Optical Spectroscopy and Control of Complex Materials

在这个由化学部实验物理化学计划和材料研究部固态化学计划资助的项目中，纳尔逊将进行凝聚态系统的时间分辨光学光谱和相干光学控制的研究。无序和部分无序材料的复杂动力学将在从飞秒到毫秒的时间尺度上进行研究。过冷玻璃形成液体和铁电晶体都表现出复杂的动力学行为，随着温度的变化而急剧变化，将被研究。远红外或太赫兹(THz)频率光谱学的新方法，以及时空飞秒脉冲整形的自动化方法，将被用于产生场级超过2 mV/cm的高强度、聚焦的THz光束。这项研究涉及凝聚态物质的复杂动力学行为，主要是固体、铁电介质和过冷液体。将开发包括太赫兹回波在内的新型高频红外方法。这项工作有可能带来实用的装置。学生和博士后研究助理参与了这项研究。纳尔逊还将实施一项雄心勃勃的推广计划，将物理化学/化学物理方面的研究经验带给中学生

In this project, funded by the Experimental Physical Chemistry Program of the Chemistry Division and the Solid State Chemistry Program of the Division of Materials Research, Nelson will conduct research in time resolved optical spectroscopy and coherent optical control of condensed matter systems. The complex dynamics of disordered and partially disordered materials will be studied over time scales ranging from femtoseconds to milliseconds. Supercooled glass-forming liquids and ferroelectric crystals, both of which exhibit complex dynamical behavior that changes sharply as a function of temperature, will be investigated. Novel methods for far-infrared, or terahertz (THz) frequency spectroscopy, as well as automated methods for spatiotemporal femtosecond pulse shaping will be exploited for generating intense, focused THz beams with field levels exceeding 2 MV/cm. This research is concerned with the complex dynamical behavior of condensed matter, mainly solids, ferroelectric media and supercooled liquids. Novel high frequency infrared methods, including terahertz echoes will be developed. The work has the potential of leading to practical devices. Students and postdoctoral research associates participate in this research. Nelson will also conduct an ambitious outreach program to bring research experiences in physical chemistry/chemical physics to secondary school students