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  • Second harmonic generation in AB-type ▫$LaTiO_3/SrTiO_3$▫ superlattices
    Zhao, Hui, fizičarka ...
    We report the generation and control of second harmonic generation (SHG) from a series of LaTiO3/SrTiO3 superlattices. We demonstrate that the nonlinear optical susceptibility χ(2) and the SHG ... pattern can be tuned by tailoring the number of superlattice interfaces. Significantly, unlike the conventional ABC-type nanostructures, our AB-type nanostructures can also produce SHG signals. The χ(2) value (24.3 pm/V) is even one to two orders of magnitude greater than the conventional ones. Hence, we demonstrate that SHG is a local microscopic process—it does not rely on macroscopic broken inversion symmetry. Moreover, we show that temperature dependence or structural phase transition can further enhance the SHG intensity. Our results introduce a scheme for SHG, extending the generation and control of SHG in nano-photonics to nearly all the accessible centrosymmetric materials.
    Vir: Nano energy [Elektronski vir]. - ISSN 2211-3282 (Vol. 82, April 2021, 105752, str. 1-7)
    Vrsta gradiva - e-članek ; neleposlovje za odrasle
    Leto - 2021
    Jezik - angleški
    COBISS.SI-ID - 179590147

    Povezava(-e):

    https://www.sciencedirect.com/science/article/pii/S2211285521000112
    DOI

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