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Laser Induced Backward Transfer of ultra-thin metal structures

机译：激光诱导的超薄金属结构的向后转移

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摘要

Ultra-thin, flexible and stretchable interfaces comprising thin metal films and polymers are attracting increasing interest for applications in sensors and optoelectronics. The transfer of ultra-thin gold films for the digital fabrication of such interfaces was investigated in this study using the Laser-Induced Backward Transfer (LIBT) technique. In particular, the transfer of thin and ultra-thin gold films (60, 10 and 5 nm thick) on Polydimethylosiloxane substrate has been achieved using ps pulses and low laser fluences for controllable material transfer. As the size of the nanograins comprising the Au films decreases, their melting point also decreases, enabling the transfer of intact disk-shaped Au nanostructures at low laser fluence values, with form factors and thickness equal to the pristine films. Moreover, the contribution of the substrate has been clarified: the two substrates (silicon, glass) which were used in this work, have significantly different reflectivity to the selected laser wavelength (532 nm), which can considerably influence the thickness and the quality of the transferred disk. The results presented in this work clearly demonstrate the compatibility of LIBT with ultra-thin metal film/ polymer interfaces and highlight the potential application of this digital process for a variety of optoelectronic applications.
机译：包括金属薄膜和聚合物在内的超薄，柔性和可拉伸界面在传感器和光电子领域的应用吸引了越来越多的兴趣。本研究使用激光诱导向后转移（LIBT）技术研究了用于数字化制造此类界面的超薄金膜的转移。尤其是，已经使用ps脉冲和低激光通量实现了可控的材料转移，从而在聚二甲基硅氧烷基体上转移了薄膜和超薄金膜（厚度分别为60、10和5 nm）。随着包含Au膜的纳米颗粒的尺寸减小，它们的熔点也降低，使得能够在低激光通量值下传递完整的盘状Au纳米结构，其形状因子和厚度等于原始膜。此外，基板的作用已得到澄清：在此工作中使用的两个基板（硅，玻璃）对选定的激光波长（532 nm）具有明显不同的反射率，这会极大地影响其厚度和质量。转移的磁盘。这项工作中提出的结果清楚地证明了LIBT与超薄金属膜/聚合物界面的兼容性，并突出了此数字工艺在各种光电应用中的潜在应用。

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