Photonics Research, 2018, 6 (5): 050000B6, Published Online: Apr. 11, 2019  

Tuning the second-harmonic generation in AlGaAs nanodimers via non-radiative state optimization [Invited]

Author Affiliations
1 Department of Information Engineering, University of Brescia, Via Branze 38, Brescia 25123, Italy
2 Matériaux et Phénomènes Quantiques, Université Paris Diderot, CNRS UMR 7162, 10 rue A. Domon et L. Duquet, 75013 Paris, France
3 Department of Physics, Politecnico di Milano, Piazza Leonardo Da Vinci 32, Milano 20133, Italy
4 National Institute of Optics (INO), Via Branze 45, Brescia 25123, Italy
5 Nonlinear Physics Centre, Research School of Physics and Engineering, The Australian National University, Canberra, ACT 2601, Australia
Abstract
Dielectric nanocavities are emerging as a versatile and powerful tool for the linear and nonlinear manipulation of light at the nanoscale. In this work, we exploit the effective coupling of electric and toroidal modes in AlGaAs nanodimers to locally enhance both electric and magnetic fields while minimizing the optical scattering, thereby optimizing their second-harmonic generation efficiency with respect to the case of a single isolated nanodisk. We also demonstrate that proper near-field coupling can provide further degrees of freedom to control the polarization state and the radiation diagram of the second-harmonic field.

Davide Rocco, Valerio F. Gili, Lavinia Ghirardini, Luca Carletti, Ivan Favero, Andrea Locatelli, Giuseppe Marino, Dragomir N. Neshev, Michele Celebrano, Marco Finazzi, Giuseppe Leo, Costantino De Angelis. Tuning the second-harmonic generation in AlGaAs nanodimers via non-radiative state optimization [Invited][J]. Photonics Research, 2018, 6(5): 050000B6.

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