Nanoantenna-controlled radiation pattern of the third-harmonic emission
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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.
KeywordsRadiation Pattern Fuse Silica Substrate Glass Interface Measured Radiation Pattern Focal Plane Imaging
We thank Harald Fuchs for granting access to the evaporator. We gratefully acknowledge financial support by the Deutsche Forschungsgemeinschaft (SPP 1391).