Understanding and Reducing Thermal Noise via Atomistic Simulations

通过原子模拟了解和减少热噪声

• 批准号: 0855292
• 负责人: Hai-Ping Cheng
• 金额: $ 12万
• 依托单位: University of Florida
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2011-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0855292&HistoricalAwards=false
• 关键词: Understanding; Reducing; Thermal; Noise; via

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5). State-of-the-art first-principles quantum mechanical calculations will be used to understand the mechanical properties of dielectric coatings such as Ta2O5. Mechanical properties affect thermal noise in materials that can limit the performance of ultra high-precision interferometers, such those employed in the Laser Interferometer Gravitational-Wave Observatory (LIGO), or the frequency stability of cavity-stabilized laser systems. Advanced LIGO, the next major upgrade of LIGO now under construction, is expected to be limited by thermal noise in the most critical 50-150 Hz band while the performance of several state-of-the-art frequency stabilization systems is limited by thermal noise at frequencies as low as a few Hz. It is of general, societal importance to design dielectric coatings with desired properties. The proposed research activities have applications in many high precision optical measurements far beyond LIGO, for example, time and frequency measurements. The computational approach that characterizes materials will also be useful in a variety other areas such as nano-scale science, material science, and bio-science. The project will also provide rigorous training for graduate students in computational physics.

该奖项是根据2009年《美国复苏与再投资法》（公法111-5）资助的。最先进的第一原理量子机械计算将用于了解介电涂层（例如TA2O5）的机械性能。机械性能会影响材料中的热噪声，从而限制超精度干涉仪的性能，例如激光干涉仪重力波动台（LIGO）中使用的噪声，或型空腔稳定激光系统的频率稳定性。 Advanced Ligo是现在正在建设的Ligo的下一个重大升级，预计将受到最关键的50-150 Hz频段中的热噪声的限制，而几种最先进的频率稳定系统的性能受到低至几Hz的频率的热噪声的限制。设计具有所需特性的介电涂层非常重要，社会重要性。所提出的研究活动在许多高精度的光学测量中的应用远远超出了Ligo，例如时间和频率测量。表征材料的计算方法也将在各种其他领域（例如纳米级科学，材料科学和生物科学）中有用。该项目还将为计算物理学研究生提供严格的培训。