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3D-steering and superfocusing of second-harmonic radiation through plasmonic nano antenna arrays
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21.Note that the total second-harmonic field consists of direct second-harmonic emission (radiation emitted from an emitter A) and the scattered second-harmonic radiation (radiation emitted from A scattered on another emitter B in the neighborhood). Nevertheless, the scattered radiation is negligible compared to direct emission, as further model calculations have shown.
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Second-harmonic generation (SHG) of light at nanoparticles provides the possibility to generate light (of a desired frequency) in-situ instead of introducing it by focusing an external light beam. Our theoretical study provides steering SHG light through the superposition of the radiation from a number of nanoparticles which are arranged in a circle. The authors assume cone-shaped or rod-shaped nanoparticles. Their radiation can be modeled as radiating dipoles. The superposition of their fields yields a “hot spot” with a full width at half-maximum of around 100 nm. Even more important, the position of the hot spot within the circular arrangement of nanoantennas can be adjusted in the xy plane simply by changing the incident angle of the exciting beam.
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