CDS&E: Nanoconfined Heating via Ultrahigh-repetition-rate Lasers for Enhanced Surface Processing

CDS

基本信息

批准号：
1953300
负责人：
Yan Wang
金额：
$ 35万
依托单位：
Board of Regents, NSHE, obo University of Nevada, Reno
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2020
资助国家：
美国
起止时间：
2020-07-01 至 2024-12-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1953300&HistoricalAwards=false
关键词：
CDS&amp Nanoconfined Heating via Ultrahigh

项目摘要

Pulsed laser processing is a manufacturing method that uses ultrafast laser pulses to precisely fabricate three-dimensional objects. Among the tunable parameters in pulsed laser processing, the laser repetition rate (the number of laser pulses per second) has only recently been recognized as essential for controlling the affected depth of laser ablation, sintering, and melting processes. This depth limit determines the resolution and efficiency of pulsed laser technologies for micro-/nano-electronics and aerospace and nuclear applications. This project aims to explore the minimum achievable depth when the laser repetition rate increases to the giga-/terahertz regime. A set of advanced computational tools will be developed and implemented to understand the laser and materials interactions under extreme conditions. Successful completion of this project will enable confined heating of ultrahigh-repetition-rate lasers to the nanoscale, thereby improving the precision and efficiency of ablation, melting, and sintering of nano-layers at material surfaces. The research team will also develop education programs on thermal transport and laser manufacturing at the extremes to impact and inspire broad audiences, from local K-12 students to students at the University of Nevada, Reno. Open-source code developed from the project will be deployed at nanoHUB.org and accessible to both academia and industry. The overarching goals of this project are to predict and control the depth of the heat-affected zone during ultrahigh-repetition-rate laser processing, to model the unique microstructure behaviors of laser-material interactions under extreme conditions, and to develop and apply advanced thermomechanical models to predict the material responses to laser processing. Specifically, the research team will develop, validate, and share advanced computational models for predicting thermal transport behaviors for a broad range of materials under pulsed laser heating at repetition rates up to the terahertz regime. Moreover, the PIs will develop thermomechanical models—synergizing the power of the phase field method, molecular dynamics, and Boltzmann transport equations—for predicting the poorly understood material behaviors and properties during and after ultrahigh-repetition-rate laser processing. The process-structure-property relations for ultrahigh-repetition-rate laser processing will be established through this project. Such knowledge will enable the development of ultra-precise, fast, and efficient laser manufacturing technologies via nano-confined heating. This project is jointly funded by the Thermal Transport Processes program and the Established Program to Stimulate Competitive Research (EPSCoR).This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

脉冲激光处理是一种制造方法，它使用超快激光脉冲精确地制造了三维物体。在脉冲激光处理中的可调参数中，激光重复率（每秒激光脉冲的数量）直到最近才被认为是控制激光消融，烧结和熔化过程的影响深度至关重要。该深度极限决定了脉冲激光技术在微/纳米电子和航空航天和核应用方面的分辨率和效率。该项目旨在探索当激光重复率提高到GIGA-/Terahertz制度时，探索最低可实现的深度。将开发和实施一组先进的计算工具，以了解极端条件下的激光和材料相互作用。该项目的成功完成将使纳米级的超高repetition-Rate-Lasers限制加热，从而提高材料表面上的纳米层的消融，熔化和烧结的精度和效率。研究团队还将开发有关极端热运输和激光制造的教育计划，以影响和激发广泛的受众，从当地的K-12学生到里诺内华达大学的学生。该项目开发的开源代码将在nanohub.org部署，并可供学术界和行业访问。该项目的总体目标是预测和控制超高重复速率激光处理期间热影响区域的深度，以模拟极端条件下激光 - 物质相互作用的独特微观结构行为，并在极端条件下开发和应用高级热力学模型，以预测对激光器处理的材料响应。具体而言，研究团队将开发，验证和共享先进的计算模型，以预测脉冲激光加热的广泛材料的热传输行为，直到Terahertz制度。此外，PI将开发热机械模型 - 使相位场方法的功能，分子动力学和Boltzmann传输方程相结合，以预测超高重复比率激光器处理过程中和之后的材料行为和特性不足。该项目将建立用于超高重复速率激光处理的过程结构 - 培训关系。这些知识将通过纳米限制的加热来开发超精油，快速和高效的激光制造技术。该项目由热运输过程计划和启发竞争性研究的既定计划共同资助。该奖项反映了NSF的法定任务，并使用基金会的知识分子优点和更广泛的影响审查标准，认为通过评估被认为是宝贵的支持。