Figure 2: Control of the surface plasmon-polariton field. | Nature Communications

Figure 2: Control of the surface plasmon-polariton field.

From: Simultaneous observation of the quantization and the interference pattern of a plasmonic near-field

Figure 2

(a) Spatial variation of the interferometric SPP field along the axis of the nanowire imaged in b. Black data points depict the background-subtracted SPP field strength integrated along the transverse direction, with the average distance between antinodes dav. determined from a multi-Gaussian fit (solid line). (b) Experimental PINEM image of the photoinduced SPP field distribution on an isolated nanowire (3.4 μm length, 45 nm radius) with light excitation polarized parallel to its longitudinal axis (800 nm, ϕ=0°). The image was recorded at Δt=0 ps, using only electrons that have gained energy. Electron counts in be are plotted using the same linear colour scale. The scale bar corresponds to 1 μm. (c) Corresponding finite-element simulation of the SPP field (|Ez| in the plane 10 nm below the wire) in the 800 nm, ϕ=0° geometry. The shaded area indicates the spatial projection of the nanowire, and the scale bar corresponds to 1 μm. (d) Experimental PINEM image of the SPP field distribution (at Δt=0 ps, using only electrons that have gained energy) on an isolated nanowire (5.7 μm length, 67 nm radius) under 800 nm, ϕ=45° excitation. The scale bar corresponds to 1 μm. Different wires were used for the two polarizations. (e) Corresponding finite-element simulation of the SPP field (|Ez| in the plane 10 nm below the wire) in the 800 nm, ϕ=45° geometry. The shaded area indicates the spatial projection of the nanowire, and the scale bar corresponds to 1 μm.

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