Acoustic Resonances in Solids: Pressure-, Spatial- and Photo-tuning

凝聚态物理项目将开发一种新的激光散射技术，以测量材料的弹性常数，最高可达金刚石砧室中可达到的兆巴压力。该研究基于对因表面波纹效应而产生的驻波共振的检测。 该技术对于不透明材料的研究特别有用，并将应用于地球物理学中重要的关键材料。 提出的实验应该可以深入了解与埋藏界面和嵌入式层状结构相关的变形机制和弹性特性的物理学。 这些系统中声波的频率分布和空间限制将为声波器件应用带来新的机会。 此外，还将研究一种新型光改性玻璃态的不寻常机械性能，该玻璃态在二元硫属化物玻璃中稳定在最佳连接状态。 同样令人感兴趣的是机械稳定性和与原子之间的局部连接相关的明显玻璃形成倾向之间的重要相互作用。 该项目将培训研究生和本科生解决当代固体物理学中的挑战性问题。 他们将获得现代激光光谱技术的宝贵经验。 这种教育将为他们在学术界或工业界的富有成效的职业生涯做好准备。该项目将支持固体声学和机械性能的激光光谱研究。 该研究涉及材料在极端压缩（接近地球内部压力）下的行为。 它将开发一种新方法来探测材料的高压行为，并将产生材料结构特性理论的关键参数。 处理仅限于埋层的高频声波的研究应该为局部激发的物理学提供重要的信息。 波的频率分布和空间限制将带来新的技术机遇，而不受传统表面波设备带宽限制的影响。 拟议的玻璃研究通过创建新的光修改状态来解决其弹性和光学特性的关键方面。 有趣的是这种状态的性质如何与玻璃的形成相关，以及玻璃性质如何取决于原子的特定局部连通性。 加上与玻璃的非晶体性质相关的自由度和灵活性，不寻常的光诱导效应可能会在这些有用的材料中产生具有技术价值的结果。 这项研究将在研究生和本科生的帮助下进行。 他们将通过参与固体物理和激光光谱技术的当代前沿研究获得宝贵的经验。这些经验对于他们的进一步学习，或者在工业界、学术界或政府实验室的就业都有很大的价值。

The condensed matter physics project will develop a new laser light scattering technique to measure the elastic constants of materials up to mega-bar pressures achievable in a diamond anvil cell. The research is based on the detection of standing wave resonances that develop because of surface corrugation effects. The technique is particularly useful for studies of opaque materials and will be applied to key materials important in geophysics. Experiments are proposed that should provide insights into the physics of poorly understood deformation mechanisms and elastic properties associated with buried interfaces and embedded laminar structures. The frequency profile and spatial confinement of acoustic waves confined in these systems will yield new opportunities for acoustic wave device applications. In addition, the unusual mechanical properties of a new, photo-modified, state of glass that is stabilized at optimum connectivity in binary chalcogenide glasses will be investigated. Also of interest is the important interplay between mechanical stability and pronounced glass forming tendencies related to local connectivity between atoms. The project will train graduate and undergraduate students in challenging issues in contemporary solid state physics. They will gain valuable experience with modern laser spectroscopy techniques. This education will prepare them for productive careers in academia or industry.The project will support a laser spectroscopy study of the acoustic and mechanical properties of solids. The research involves the behavior of materials under extreme compression - approaching pressures at the Earth's interior. It will develop a new method to probe high-pressure behavior of materials and will yield critical parameters for theories of material structural properties. The study dealing with high frequency acoustic waves confined to buried layers should provide important information into the physics of localized excitations. The frequency profile and spatial confinement of the waves will yield new technological opportunities that will not suffer from bandwidth limitations of conventional surface wave devices. The proposed study of glasses addresses key aspects of their elastic and optical properties through creation of a new, photo-modified, state. Of interest is how the properties of this state relate to the formation of glasses and how glass properties depend on the specific local connectivity of atoms. Together with the freedom and flexibility associated with the non-crystalline nature of glasses, the unusual light-induced effects may yield results of technological value in these useful materials. This research will be conducted with the aid of graduate and undergraduate students. They will gain valuable experience through their involvement in contemporary forefront research in solid state physics and laser spectroscopy techniques. These experiences will be of great value in their further studies, or employment in industry, academia or government laboratories.