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arXiv 1801.09259physics.optics
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用Hartmann-Shack波前像差仪测量电场取向金纳米棒的非线性refractive index

Nonlinear refractive index of electric field aligned gold nanorods measured with a Hartmann-Shack wavefront aberrometer

Melissa Maldonado, Leonardo de S. Menezes, Leonardo F. Araujo, Greice K. B. da Costa, Isabel C. S. Carvalho, Jake Fontana, Cid B. de Araujo, Anderson S. L. Gomes

摘要:

动态控制等离子体悬浮液的非线性折射率的能力可以实现创新的非线性传感和信号发送纳米技术。在这里,我们实验确定的有效非线性折射率的金纳米棒悬浮在一个指数匹配油对齐使用电场,展示了一种方法来调制的非线性光学性能的悬浮液。利用哈特曼-夏克波前像差仪在高重复频率飞秒激光准直光束中进行了非线性光学实验。在800 nm处探测悬浮液,与纳米棒的长轴吸收峰重叠。我们发现,金纳米棒悬浮液的有效非线性折射率线性依赖于取向序参量,S,这可以理解的热致非线性响应。我们还表明,非线性响应的幅度可以变化~ 60%。

英文摘要:

The capability to dynamically control the nonlinear refractive index of plasmonic suspensions may enable innovative nonlinear sensing and signaling nanotechnologies. Here, we experimentally determine the effective nonlinear refractive index for gold nanorods suspended in an index matching oil aligned using electric fields, demonstrating an approach to modulate the nonlinear optical properties of the suspension. The nonlinear optical experiments were carried out using a Hartmann-Shack wavefront aberrometer in a collimated beam configuration with a high repetition rate femtosecond laser. The suspensions were probed at 800 nm, overlapping with the long-axis absorption peak of the nanorods. We find that the effective nonlinear refractive index of the gold nanorods suspension depends linearly on the orientational order parameter, S, which can be understood by a thermally induced nonlinear response. We also show the magnitude of the nonlinear response can be varied by ~60%.

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