Tunable Super-Planckian Near-field Radiative Heat Transfer with Thermochromic Metamaterials

使用热致变色超材料的可调谐超普朗克近场辐射传热

• 批准号: 2212342
• 负责人: Liping Wang
• 金额: $ 35.73万
• 依托单位: Arizona State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-07-01 至 2025-06-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2212342&HistoricalAwards=false
• 关键词: Tunable; Super; Planckian; Near; field

Materials at finite temperature above zero Kelvin can emit propagating electromagnetic waves over long distances related to conventional thermal radiation with heat flux limited by blackbodies, as well as decaying waves in close proximity where radiative heat flux could exceed the blackbody limit by orders of magnitude when the distance is much smaller than the characteristic thermal wavelength. This project studies tunable near-field radiative thermal transport with thermochromic materials whose color changes with temperature. The project could impact many potential energy applications including thermal management of microelectronics and energy conversion in solid-state thermopower generation. It will also pave the way to radiation-based near-field devices for active heat control, thermal circuits and thermal computers. The research outcomes will be disseminated through journal publications, conference presentations and course teaching. The PI will train researchers and leaders for the next generation of work force, emphasizing on broader participation of underrepresented groups. Graduate students will learn the fundamentals and skills of multiple disciplines. The Arizona State Fulton Undergraduate Research Initiative program offers a great opportunity for undergraduate students to participate in the research activities in the PI’s lab. The PI will engage local K-12 students and reach out to local public and society through various programs at ASU.This research project aims to advance the fundamental understanding in tunable near-field radiative thermal transport with thermochromic metamaterials across nanometric vacuum gaps based on different physical mechanisms with super-Planckian heat flux exceeding the blackbody limit. Vanadium dioxide as one unique thermochromic material could experience insulator-to-metal phase transition when its temperature increases beyond 68°C. Theoretical calculations based on fluctuational electrodynamics incorporated with thin-film uniaxial wave optics as well as numerical modeling based on rigorous coupled-wave analysis will be implemented to predict the spectral and total radiative heat flux with different thermochromic nanostructures. Advanced nanofabrication methods including thin-film deposition, deep-UV lithography and electron-beam lithography will be used to fabricate the designed thermochromic nanostructures, while unique techniques such as temperature-dependent infrared spectroscopy will be employed to characterize the radiative thermal properties of fabricated samples. Novel near-field thermal metrology that could achieve down to 100-nm vacuum gaps will be utilized for the experimental study of near-field radiative heat transfer to understand how different physical mechanisms enable the tunable heat flux upon phase transition of different thermochromic nanostructures. Potential applications such as near-field radiative thermal rectification and switching will be experimentally demonstrated.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

材料在零开尔文以上的有限温度下可以长距离发射与传统热辐射相关的电磁波，其热通量受黑体限制，并且在附近发射衰变波，其中辐射热通量可能超过黑体极限几个数量级。该项目研究了热致变色材料的可调谐近场辐射热传输，该材料的颜色随温度变化，可能会影响许多潜在的能源应用，包括微电子的热管理。它还将为用于主动热控制、热电路和热计算机的辐射近场设备铺平道路。研究成果将通过期刊出版物、会议演示和课程教学进行传播。 PI 将为下一代劳动力培训研究人员和领导者，强调代表性不足的群体的更广泛参与。亚利桑那州立大学富尔顿本科生研究计划为本科生提供了绝佳的机会。项目负责人将吸引当地 K-12 学生参与，并通过亚利桑那州立大学的各种项目接触当地公众和社会。该研究项目旨在增进对可调谐近场辐射的基本了解。基于不同物理机制的热致变色超材料跨纳米真空间隙的热传输，超普朗克热通量超过黑体极限，二氧化钒作为一种独特的热致变色材料，在其时可以经历绝缘体到金属的相变。温度升高超过 68°C。基于波动电动力学与薄膜单轴波光学相结合的理论计算以及基于严格耦合波分析的数值建模将被实施，以预测不同热致变色纳米结构的光谱和总辐射热通量。先进的纳米制造方法，包括薄膜沉积、深紫外光刻和电子束光刻，将用于制造设计的热致变色纳米结构，同时独特的技术，如温度依赖性红外光谱将用于表征制造样品的辐射热特性，可实现低至 100 纳米真空间隙的新型近场热计量将用于近场辐射传热的实验研究，以了解不同的物理现象。机制使不同热致变色纳米结构的相变时的热通量可调。将通过实验证明近场辐射热整流和开关等潜在应用。该奖项反映了 NSF 的法定使命和使命。通过使用基金会的智力优点和更广泛的影响审查标准进行评估，该项目被认为值得支持。