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]
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.