NER: Femtosecond-Laser-Induced Self-Assembly of Nanograting on Nanowires: An Enabling Technique for Nanowire-Based Active Nanophotonics

NER：纳米线上纳米光栅的飞秒激光诱导自组装：基于纳米线的有源纳米光子学的一种使能技术

• 批准号: 0708555
• 负责人: Tsing-Hua Her
• 金额: $ 10.55万
• 依托单位: University of North Carolina at Charlotte
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-06-15 至 2009-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0708555&HistoricalAwards=false
• 关键词: NER; Femtosecond; Laser; Induced; Self

The objectives of this research are to pattern one-dimensional (1D) periodic nanostructures directly on free-standing nanowires (NWs), demonstrate rudimentary control of the grating periods, and investigate their suitability as on-wire optical grating. This technique is based on our recently discovered laser-driven self-assembly process: by gently focusing a near-UV femtosecond laser beam onto substrates in an atmosphere containing tungsten hexacarbonyl, 1D array of tungsten nanostructure forms spontaneously on almost any materials. Tungsten nanograting (TNG) with excellent long-range order can be obtained by scanning the substrates across the laser beam.The Intellectual Merits of this research lie in the fact that our technique is potentially a single-step, single-beam, room-temperature, and dry process to pattern gratings directly on free-standing NWs. On-wire nanograting is expected to become a fundamental building block for NW-based nanophotonics. However, NWs are increasingly sensitive to the chemical contamination in conventional lithography due to their small dimensions. Our method, on the other hand, involves only single step and therefore could preserve their chemical and physical integrity. Broader Impacts: TNG as on-wire optical grating could enable a host of new applications in NW-based active nanophotonics such as lasers, chemical and mechanical sensors. Graduate and undergraduate students involved in this project will have opportunity to carry out cutting-edge research in femtosecond laser nanofabrication. Besides, we will offer high-school students summer research opportunity to participate in this project under supervision of graduate students in our laboratory and to expose them to the emerging field of nanoscience and technology.

本研究的目的是图案一维（1D）的周期性纳米结构直接在独立的纳米线（NW），演示基本控制的光栅周期，并调查其适用性在线光栅。这项技术是基于我们最近发现的激光驱动的自组装过程：通过在含有六羰基钨的气氛中将近紫外飞秒激光束轻轻聚焦到衬底上，几乎可以在任何材料上自发形成一维钨纳米结构阵列。 通过激光束扫描衬底可以获得具有良好长程有序性的钨纳米光栅（TNG）。本研究的智力价值在于，我们的技术是一个潜在的单步，单光束，室温和干燥的过程，直接在独立的纳米线上图案化光栅。 在线纳米光栅有望成为基于NW的纳米光子学的基本构建块。然而，纳米线由于其小尺寸而对传统光刻中的化学污染越来越敏感。 另一方面，我们的方法只涉及单一步骤，因此可以保持其化学和物理完整性。 更广泛的影响：TNG作为在线光栅可以在基于NW的有源纳米光子学中实现许多新的应用，例如激光器，化学和机械传感器。参与该项目的研究生和本科生将有机会进行飞秒激光纳米加工的前沿研究。 此外，我们将提供高中生暑期研究机会，在我们实验室研究生的监督下参与该项目，并使他们接触纳米科学和技术的新兴领域。