We demonstrate ultrafast modulation of the coupling efficiency of free-space radiation to a surface plasmon polariton mode on a gold film with a PMMA grating overlayer over a broad range of wavelengths (540--700 nm). We observe modulation magnitudes of up to 14% at the center of the resonance, or 61% at the outlying regions. The limitations of this method are explored using simulations of the nonequilibrium electron thermal dynamics of the gold and of the response of the grating structure.
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Rotenberg et al. (2009) studied this question.
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