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Au/TiO_2/SiO_2 sandwich multilayer composite films with large nonlinear optical susceptibility

机译：非线性光学敏感性大的Au / TiO_2 / SiO_2夹心多层复合膜

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Au/TiO_2/SiO_2 sandwich composite multilayer films were deposited by alternating multitarget magnetron sputtering technique. Annealing process was performed for as-growth. Au particles appeared between the layers and grew with the increasing of the annealing temperature. The surface plasmon resonance of the annealed films is around 570-590 nm. The third-order nonlinear susceptibility was measured with the backward degenerate four wave mixing (DFWM) scheme at a 532 nm wavelength. The calculated values of χ~((3)) at 532nm of the composite films are larger than 1.02 x 10~(-6) esu. We assume the multilayer sandwich topology of the Au/TiO_2/SiO_2 composite films has greatly enhanced the local field factor f and caused a larger χ~((3)) which is even not measured at the wavelength near the surface plasmon resonance of the composite materials.
机译：采用交替多靶磁控溅射技术沉积了Au / TiO_2 / SiO_2夹心复合多层膜。进行退火处理以保持生长。金颗粒出现在层之间并且随着退火温度的升高而生长。退火膜的表面等离子体共振约为570-590nm。使用后退简并四波混频（DFWM）方案在532 nm波长下测量了三阶非线性磁化率。复合膜在532nm处的χ〜（（3））的计算值大于1.02 x 10〜（-6）esu。我们假设Au / TiO_2 / SiO_2复合薄膜的多层夹心拓扑结构极大地提高了局部场因子f并导致更大的χ〜（（3）），甚至在复合材料的表面等离振子共振附近的波长处也无法测量到材料。

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