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Plasmon-enhanced optical nonlinearity in pyramidal silver nanocrystals.

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    Anisotropic silver nanocrystals (NCs) show strong nonlinear optical properties. Ag-610 NCs exhibit superior two-photon and three-photon absorption, making them ideal for advanced optical applications.

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    Area of Science:

    • Materials Science
    • Optical Engineering
    • Nanotechnology

    Background:

    • Silver nanocrystals (NCs) exhibit unique optical properties due to surface plasmon resonance.
    • Anisotropic NCs offer tunable nonlinear optical (NLO) responses compared to spherical ones.

    Purpose of the Study:

    • To investigate and compare the coherent NLO properties of anisotropic silver nanocrystals (Ag-530, Ag-610) with spherical silver nanocrystals (Ag-420).
    • To evaluate the potential of these NCs for high-performance two-photon absorption (2PA) and three-photon absorption (3PA) applications.

    Main Methods:

    • Synthesis of anisotropic and spherical silver NCs with distinct plasmon peaks.
    • Characterization of NLO properties using resonant and off-resonant laser excitation.
    • Measurement of one-photon absorption (1PA) saturation, 2PA, and 3PA coefficients.

    Main Results:

    • Ag-610 NCs demonstrated exceptional transparency under resonant excitation due to significant 1PA saturation.
    • Off-resonant excitation revealed efficient 2PA, 3PA, and saturable absorption (SA) in Ag-610 NCs.
    • Ag-610 NCs showed significantly higher effective nonlinear absorption coefficients for 3PA compared to Ag-420 and Ag-530 NCs.

    Conclusions:

    • Anisotropic Ag-610 NCs possess superior nonlinear absorption figures of merit.
    • These findings highlight Ag-610 NCs as promising materials for advanced 2PA and 3PA applications.