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In this work, the creation of ordered nanostructure arrays of metals (Ag, Au, Al, and Pd) and characterization of their nonlinear optical properties are described. Large scale ordered metal nanostructure arrays were created by the excimer laser patterning of a polymer surface and subsequent coating with Ag, Au, Al, and Pd. The successful creation of accepted structures was confirmed by the conductive AFM and FIB-SEM techniques. The open-aperture Z-scan technique with femtosecond laser pulses was performed to determine the two-photon absorption (2PA) coefficient of the prepared metal nanostructure arrays. It was found that the strong 2PA appears under the illumination at the wavelength of 800 nm with the polarization direction perpendicular to the long scale metal nano-wires whereas no 2PA was observed when irradiated with laser beam polarized parallel to the metal nano-wires. This reveals that the observed high 2PA activity is a plasmonic-based property due to the confinement effect. An extensive comparison with available literature data shows that the present structures exhibit markedly higher 2PA activity. Obtained results confirmed that the examined approach could be used for the preparation of plasmon-active nanostructures for many applications for a wide range of optical components and devices.

واژه‌های کلیدی: Two-photon absorption، Z-scan، Plasmon، nanostructure

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