Photon excitation of surface plasmons in diffraction gratings: Effect of groove depth and spacing

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Abstract
Experimental data for three gratings of different groove profile and spacing are presented together with calculations using a recently developed theory which predicts the probability for photon-to-surface-plasmon conversion in terms of the surface profile and dielectric function of the metal coating of the grating. Theory and experiment are in reasonable agreement and indicate that the magnitude of photon-to-surface-plasmon coupling increases with both increasing groove depth and decreasing groove spacing.