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年美国复苏和再投资法案（公法111-5）资助的。国家的最先进的第一性原理量子力学计算将被用来理解的介电涂层，如Ta 2 O 5的机械性能。机械性能会影响材料中的热噪声，这可能会限制超高精度干涉仪的性能，例如激光干涉仪引力波天文台（LIGO）中使用的干涉仪，或者腔稳定激光系统的频率稳定性。先进的LIGO是LIGO的下一个主要升级，目前正在建设中，预计将受到最关键的50-150 Hz频段的热噪声的限制，而几个最先进的频率稳定系统的性能受到低至几Hz频率的热噪声的限制。设计具有所需性能的介电涂层具有普遍的社会重要性。所提出的研究活动在许多高精度的光学测量中有着远远超出LIGO的应用，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，如纳米科学，材料科学和生物科学中有用。该项目还将为计算物理学的研究生提供严格的培训。