wave can be excited by a plane wave incident on the periodic vacuum-dielectric interface from the high-index medium, and observed through the Wood anomalies observed in the dependence of the reflectivity and other low-order diffraction efficiencies on the polar angle of incidence. Because the dispersion curve for the surface wave supported by this structure differs slightly from what it is for a wave propagating along a high-index grating in contact with vacuum, we calculate this dispersion curve by the solution of the homogeneous version of the reduced Rayleigh equation for this geometry to help in interpreting the diffraction results
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