Third Harmonic Generation at Anapole Modes in Nanostructured All-dielectric Germanium Antennas

Y. LI; G. GRINBLAT; M. P. NIELSEN; R. F. OULTON; S. A. MAIER

Conferencia; Metamaterials; 2017

We present germanium nanosystems with a highly improved electric field confinement effect at anapole and higher-order modes, leading to third harmonic generation conversion efficiencies as large as 0.001% at an emission wavelength of 550 nm. The anapole near-field intensity distributions are unveiled by mapping the emission across the nanodisks, which show excellent agreement with numerical simulations.