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: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=685288
• 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.***********

我的研究计划集中在对激光物质相互作用物理及其几个应用的基本理解上。我目前的关注点是热致密物质体系。热致密物质(WDM)是由其可比较的热能和费米能量定义的一种物质状态，以及使离子之间的库仑势能超过其热动能的密度。这是一个介于凝聚态和等离子体相之间的过渡区。WDM科学是极端条件下材料科学的一个领域，它具有基础性的意义，因为它提供了凝聚态物质和等离子体物理之间的联系。波分复用理论还不成熟，对理论工作者提出了很大的挑战，因为波分复用对凝聚态理论来说太热，对等离子体理论来说太密集。极端条件下的材料研究已经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。更好地理解波分复用器的定量细节对于激光材料加工、耐极端条件的材料设计和惯性聚变能量具有重要意义。我们开发了一个实验平台，可以产生持续几皮秒的单态瞬时波分复用器。我们用太赫兹、光学、X射线和电子等超快探头对其性质进行了详细的实验研究。我们对温致密金的交流电导进行了光学探测研究，得到了它的电子热容、电子离子结构相互作用和直流电导等方面的见解。我们的超快电子衍射测量使我们对金的超快熔化有了更好的理解，并首次观察到了非均相熔化向均相熔化的转变。我们研制了一种单次太赫兹探测技术，可以直接测量波分复用器的直流电导率。*我们还开发了一种环形谐振器技术来研究激光在硅中诱导的损伤过程，并在孵化过程中获得了见解。我们计划将这项技术扩展到其他半导体材料。我们还计划研究复合材料激光光散射的基本物理过程，以支持我们在尾矿管理的固体含量分析仪和临床应用的无标记物理细胞术方面的应用研究。*总而言之，我未来5年研究计划的主要目标是加深对热致密物质和激光损伤机制的基本了解，以便对激光聚变、聚变反应堆材料设计和激光材料加工产生影响。我们还希望对复杂材料的激光光散射物理有一个更好的基本了解，以支持我们在基于激光光散射技术的几个应用中的研究。