Vertical Second Harmonic Generation in Asymmetric Dielectric Nanoantennas

IEEE Photonics Journal

Luca Carletti¹  Giuseppe Leo¹  Davide Rocco²  Costantino De Angelis²  Giuseppe Marino³  Carlo Gigli⁴  Maria Antonietta Vincenti⁴ 

[1] de Paris, Paris, France;Department of Information Engineering, University of Brescia, Brescia, Italy;Department of Information Engineering, University of Padova, Padova, Italy;Matériaux et Phénomènes Quantiques, Universit&x00E9;

关键词: Nonlinear optics devices;    optical harmonic generation;    optical resonator;   

DOI  :  10.1109/JPHOT.2020.2988502

来源: DOAJ

【 摘 要 】

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⁽²⁾ 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.

【 授权许可】

Unknown