1、Prineha Narang
Predicting and Controlling Correlated Light-Matter Interactions
预测和控制相关的光-物质相互作用
ABSRACT
Quantum systems host spectacular excited-state effects, but many of these phenomena remain challenging to control and, consequently, technologically under-explored. My research, therefore, focuses on how quantum systems behave, particularly away from equilibrium, and how we can harness these effects. By creating predictive approaches to study dynamics, decoherence and photo-induced correlations in molecules and matter, our work could enable technologies that are inherently more powerful than their classical counterparts ranging from quantum information science, to ultra-high efficiency optoelectronic and energy conversion systems.
In this talk, I will present work from my research group on describing, from first principles approaches, the microscopic dynamics, decoherence and optically-excited collective phenomena at finite temperature to quantitatively link predictions with 3D atomic-scale imaging, quantum spectroscopy, and macroscopic behavior. Capturing these dynamics poses unique theoretical and computational challenges. The simultaneous contribution of processes that occur on many time and length-scales have remained elusive for state-of-the-art calculations and model Hamiltonian approaches alike, necessitating the development of new theoretical and computational approaches. I will introduce our work at the intersection of ab initio cavity quantum-electrodynamics and electronic structure methods to treat electrons, photons and phonons on the same quantized footing, accessing new observables in strong light-matter coupling. Building on this, I will show selected examples of our framework in driving quantum chemical systems far out-of-equilibrium to control the coupled electronic and vibrational degrees-of-freedom.
量子系统具有惊人的激发态效应，但其中许多现象仍然难以控制，因此在学界尚未得到充分研究。因此，我的研究重点是量子系统的行为方式，尤其是远离平衡的行为，以及我们如何利用这些效应。通过创建预测性方法来研究分子和物质中的动力学，退相干和光诱导的相关性，我们的工作可以使本质上比经典同类技术强大的技术成为可能，包括但不仅限于量子信息科学和超高效光电和能量转换系统）。
在本次报告中，我将介绍研究小组的工作，这些工作将从基本原理的角度描述有限温度下的微观动力学，退相干和光激发的集体现象，从而将预测与3D原子级成像，量子光谱和宏观分析定量地联系起来行为。捕捉这些动态特性会带来独特的理论和计算挑战。对于最先进的计算和模型哈密顿方法，同时发生在许多时间和长度尺度上的过程的同时贡献仍然难以捉摸，因此有必要开发新的理论和计算方法。我也将介绍我们课题组结合从头计算腔量子电动力学和电子结构方法的工作。该方法在相同的量化基础上处理电子，光子和声子，并以强光-质耦合方式访问新的可观测对象。在此基础上，我将展示一些在驱动量子化学系统失衡以控制耦合的电子和振动自由度时所采用的框架示例。
BIOGRAPHY
Prineha Narang is an Assistant Professor at the John A. Paulson School of Engineering and Applied Sciences at Harvard University. Prior to joining the faculty, Prineha came to Harvard as a Ziff Fellow at HUCE and worked as a Research Scholar at MIT. She received an M.S. and Ph.D. in Applied Physics from the California Institute of Technology. Prineha’s work has been recognized by many awards and special designations, including a National Science Foundation CAREER Award in 2020, being named a Moore Inventor Fellow by the Gordon and Betty Moore Foundation, CIFAR Azrieli Global Scholar by the Canadian Institute for Advanced Research, and a Top Innovator by MIT Tech Review (MIT TR35). Outside of science, she is an avid triathlete and runner.
