Abstract
High-permittivity III-V semiconductor nanocavities have shown huge potential for enhanced nonlinear light-matter interactions at the nanoscale. In particular, Second Harmonic (SH) generation in AlGaAs nanoantennas can be extremely efficient; however, vertical emission is difficult to achieve, due to the zincblende χ <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">(2)</sup> tensor and epitaxially growth on (100) substrates. Here, we demonstrate that we can shape the second harmonic radiation pattern from a single AlGaAs nanostructure by exploiting a geometrical symmetry breaking optimization approach. The optimized design allows to redirect the SH signal toward the normal direction and to increase the SH power collection efficiency by 2 orders of magnitude in a small numerical aperture of 0.1 with respect to the symmetrical counterpart structure.
Highlights
Optical antennas have recently attracted a lot of attention due to their potential application in different research areas [1]–[3]
All-dielectric optical resonators present two fundamental properties that are absent in plasmonics: extremely low losses in the infra-red spectral region, which results in high radiation efficiency, and multipolar nature of both electric and magnetic internal resonant fields [9]–[11]
We rescale the aforementioned concept to dielectric nanoantennas
Summary
Optical antennas have recently attracted a lot of attention due to their potential application in different research areas [1]–[3]. We demonstrate that we can shape the second harmonic radiation pattern from a single AlGaAs nanostructure by exploiting a geometrical symmetry breaking optimization approach.
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