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Field localization and enhanced Second-Harmonic Generation in silicon-based microcavities.

E Descrovi, C Ricciardi, F Giorgis

    Optics Express
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    PubMed
    Summary

    Amorphous silicon nitride microcavities demonstrate surface Second Harmonic Generation (SHG). Structure geometry significantly impacts SHG yield, with differences exceeding tenfold at resonance, explained by electric field distribution models.

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    Area of Science:

    • Materials Science
    • Optics
    • Nonlinear Optics

    Background:

    • Amorphous silicon nitride (a-Si(1-x)N(x):H) is a key material for optical microcavities.
    • Second Harmonic Generation (SHG) is a crucial nonlinear optical process for frequency conversion.

    Purpose of the Study:

    • To investigate the influence of microcavity geometry on surface Second Harmonic Generation (SHG) yield.
    • To analyze the spatial distribution of electric fields within microcavities affecting SHG.

    Main Methods:

    • Fabrication of amorphous silicon nitride Fabry-Pérot microcavities.
    • Experimental measurement of SHG intensity for different microcavity designs.
    • Theoretical modeling of electric field distribution and nonlinear optical effects.

    Main Results:

    • Observed significant variations (over an order of magnitude) in SHG intensity based on microcavity geometry.
    • Demonstrated that SHG yield is strongly dependent on the fundamental beam's resonance frequency.
    • Validated a theoretical model accounting for spatial field distribution and surface-limited nonlinearity.

    Conclusions:

    • Microcavity design plays a critical role in optimizing surface SHG.
    • Understanding electric field distribution is essential for predicting and enhancing nonlinear optical responses.
    • Surface contributions are dominant for second-order nonlinearity in these a-Si(1-x)N(x):H microcavities.