Nanofocusing of optical energy in tapered plasmonic waveguides.

By M. Stockman. Physical Review Letters, 2004

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Nanoantennas for visible and infrared radiation (2011, background): “This is an effect also exploited in the adiabatic focusing of plasmons in a tapered wire [47, 48].”
Plasmonic generation of ultrashort extreme-ultraviolet light pulses (2011, background): “In nanostructured tapered waveguides, SPPs can be controlled to adiabatically follow the geometric shape of the waveguide and asymptotically stop at the tip of the taper where the local cross-sectional dimension becomes infinitesimally smal”
Confinement and propagation characteristics of subwavelength plasmonic modes (2008, background): “CyPPs, which were in fact the first geometry proposed for nanoscale focusing [24, 25 ], offer the strongest overall energy confinement of all the structures that we have considered.”
Plasmonics for extreme light concentration and manipulation. (2010, background): “Such structures support SPP waves that show an increase in wavevector and a decrease in group velocity as they propagate towards their ape”
Plasmonic near-field transducer for heat-assisted magnetic recording (2014, background): “The idea of plasmonic taper that produces a hot spot with a significant fraction of energy deposited at the tip was first established in [60].”