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Broadband second-harmonic generation from artificial optical nonlinearity.

Chen Wang, Yongzheng Wen, Jingbo Sun

    Optics Letters
    |May 14, 2021
    PubMed
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    Researchers developed a new method using metamaterials to broaden the bandwidth of second-harmonic generation (SHG). This artificial optical nonlinearity allows for custom-designed, on-chip nonlinear optical devices with broadband operation.

    Area of Science:

    • Metamaterials and Optics
    • Nonlinear Optics
    • Condensed Matter Physics

    Background:

    • Metamaterials offer unique optical properties through engineered structures.
    • Second-harmonic generation (SHG) is a key nonlinear optical process with applications in frequency conversion.
    • Broadening the bandwidth of SHG is crucial for many photonic applications.

    Purpose of the Study:

    • To present a novel mechanism for broadening the bandwidth of second-harmonic generation (SHG).
    • To utilize metamaterial-based artificial optical nonlinearity for enhanced SHG performance.
    • To enable on-chip custom-designed nonlinear optical devices with broadband operation.

    Main Methods:

    • Designing meta-molecule (MM) structures with varying geometrical sizes.

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  • Leveraging magnetoelectric coupling within MMs to create artificial optical nonlinearity.
  • Employing physical modeling and numerical simulations to validate the approach.

    • Main Results:

    • Successfully demonstrated broadband second-order nonlinearity by combining MMs of different sizes.
    • Achieved effective broadening of the SHG bandwidth through artificial optical nonlinearity.
    • Validated the artificial generation and modulation of broadband second harmonics via simulations.

    Conclusions:

    • A new route for realizing broadband SHG using metamaterial-based artificial nonlinearity is presented.
    • The proposed method allows for on-chip custom-designed nonlinear optical devices.
    • This work paves the way for advanced photonic devices with tailored nonlinear optical responses.