Galatea Laboratory, STI/IEM, Ecole Polytechnique Fédérale de Lausanne (EPFL), 2002, Neuchâtel, Switzerland.
Department of Materials Science and Engineering, Tokyo Institute of Technology, Tokyo, 152-8552, Japan.
Adv Mater. 2023 May;35(20):e2210446. doi: 10.1002/adma.202210446. Epub 2023 Mar 30.
The formation of elemental trigonal tellurium (t-Te) on tellurite glass surfaces exposed to femtosecond laser pulses is discussed. Specifically, the underlying elemental crystallization phenomenon is investigated by altering laser parameters in common tellurite glass compositions under various ambient conditions. Elemental crystallization of t-Te by a single femtosecond laser pulse is unveiled by high-resolution imaging and analysis. The thermal diffusion model reveals the absence of lattice melting upon a single laser pulse, highlighting the complexity of the phase transformation. The typical cross-section displays three different crystal configurations over its depth, in which the overall thickness increases with each subsequent pulse. The effect of various controlled atmospheres shows the suppressing nature of the elemental crystallization, whereas the substrate temperature shows no significant impact on the nucleation of t-Te nanocrystals. This research gives new insight into the elemental crystallization of glass upon femtosecond laser irradiation and shows the potential to fabricate functional transparent electronic micro/nanodevices.
讨论了飞秒激光脉冲照射下碲酸盐玻璃表面形成元素三角碲（t-Te）的现象。具体而言，通过在不同环境条件下改变常见碲酸盐玻璃成分中的激光参数，研究了基本的元素结晶现象。通过高分辨率成像和分析揭示了单个飞秒激光脉冲实现 t-Te 的元素结晶。热扩散模型表明单个激光脉冲不会导致晶格熔化，突出了相变的复杂性。典型的横截面在其深度上显示出三种不同的晶体结构，其中每个后续脉冲的整体厚度都会增加。各种受控气氛的影响表明元素结晶具有抑制性，而衬底温度对 t-Te 纳米晶的成核没有显著影响。这项研究深入了解了飞秒激光辐照下玻璃的元素结晶，并展示了制造功能透明电子微/纳器件的潜力。
