Figure 2 | Understanding the edge-assisted selective excitation of ghost polariton mode. (IMAGE)
Caption
Figure 2 | Understanding the edge-assisted selective excitation of ghost polariton mode. (a) Electric field induced by a dipole, and a dipole array. The idea is to match the dipole array with the wavefront of a certain long-propagating ghost polariton mode. (b) Linecut along dashed lines in (a). Using a dipole array greatly enhances the propagation length. (c) s-SNOM measurements using a triangular antenna. The excited wave shows a wavefront that’s parallel to the antenna’s edge. (d)(e) Explanation of edge-assisted mode excitation. By controlling the wave vector matching with edge direction, certain g-HP mode can be selectively excited. (f) FFT of the profile shown in (c). Bright spot represents the excited g-HP mode, whose position is consistent with our theoretical prediction.
Credit
Manuka Suriyage et al.
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