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1 May 2012 Application of a grating coupler for surface plasmon polariton excitation in a photoemission electron microscopy experiment
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Abstract
Surface plasmon polariton (SPP) excitation at a gold-vacuum interface via 800 nm light pulses mediated by a periodic array of gold ridges is probed at high lateral resolution by means of photoemission electron microscopy (PEEM). We directly monitor and quantify the coupling properties as a function of the number of grating ridges and compare the PEEM results with analytic calculations. An increase in the coupling efficiency of ≈ 3 is observed when increasing the number of ridges from 1 to 6. We observe, however, that a further addition of ridges is rather ineffective. This saturation behavior is assigned to the grazing incidence excitation geometry intrinsic to a conventional PEEM scheme and the limited propagation distance of the SPP modes at the gold-vacuum interface at the used wavelength.
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Till Leißner, Stephan Jauernik, Christoph Lemke, Jacek Fiutowski, Kasper Thilsing-Hansen, Jakob Kjelstrup-Hansen, Horst-Günter Rubahn, and Michael Bauer "Application of a grating coupler for surface plasmon polariton excitation in a photoemission electron microscopy experiment", Proc. SPIE 8424, Nanophotonics IV, 84241D (1 May 2012); https://doi.org/10.1117/12.921761
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