Enhanced Second-Harmonic Generation with Structured Light in AlGaAs Nanoparticles Governed by Magnetic Response

@article{MelikGaykazyan2018EnhancedSG,
  title={Enhanced Second-Harmonic Generation with Structured Light in AlGaAs Nanoparticles Governed by Magnetic Response},
  author={Elizaveta V. Melik-Gaykazyan and Kirill L. Koshelev and J.-H. Choi and Sergey S. Kruk and H.-G. Park and Andrey A. Fedyanin and Yuri S. Kivshar},
  journal={JETP Letters},
  year={2018},
  volume={109},
  pages={131-135}
}
We employ structured light for the second-harmonic generation from subwavelength AlGaAs nanoparticles that support both electric and magnetic multipolar Mie resonances. The vectorial structure of the pump beam allows addressing selectively Mie-resonant modes and control the strength of the generated nonlinear fields. We observe experimentally the enhancement of the second-harmonic generation for the azimuthally polarized vector beams near the magnetic dipole resonance, and match our… 
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