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When a droplet hits the surface of water, it is often observed that a water column, or ‘back‐jet’, surges upwards. Counterintuitive though it might be, a similar phenomenon can occur when ultrafast light pulses shine on a nanostructured metal surface. These sub‐wavelength ‘nanojets’ occur in the regions of highest local field enhancements. For more details, see the article by V. K. Valev et al. on page OP29...
In response to the incident light's electric field, the electron density oscillates in the plasmonic hotspots producing an electric current. Associated Ohmic losses raise the temperature of the material within the plasmonic hotspot above the melting point. A nanojet and nanosphere ejection can then be observed precisely from the plasmonic hotspots.
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