Achieving Cryogenic Temperature in Laser Cooling Using Ion-Doped Nanopowders

使用离子掺杂纳米粉末实现激光冷却的低温

• 批准号: 0553651
• 负责人: Massoud Kaviany
• 金额: $ 31.96万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-09-01 至 2012-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0553651&HistoricalAwards=false
• 关键词: Achieving; Cryogenic; Temperature; Laser; Cooling

ABSTRACTNational Science FoundationProposal Number CTS-0553651Principal Investigator Kaviany, MassoudAffiliation University of MichiganProposal Title Achieving Cryogenic Temperature in Laser Cooling Using Ion-Doped NanopowdersLaser cooling of solid is achieved as the medium emits light at a shorter wavelength than that it absorbs, with the excess energy provided by the annihilation of lattice phonons. This technique has the potential to develop an all solid-state cryocooler for a variety of applications such as sensor cooling. To date, solids have been cooled from room temperature to 208 K (temperature difference T = 92K). We propose to enhance the cooling performance using nanopowders, to T = 170 K. Absorption is increased by (a) increasing the population of participating electrons through dopant concentration optimization, (b) increasing the number of photons in the interacting volume by photon localization in nanopowders, and (c) increasing the number of participating phonons by phonon density of states optimization using nanoparticle size effect. This enhanced laser cooling performance will be demonstrated by a combined theoretical, computational and experimental investigation. To our knowledge, this will be the first attempt of laser cooling in nanostructured solids, and the first time to bring laser cooling performance to cryogenic temperature range. With respect to Broader Impacts, the emergence of nanotechnology has increased the science content of the engineering research and education. This proposed project is part of the PI's continuous and systematic effort to include more physical fundamentals into an integrated and current academic research-education program in heat transfer.

国家科学基金会提案号CTS-0553651主要研究员卡维尼，马萨诸塞州大学附属机构提案标题实现低温激光冷却使用离子掺杂纳米粉末固体的激光冷却是实现作为介质发射的光在一个较短的波长比它吸收，与晶格声子湮灭提供的多余的能量。这种技术有可能开发一个全固态制冷机的各种应用，如传感器冷却。到目前为止，固体已经从室温冷却到208 K（温差T = 92 K）。我们建议使用纳米粉末来提高冷却性能，T = 170 K。通过（a）通过掺杂剂浓度优化增加参与电子的数量，（B）通过纳米粉末中的光子局域化增加相互作用体积中的光子数量，以及（c）通过使用纳米颗粒尺寸效应的声子态密度优化增加参与声子的数量，来增加吸收。这种增强的激光冷却性能将通过理论、计算和实验相结合的研究来证明。 据我们所知，这将是纳米结构固体中激光冷却的第一次尝试，也是第一次将激光冷却性能带到低温温度范围。 关于更广泛的影响，纳米技术的出现增加了工程研究和教育的科学内容。该拟议项目是PI持续、系统努力的一部分，旨在将更多物理基础知识纳入热传递领域综合且当前的学术研究教育计划中。