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首页> 外文期刊>Physical review >Convection roll-driven generation of supra-wavelength periodic surface structures on dielectrics upon irradiation with femtosecond pulsed lasers
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Convection roll-driven generation of supra-wavelength periodic surface structures on dielectrics upon irradiation with femtosecond pulsed lasers

机译：飞秒脉冲激光辐照在电介质上的对流滚动驱动产生超波长周期性表面结构

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摘要

The significance of the magnitude of the Prandtl number of a fluid in the propagation direction of induced convection rolls is elucidated. Specifically, we report on the physical mechanism to account for the formation and orientation of previously unexplored supra-wavelength periodic surface structures in dielectrics, following melting and subsequent capillary effects induced upon irradiation with ultrashort laser pulses. Counterintuitively, it is found that such structures exhibit periodicities, which are markedly, even multiple times, higher than the laser excitation wavelength. It turns out that the extent to which the hydrothermal waves relax depends upon the laser beam energy, produced electron densities upon excitation with femtosecond pulsed lasers, the magnitude of the induced initial local roll disturbances, and the magnitude of the Prandtl number with direct consequences on the orientation and size of the induced structures. It is envisaged that this elucidation may be useful for the interpretation of similar, albeit large-scale periodic or quasiperiodic structures formed in other natural systems due to thermal gradients, while it can also be of great importance for potential applications in biomimetics.
机译：阐明了在对流辊的传播方向上流体的普朗特数的大小的重要性。具体而言，我们报告了物理机制，以解释电介质中先前未探索的超波长周期性表面结构的形成和取向，随后熔化以及随后的超短激光脉冲辐照引起的毛细管效应。违反直觉地发现，这种结构表现出周期性，其明显甚至高于激光激发波长多次。事实证明，水热波的松弛程度取决于激光束能量，飞秒脉冲激光激发后产生的电子密度，所引起的初始局部侧倾扰动的大小以及对温度有直接影响的普朗特数的大小。诱导结构的方向和大小。可以设想，这种阐明对于解释由于热梯度而在其他自然系统中形成的类似的大规模周期性或准周期性结构可能是有用的，同时对于仿生中的潜在应用也可能非常重要。

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  • 来源
    《Physical review》 |2016年第8期|081305.1-081305.5|共5页
  • 作者

    George D. Tsibidis; Evangelos Skoulas; Antonis Papadopoulos; Emmanuel Stratakis;

  • 作者单位

    Institute of Electronic Structure and Laser (IESL), Foundation for Research and Technology (FORTH), N. Plastira 100, Vassilika Vouton, 70013 Heraklion, Crete, Greece;

    Institute of Electronic Structure and Laser (IESL), Foundation for Research and Technology (FORTH), N. Plastira 100, Vassilika Vouton, 70013 Heraklion, Crete, Greece,VEIC, Department of Ophthalmology, School of Medicine, University of Crete, 71003 Heraklion, Greece;

    Institute of Electronic Structure and Laser (IESL), Foundation for Research and Technology (FORTH), N. Plastira 100, Vassilika Vouton, 70013 Heraklion, Crete, Greece,Materials Science and Technology Department, University of Crete, 71003 Heraklion, Greece;

    Institute of Electronic Structure and Laser (IESL), Foundation for Research and Technology (FORTH), N. Plastira 100, Vassilika Vouton, 70013 Heraklion, Crete, Greece,Materials Science and Technology Department, University of Crete, 71003 Heraklion, Greece;

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