Michael P. Nielsen

TL;DR: An all-dielectric germanium nanosystem exhibiting a strong third order nonlinear response and efficient third harmonic generation in the optical regime and the nonlinear conversion via the anapole mode outperforms that via the radiative dipolar resonances by about 1 order of magnitude is presented.

TL;DR: This work demonstrates that a higher-order anapole mode in a 200 nm thick germanium nanodisk delivers the highest THG efficiency on the nanoscale at optical frequencies and unveils the anapoles near-field intensity distributions, which show excellent agreement with numerical simulations.

TL;DR: Efficient four-wave mixing (FWM) over micrometer-scale interaction lengths at telecommunications wavelengths on silicon is reported, using an integrated plasmonic gap waveguide that strongly confines light within a nonlinear organic polymer and generating a non linear response so strong that efficient FWM accumulates over wavelength-scale distances.

TL;DR: In this paper, a single Ge nanodisk, recently demonstrated as an efficient source of third-harmonic generation (THG), can also be exploited for four-wave mixing (FWM) phenomena.

TL;DR: This work shows that an individual GaP nanodisk can yield differential reflectivity modulations of up to ~40%, with characteristic modulation times between 14 and 66 fs, when probed at the anapole excitation (AE), placing GaP nanoantennas as a promising choice for ultrafast all-optical modulation at the nanometer scale.