Boosting Second Harmonic Radiation from AlGaAs Nanoantennas with Epsilon-Near-Zero Materials

Year: 2018

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.


Volume: 8 (11)      Pages from: 2212-1  to: 2212-10

KeyWords: optical nanoantennas; linear and nonlinear nanoantennas; epsilon-near-zero materials; generation; permittivity
DOI: 10.3390/app8112212

Citations: 19
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