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Second-Harmonic Generation in Mie-Resonant GaAs Nanowires

1
Department of Information Engineering, University of Padova, 35131 Padova, Italy
2
Department of Information Engineering, University of Brescia, 25123 Brescia, Italy
3
Charles M. Bowden Research Lab, US Army AMRDEC, Huntsville, AL 35898, USA
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(16), 3381; https://doi.org/10.3390/app9163381 (registering DOI)
Received: 15 July 2019 / Revised: 8 August 2019 / Accepted: 14 August 2019 / Published: 16 August 2019
(This article belongs to the Special Issue Recent Advances in Plasmonics and Nanophotonics)
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Abstract

We investigate the enhancement of second-harmonic generation in cylindrical GaAs nanowires. Although these nanostructures confine light in two dimensions, power conversion efficiencies on the order of 10 5 with a pump peak intensity of ~ 1   GW / cm 2 are possible if the pump and the second-harmonic fields are coupled to the Mie-type resonances of the nanowire. We identify a large range of nanowire radii in which a double-resonance condition, i.e., both the pump and the second-harmonic fields excite normal modes of the nanowire, induces a high-quality-factor peak of conversion efficiency. We show that second-harmonic light can be scattered with large efficiency even if the second-harmonic photon energy is larger than 1.42 eV, i.e., the electronic bandgap of GaAs, above which the material is considered opaque. Finally, we evaluate the efficiency of one-photon absorption of second-harmonic light and find that resonant GaAs nanowires absorb second-harmonic light in the near-field region almost at the same rate at which they radiate second-harmonic light in the far-field region. View Full-Text
Keywords: nanophotonics; nonlinear optics; second-harmonic generation; Mie resonances nanophotonics; nonlinear optics; second-harmonic generation; Mie resonances
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de Ceglia, D.; Carletti, L.; Vincenti, M.A.; De Angelis, C.; Scalora, M. Second-Harmonic Generation in Mie-Resonant GaAs Nanowires. Appl. Sci. 2019, 9, 3381.

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