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

  Articoli su Riviste JCR/ISI  (anno 2018)

Autori:  Rocco D., Vincenti M.A., De Angelis C

Affiliazione Autori:  Univ Brescia, Dept Informat Engn, Via Branze 38, I-25123 Brescia, Italy; Natl Inst Opt INO, Via Branze 45, I-25123 Brescia, Italy

Riassunto:  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.

Rivista/Giornale:  APPLIED SCIENCES-BASEL
Volume n.:  8 (11)      Pagine da: 2212-1  a: 2212-10
DOI: 10.3390/app8112212


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