Prineha Narang是哈佛大学约翰·保尔森工程与应用科学学院的助理教授。在加入该学院之前，Prineha以HUCE的Ziff研究员的身份来到哈佛，并在麻省理工学院担任研究学者。她拥有加州理工学院颁发的应用物理学硕士以及博士学位。Prineha的工作已获得许多奖项和特殊称号的认可，包括2020年美国国家科学基金会职业奖，被戈登和贝蒂·摩尔基金会任命为摩尔发明家学者，加拿大高级研究院CIFAR Azrieli全球学者，以及麻省理工学院技术评论（MIT TR35）的顶级创新者。在学术之外，她还是一名狂热的铁人三项运动员和跑步爱好者。
2、Lauren Zarzar
Structural Coloration from Microstructured Surfaces
基于表面微结构设计的结构色研究
ABSRACT
A variety of physical phenomena create color, such as selective absorption by dyes or pigments, optical dispersion, and structural color by light interference. Nature has exquisitely harnessed structural color, with examples including opals, butterfly wings, and iridescent bird feathers. Man-made iridescent materials are also widely used with applications ranging from color-shifting security inks to cosmetics. In this talk, I will describe a recently discovered, but actually commonplace, mechanism for generating interference colors using microstructured surfaces. Light traveling by different paths of total internal reflection can interfere to generate colors even when the microscale interface has dimensions on the scale of 100 microns. Such interference colors are visible in materials as simple as wetted water droplets and can also be exploited in multiphase droplets, polymer films, and microparticles. The ability to generate tunable interference colors in microscale cavities may have impact in future applications such as sensing, reflective and decorative films, coatings, or anti-counterfeiting.
很多中物理现象都会产生颜色， 比如染料颜料等对光的选择性吸收，光学色散和基于光的干涉的结构色。大自然中包含着多种多样的结构色，比如蛋白石，蝴蝶斑斓的翅膀以及彩虹色的鸟的羽毛。现实生活中，人造结构色材料被广泛的用于变色油墨和化妆品等应用中。在此次报告中，报告人将介绍一种最新发现的但是实际上非常普遍的机制用于产生结构色。基于该机制，即使在100 µm 的微结构界面下，通过不同路径全反射的光也可以产生结构色。如此干涉产生的结构色可以在诸如水滴等简单的材料中可见，并且在多相液滴、聚合物薄膜和微米颗粒中也有广泛的应用。此项在微结构下产生可调节的干涉色的能力在例如传感、反射和装饰膜，涂层及防伪等诸多领域有着广阔的前景。
BIOGRAPHY
Lauren earned a B.A. in chemistry and a B.S. in economics from the University of Pennsylvania, a Ph.D. in chemistry from Harvard University, and completed a postdoc at MIT. Currently, she is an assistant professor at Penn State with appointments in the Department of Chemistry and the Department of Materials Science and Engineering. Research interests include the study of responsive systems and active matter, materials with tunable optical properties, and laser patterning/synthesis methods. Her research has been recognized and funded by a Packard Fellowship for Science and Engineering, a Sloan Research Fellowship, an Army Early Career Award for Scientists and Engineers, a 3M Non-tenured Faculty Award, the Marion Milligan Mason Award for Women in the Chemical Sciences from the American Association for the Advancement of Science, a National Science Foundation CAREER award, and an Air Force Office of Science and Research Young Investigator award. Lauren was selected as one of Chemical & Engineering News “Talented 12” class of 2019 and was a recipient of the Unilever Award from the American Chemical Society Division of Colloid and Surface Chemistry.
Lauren Zarzar教授于宾夕法尼亚州立大学获得化学和经济学双学士学位，于哈佛大学获得博士学位，并在麻省理工学院完成博士后研究。目前，她是宾夕法尼亚州立大学助理教授，于化学系和材料科学于工程系任职。她的研究兴趣包括响应系统，活性材料，光学可调节材料以及激光图形化/激光合成等方面的研究。她的研究得到了帕卡德科学与工程奖学金，斯隆研究奖学金，陆军科学家和工程师早期职业奖，3M非终身教授奖，马里恩·米利根·梅森化学科学女性奖的认可和资助。Lauren Zarzar 教授还被选为2019年“化学与工程新闻”颁发的最杰出的12人，并获得了美国化学学会胶体与表面化学分会Unilever奖。