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Related Experiment Video

Updated: Jul 31, 2025

Harmonic Nanoparticles for Regenerative Research
09:23

Harmonic Nanoparticles for Regenerative Research

Published on: May 1, 2014

11.7K

Enhanced surface second harmonic generation in nanolaminates.

Fatemeh Abtahi, Pallabi Paul, Sebastian Beer

    Optics Express
    |May 8, 2023
    PubMed
    Summary
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    Researchers enhanced surface second-harmonic generation (SHG) using periodic dielectric multilayer stacks. This method significantly boosts SHG beyond simple interfaces, offering new possibilities for nonlinear optics.

    Area of Science:

    • Nonlinear Optics
    • Materials Science
    • Surface Science

    Background:

    • Second-harmonic generation (SHG) is a nonlinear optical process forbidden in centrosymmetric media.
    • Surface SHG occurs due to broken inversion symmetry but is typically weak.
    • Periodic dielectric multilayers offer numerous surfaces for potential SHG enhancement.

    Purpose of the Study:

    • To experimentally investigate and enhance surface SHG using periodic dielectric multilayer stacks.
    • To explore the feasibility of fabricating ultrathin dielectric layers for SHG applications.
    • To determine the dependence of SHG on multilayer structure and angle of incidence.

    Main Methods:

    • Fabrication of alternating SiO2/TiO2 multilayer stacks using Plasma Enhanced Atomic Layer Deposition (PEALD).

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  • Achieved individual layer thicknesses below 2 nm.
  • Experimental measurement of SHG at large angles of incidence (> 20 degrees).

    • Main Results:

    • Demonstrated substantially enhanced surface SHG from periodic multilayer structures.
    • Observed SHG levels significantly exceeding those from simple interfaces.
    • Experimental results show good agreement with theoretical calculations for varying periods and thicknesses.

    Conclusions:

    • Periodic dielectric multilayers are effective for significantly enhancing surface SHG.
    • PEALD enables precise fabrication of ultrathin layers crucial for this enhancement.
    • This approach provides a pathway for developing novel nonlinear optical devices.