Laser Matter Interaction and Warm Dense Matter Science

激光物质相互作用和热稠密物质科学

• 批准号: RGPIN-2019-04663
• 负责人: Tsui, Ying
• 金额: $ 2.48万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=752295
• 关键词: Laser; Matter; Interaction; Warm; Dense

My research program focuses in the fundamental understanding of laser matter interaction physics and several of its applications. My current focus is on the Warm Dense Matter regime. Warm Dense Matter (WDM) is a state of matter defined by its comparable thermal and Fermi energy, and a density such that the Coulomb potential energy between ions exceeds their thermal kinetic energy. This is a transition regime lying between the condensed matter and plasma phases. The WDM science, an area in material science under extreme conditions, is of fundamental significance because it provides a linkage between condensed matter and plasma physics. The WDM theories are not well developed and they present great challenge for theorists because WDM is too hot for condensed matter theories and too dense for plasma theories. The study of materials under extreme conditions has generated enormous scientific interest and was identified by the US National Academy of Sciences as a priority research area for this century. A better understanding of the quantitative details of WDM is important for laser materials processing, design of materials for withstanding extreme conditions and Inertial Fusion Energy. We have developed an experimental platform which can create a single state transient WDM lasts for several picosecond. We have studies its properties in details experimentally by probing it with ultrafast probes including THz, optical, xrays, and electrons etc. Our optical probing studies of AC conductivity of warm dense gold led to insights in its electron heat capacity, electron ion structure interaction, and DC conductivity. Our ultrafast electron diffraction measurement led to a better understanding of ultrafast melting of gold and led to the first observation of the transition of heterogeneous melting to homogeneous melting. We have developed a single shot THz probing technique which will measure the DC conductivity of WDM directly.  We have also developed a ring resonator technique to study laser induced damage processes in silicon and obtained insights in the incubation processes. We plan to extend the technique to other semiconductor materials. We also plan to study the fundamental physical processes in laser light scattering of complex materials in support of our applied research in solid content analyzer for tailing management and label free physical cytometry for clinical applications.  In summary the main goals for the next 5 years of my research program are to further the fundamental understanding of Warm Dense Matter and laser induced damage mechanisms to make impacts in laser fusion, fusion reactor materials design and laser materials processing. We also like to obtain a better fundamental understanding of the physics of laser light scattering of complex materials in support of our research in several applications based on the laser light scattering technique.

我的研究计划着重于对激光物质相互作用物理及其几种应用的基本理解。我目前的重点是温暖的物质制度。温暖的物质（WDM）是由其可比的热和费米能量定义的物质状态，密度使离子之间的库仑势能超过了其热动能。这是位于冷凝物和血浆阶段之间的过渡状态。 WDM科学是极端条件下物质科学领域的领域，具有基本意义，因为它在凝结物质和血浆物理学之间提供了联系。 WDM理论的发展效果不佳，它们对理论家提出了巨大的挑战，因为WDM对于凝结的物质理论来说太热了，对于血浆理论来说太密集了。对极端条件下材料的研究引起了巨大的科学兴趣，并被美国国家科学院确定为本世纪的优先研究领域。更好地理解WDM的定量细节对于激光材料处理，材料的设计很重要，以承受极端条件和惯性融合能。我们已经开发了一个实验平台，该平台可以创建一个单个状态瞬态WDM持续几个Picsecond。我们通过使用超快速问题进行探测，包括THZ，光学，XRAY和电子设备等实验中的研究特性。我们对热量金的AC电导率的光学探测研究导致了其电子热容量，电子离子结构相互作用和DC电导率的见解。我们的超快电子衍射测量结果使人们对金的超快融化有了更好的了解，并首先观察到异质融化为均匀熔融的过渡。我们已经开发了一种单射击THZ探测技术，该技术将直接测量WDM的直流电导率。我们还开发了一种环谐振技术来研究硅中激光诱导的损伤过程，并在孵育过程中获得了见解。我们计划将技术扩展到其他半导体材料。我们还计划研究复杂材料的激光光散射中的基本物理过程，以支持我们在固体内容分析仪中的应用研究，用于尾部管理和标签无物理细胞仪，用于临床应用。总而言之，我的研究计划接下来的5年的主要目标是进一步了解温暖的密集物质和激光引起的损伤机制，以在激光融合，融合反应堆材料设计和激光材料处理中产生影响。我们还希望获得对复杂材料激光光散射的物理学的更好的基本了解，以支持基于激光光散射技术的多种应用中的研究。