Monolithic AlGaAs second-harmonic nanoantennas: erratum

Surface-normal second harmonic emission from AlGaAs high-contrast gratings

Modelling And Optimization Of The Second-Harmonic Radiation Pattern In Dielectric Nanoantennas

We present numerical results that describe how to engineer the radiation pattern of the second harmonic (SH) signal generated by AlGaAs on aluminum oxide all-dielectric nanoantennas. The SH beam divergence is minimized by coherent forward and backward scattering of the radiation emitted at grazing angles from the optical antenna toward a concentric grating grown on the aluminum oxide substrate,...

Ultrasensitive optical shape characterization of gold nanoantennas using second harmonic generation.

Second harmonic generation from plasmonic nanoantennas is investigated numerically using a surface integral formulation for the calculation of both the fundamental and the second harmonic electric field. The comparison between a realistic and an idealized gold nanoantenna shows that second harmonic generation is extremely sensitive to asymmetry in the nanostructure shape even in cases where the...

Enhanced second-harmonic generation in AlGaAs/AlxOy tightly confining waveguides and resonant cavities.

We demonstrate second-harmonic generation (SHG) from sub-micrometer-sized AlGaAs/AlxOy artificially birefringent waveguides. The normalized conversion efficiency is the highest ever reported. We further enhanced the SHG using a waveguide-embedded cavity formed by dichroic mirrors. Resonant enhancements as high as approximately 10x were observed. Such devices could be potentially used as highly ...

Role of antenna modes and field enhancement in second harmonic generation from dipole nanoantennas.

We study optical second harmonic generation from metallic dipole antennas with narrow gaps. Enhancement of the fundamental-frequency field in the gap region plays a marginal role on conversion efficiency. In the symmetric configuration, i.e., with the gap located at the center of the antenna axis, reducing gap size induces a significant red-shift of the maximum conversion efficiency peak. Eithe...