Vertical Second Harmonic Generation in Asymmetric Dielectric Nanoantennas

Year: 2020

Authors: Rocco D., Gigli C., Carletti L., Marino G., Vincenti MA., Leo G., De Angelis C.

Autors Affiliation: ‎Univ Brescia, Dept Informat Engn, Via Branze 38, I-25123 Brescia, Italy;‎ CNR INO, Natl Inst Opt, Via Branze 45, I-25123 Brescia, Italy;‎ Univ Paris, Mat & Phenomenes Quant, 10 Rue Alice Domon & Leonie Duquet, F-75013 Paris, France; Univ Padua, Dept Informat Engn, Via Gradenigo 6, I-35131 Padua, Italy

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 chi((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.


Volume: 12 (3)      Pages from: 4500507-1  to: 4500507-7

More Information: This work was supported in part by MIUR Ministero dell´Istruzione, dell´Universita e della Ricerca (2017MP7F8F) and in part by CNR Consiglio Nazionale delle Ricerche (Joint Lab Project).
KeyWords: Dielectrics; Antenna radiation patterns; Substrates; Nonlinear optics; Optical harmonic generation; Optical resonators; Gratings; Nonlinear optics devices; optical harmonic generation; optical resonator
DOI: 10.1109/JPHOT.2020.2988502

Citations: 25
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