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Controlled Second Harmonic Generation with Optically Trapped Lithium Niobate Nanoparticles.

Zacharie Behel1, Yannick Mugnier2, Ronan Le Dantec2

  • 1Institut Lumière Matière, UMR CNRS 5306, Université Claude Bernard Lyon 1, F-69622 Villeurbanne, France.

Nano Letters
|May 2, 2024
PubMed
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We demonstrate controlled second harmonic generation (SHG) from single lithium niobate nanoparticles. This breakthrough enables new applications in sensing and information technologies using nanoparticle metasurfaces.

Area of Science:

  • Nonlinear Optics
  • Nanophotonics
  • Materials Science

Background:

  • Lithium niobate nanoparticles exhibit significant nonlinear optical properties.
  • Controlling light-matter interactions at the nanoscale is crucial for advanced photonic devices.
  • Second Harmonic Generation (SHG) is a key nonlinear optical phenomenon.

Purpose of the Study:

  • To investigate and control the SHG response from individual lithium niobate nanoparticles.
  • To explore the transition between coherent SHG and hyper-Rayleigh scattering (HRS).
  • To lay the groundwork for active, substrateless metasurfaces.

Main Methods:

  • Optical trapping of single lithium niobate nanoparticles (34 nm diameter).
  • Femtosecond laser source for inducing SHG emission.
Keywords:
Holographic Optical TweezersLithium NiobateNanoparticleOptical TrappingSecond Harmonic Generation

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  • Spatial light modulator to precisely control nanoparticle position relative to the laser focus.

    • Main Results:

    • Demonstrated SHG from single and multiple trapped nanoparticles.
    • Observed and distinguished between coherent SHG and incoherent hyper-Rayleigh scattering (HRS).
    • Achieved controlled switching of SHG intensity by manipulating nanoparticle position.

    Conclusions:

    • Controlled SHG from single nanoparticles is feasible.
    • This technique offers new possibilities for nanoparticle characterization.
    • Opens avenues for applications in sensing, communication, and active metasurfaces.