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Related Experiment Videos

Efficient Second-Harmonic Generation in Nanocrystalline Silicon Nanoparticles.

Sergey V Makarov1, Mihail I Petrov1, Urs Zywietz2

  • 1Department of Nanophotonics and Metamaterials, ITMO University , St. Petersburg 197101, Russia.

Nano Letters
|April 15, 2017
PubMed
Summary

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This summary is machine-generated.

Resonantly excited nanocrystalline silicon nanoparticles show strong second-harmonic generation (SHG), outperforming unstructured silicon films and plasmonic nanostructures. This discovery enables new possibilities for silicon-based nonlinear nanoantennas and integrated light sources.

Area of Science:

  • Nanophotonics
  • Nonlinear Optics
  • Materials Science

Background:

  • High-index dielectric nanoparticles are explored in nanophotonics for low losses and enhanced nonlinear effects.
  • Silicon nanoparticles typically exhibit third-harmonic generation due to silicon's centrosymmetric nature.
  • Previous research focused on third-harmonic generation in silicon nanoparticles, overlooking other nonlinear phenomena.

Purpose of the Study:

  • To demonstrate strong second-harmonic generation (SHG) in nanocrystalline silicon nanoparticles.
  • To investigate the role of nanocrystalline structure and Mie resonances in enhancing nonlinear optical properties.
  • To compare the SHG efficiency of silicon nanoparticles with unstructured silicon films and plasmonic nanostructures.

Main Methods:

Keywords:
Mie scatteringNonlinear nanophotonicscrystallization kineticsdielectric nanoantennasmagnetic dipole resonancesecond-harmonic generationsilicon nanoparticles

Related Experiment Videos

  • Fabrication of nanocrystalline silicon nanoparticles using an optimized laser printing technique.
  • Experimental characterization of second-harmonic generation (SHG) from single silicon nanoparticles.
  • Theoretical modeling to understand the underlying mechanisms of nonlinear optical effects.

    • Main Results:

    • Demonstrated efficient second-harmonic generation (SHG) from resonantly excited nanocrystalline silicon nanoparticles.
    • Observed SHG efficiency from a single silicon nanoparticle is 2 orders of magnitude higher than from unstructured silicon films.
    • The nanocrystalline structure supports Mie resonances, significantly boosting nonlinear conversion yield.

    Conclusions:

    • Nanocrystalline silicon nanoparticles exhibit strong SHG, challenging previous assumptions about silicon's nonlinear optical behavior.
    • The demonstrated efficient SHG is superior to many plasmonic nanostructures and small silicon nanoparticles in the visible range.
    • These findings pave the way for designing advanced nonlinear nanoantennas and integrated silicon-based light sources.