期刊
APPLIED SCIENCES-BASEL
卷 9, 期 16, 页码 -出版社
MDPI
DOI: 10.3390/app9163381
关键词
nanophotonics; nonlinear optics; second-harmonic generation; Mie resonances
类别
资金
- US Army Research Office [W911NF-18-1-0424]
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 similar to 1GW/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.
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