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Keywords:
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Area of Science:

  • Nonlinear optics
  • Nanophotonics
  • Materials science

Background:

  • Silicon nanostructures offer tunable optical properties.
  • Third-harmonic generation (THG) is a key nonlinear optical process.
  • Understanding resonance-enhanced THG is crucial for device applications.

Purpose of the Study:

  • To investigate third-harmonic generation (THG) in silicon nanodisks.
  • To explore the role of electric and magnetic dipolar resonances in THG.
  • To quantify the enhancement of THG due to magnetic resonances.

Main Methods:

  • Fabrication of silicon nanodisks.
  • Experimental characterization using third-harmonic microscopy and spectroscopy.
  • Analysis of nonlinear optical response and conversion efficiency.

Main Results:

  • Enhanced THG observed from silicon nanodisks with coupled electric and magnetic dipolar resonances.
  • Significant THG enhancement near magnetic dipole resonances.
  • Up to two orders of magnitude increase in harmonic intensity compared to bulk silicon.
  • Two-photon absorption identified as the primary limitation to conversion efficiency.

Conclusions:

  • Silicon nanodisks with tailored resonances can dramatically enhance THG.
  • Magnetic dipole resonances are particularly effective for boosting nonlinear optical signals.
  • This work demonstrates the potential of silicon nanostructures for advanced nonlinear optical applications.