Although shaping of fields around nanostructures is widely studied in plasmonics, the influence of the field inside the nanostructures is often overlooked. The linear field distribution inside the structure taken to the third power causes third-harmonic generation, a nonlinear optical response of matter. We demonstrate how this simple fact can be used to shape complex fields around a single particle alone. We employ this scheme to switch the emission from a single point to two spatially separated but coherent sources.

© 2017 IEEE

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