Boosting Second Harmonic Radiation from AlGaAs Nanoantennas with Epsilon-Near-Zero Materials
Authors: Rocco D., Vincenti M.A., De Angelis C.
Autors Affiliation: Univ Brescia, Dept Informat Engn, Via Branze 38, I-25123 Brescia, Italy; Natl Inst Opt INO, Via Branze 45, I-25123 Brescia, Italy
Abstract: Enhancing the second harmonic conversion efficiency at the nanoscale is a critical challenge in nonlinear optics. Here we propose the use of epsilon-near-zero materials to boost the nonlinear radiation in the far field. Here, a comparison of the second harmonic behavior of a cylindrical AlGaAs nanoantenna placed over different semi-infinite layers is presented. In particular, we observed that the second harmonic generation is strongly enhanced and redirected by the simultaneous presence of a resonance at the fundamental wavelength and a low-permittivity condition in the substrate at the harmonic wavelength. Our results pave the way for a novel approach to enhance optical nonlinearities at the nanoscale.
Journal/Review: APPLIED SCIENCES-BASEL
Volume: 8 (11) Pages from: 2212-1 to: 2212-10
KeyWords: optical nanoantennas; linear and nonlinear nanoantennas; epsilon-near-zero materials; generation; permittivityDOI: 10.3390/app8112212Citations: 5data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2020-07-05References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here