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Nonlinear optical properties of periodic gold nanoparticle arrays

机译:周期性金纳米粒子阵列的非线性光学性质

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Periodic Au nanoparticle arrays were fabricated on silica substrates using nanosphere lithography. The identical single-layer masks were prepared by self-assembly of polystyrene nanospheres with radius R = 350 nm. The structural characterization of nanosphere masks and periodic particle arrays was investigated by atomic force microscopy. The nonlinear optical properties of the Au nanoparticle arrays were determined using a single beam z-scan method at a wavelength of 532 nm with laser duration of 55 ps. The results show that periodic Au nanoparticle arrays exhibit a fast third-order nonlinear optical response with the nonlinear refractive index and nonlinear absorption coefficient being n_2 = 6.09 x 10~(-6) cm~2/kW and β = -1.87 x 10~(-6) m/W, respectively.
机译:周期性金纳米颗粒阵列是使用纳米球光刻技术在二氧化硅衬底上制备的。通过自组装半径为R = 350 nm的聚苯乙烯纳米球制备相同的单层掩模。通过原子力显微镜研究了纳米球掩模和周期性粒子阵列的结构表征。使用单束z-扫描法在波长为532 nm,激光持续时间为55 ps的情况下确定Au纳米颗粒阵列的非线性光学性质。结果表明,周期性金纳米粒子阵列表现出快速的三阶非线性光学响应,其非线性折射率和非线性吸收系数为n_2 = 6.09 x 10〜(-6)cm〜2 / kW和β= -1.87 x 10〜 (-6)m / W。

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