Figure 1 | Principle and experimental results of long-propagation ghost polariton wave. (IMAGE)
Caption
Figure 1 | Principle and experimental results of long-propagation ghost polariton wave. (a) Schematic diagram showing how the polariton can be excited using a gold antenna. An incident laser beam, after hitting the edge of the gold antenna, gets transformed into ghost polariton that travels along the calcite surface. (b) Propagation lengths of ghost polariton modes, visualized in momentum space. Based on our theoretical prediction, the longest propagation length can easily exceed 100 microns. (c) Electric field distribution of the g-HP mode highlighted in (b). While the electric field extends deep inside calcite crystal, the energy flow goes along the interface between calcite and air. (d)(e) s-SNOM measurements using (d) circular disk antenna, and (e) triangular antenna. The linecuts, as well as curve-fitting results, are also plotted. Utilizing a triangular antenna leads to selective excitation of certain long-propagating modes, thus showing a much longer propagation length compared with a round disk antenna.
Credit
Manuka Suriyage et al.
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CC BY