Two-color beam improvement of the colloidal particle lens array assisted surface nanostructuring
Two-color beam improvement of the colloidal particle lens array assisted surface nanostructuring
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DOI：
10.1063/1.4919898
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发表时间：
2015-05
影响因子：
4
通讯作者：
A. Afanasiev;V. Bredikhin;A. Pikulin;I. Ilyakov;B. Shishkin;R. Akhmedzhanov;N. Bityurin
中科院分区：
文献类型：
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作者：
A. Afanasiev;V. Bredikhin;A. Pikulin;I. Ilyakov;B. Shishkin;R. Akhmedzhanov;N. Bityurin
我们考虑利用胶体粒子透镜阵列来实现材料表面的激光纳米结构。在这里，放置在表面上的单分子介电微球或纳米球充当近场透镜的阵列，将激光辐射聚焦到众多不同的光点，允许在单个阶段形成许多结构。结果表明，将飞秒光束的一小部分能量转换为二次谐波是提高纳米结构表面密度的有效途径。通过将基频和SH结合起来，人们既受益于前者的功率，又受益于后者的聚焦能力。这种组合提供了一种有效的纳米结构，其球径接近二次谐波的波长。用飞秒钛宝石激光工作在80 0 nm的−2表面密度大于5×10 8 cm的纳米结构阵列被证明是可能的，使用0.45μm球。
We consider laser nanostructuring of the material surface by means of a colloidal particle lens array. Here, the monolayer of dielectric micro- or nanospheres placed on the surface acts as an array of near-field lenses that focus the laser radiation into the multitude of distinct spots, allowing the formation of many structures in a single stage. We show that conversion of a small part of the energy of the femtosecond beam into the second harmonic (SH) is an efficient way to increase the surface density of obtained nanostructures. By combining the fundamental frequency and the SH, one benefits both from the power of the former and from the focusing ability of the latter. This combination provides an efficient nanostructuring with sphere diameter close to the wavelength of the second harmonic. The possibility to create arrays of nanostructures with surface density above 5×108 cm−2 with femtosecond Ti:sapphire laser operating at 800 nm was demonstrated by employing 0.45 μm spheres.