用纤维介电微探针激光辅助金属薄膜的纳米结构

Alexander A. Kuchmizhak , Oleg B. Vitrik , Yuri N. Kulchin
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引用次数: 0

摘要

提出了一种简单的无孔介质微探针,其形式为锥形光纤的一段,用于表面激光纳米改性。该探头使激光光束的表面λ/2定位,如数值和实验证明。利用该探针和532 nm泵浦纳秒激光器,在50 nm Au/Pd薄膜中可控形成最小尺寸为35 nm (~ λ/15)的单通纳米孔。我们还首次报道了利用单纳秒激光脉冲通过光纤介电无孔探针聚焦在光学厚金薄膜上形成微和纳米凸起、射流状微结构和微孔。得到的微结构的形状和尺寸均由脉冲能量和薄膜厚度决定。
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Laser-assisted nanostructuring of metal films by means of a fibre dielectric microprobe

A simple apertureless dielectric microprobe in the form of a section of the tapered optical fibre was proposed for surface laser nanomodification. This probe enables surface λ/2-localisation of laser beam, as demonstrated both numerically and experimentally. The controllable formation of single through nanoholes with the minimum size down to 35 nm (∼λ/15) in the 50-nm Au/Pd film was shown using this probe and a 532-nm pump nanosecond laser. We also report for the first time on the formation of micro- and nanobumps, jet-like microstructures and microholes on optically thick gold films using single nanosecond laser pulses focused through the fibre dielectric apertureless probe. Both the shape and the sizes of the obtained microstructures were demonstrated to be determined by the pulse energy and film thickness.

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