Abstract
We present the third-harmonic emission pattern of single and multiple gold nanoantennas excited by few-cycle infrared laser pulses. The angular distribution of the nonlinear emission is measured by back focal plane imaging with a high-numerical-aperture objective lens. The third-harmonic emission of a single-rod antenna has a dipole-like radiation pattern modified at the air–glass interface. Simultaneous excitation of multiple antennas under the same laser focus results in interferences of the far-field third-harmonic radiation, which can be well explained using a dipole model.
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