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Enhanced radiative energy tunneling with dielectric optical resonators and its usage in harvesting thermal energy inside a solid

使用介电光学谐振器增强辐射能量隧道及其在固体内部收集热能中的用途

基本信息

批准号：
2117953
负责人：
Sy-Bor Wen
金额：
$ 38.77万
依托单位：
Texas A&M Engineering Experiment Station
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：
2022-10-01 至 2025-09-30
项目状态：
未结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2117953&HistoricalAwards=false
关键词：
Enhanced radiative energy tunneling dielectric

项目摘要

Far-field thermal radiation is a type of broadband energy transfer among surfaces. When the separation distances among surfaces are less than tens to hundreds of nanometers, the radiation spectrum can be confined to a very narrow band, where the radiation intensity can be orders of magnitude higher than the blackbody limit. This microscale phenomenon is called near-field thermal radiation. The high-intensity energy transport in near-field radiation can be valuable in constructing high efficiency, high power density thermal engines for thermal to electric energy conversion such as thermophotovoltaics, thereby reducing the fuel consumption in transportation and electricity generation. However, implementing near-field thermal radiation can be challenging in practical applications because the required tens to hundreds of nanometer separation distance between hot and cold surfaces are difficult to maintain. This study will extend the useful range of near-field thermal radiation to micron-levels by amplifying the non-radiative thermal electric field and the resulting tunneling distance between hot and cold surfaces. The proposed project is built upon the investigator's expertise in near-field energy transport and the design/fabrication of nano-optical resonators that can amplify the thermal electric field with ultra-thin metasurface structures. The project tasks are to first integrate dielectric optical antenna theory with Wiener Chaotic expansion to understand resonance, amplification, and radiative energy tunneling between two lossy solids across a vacuum gap with appropriate high-quality factors dielectric optical resonators (DORs) under different temperatures. This will allow for the determination of the tunneling frequencies, efficiencies, and distances between two solids as functions of DOR designs. Theoretical thermal efficiencies of energy harvest systems using the enhanced long-distance tunneled radiative heat transfer scheme with a consideration of parasitic heat conduction and quantum efficiencies of photovoltaic devices will then be studied as a function of radiation intensities and output voltages. The knowledge gained will be valuable in constructing high-efficiency, high-power density, lightweight thermal engines using currently available engineering techniques, which can have the potential to reduce greenhouse gas emissions and the associated environmental impacts and increase the nation's energy security.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.

远场热辐射是一种表面间的宽带能量传递。当表面之间的分离距离小于几十到几百纳米时，辐射光谱可以被限制在非常窄的频带内，其中辐射强度可以比黑体极限高几个数量级。这种微尺度现象被称为近场热辐射。近场辐射中的高强度能量传输在构建用于热能到电能转换的高效率、高功率密度热机（例如，热光电转换）中可以是有价值的，从而减少运输和发电中的燃料消耗。然而，实现近场热辐射在实际应用中可能具有挑战性，因为难以维持热表面和冷表面之间所需的数十至数百纳米的分离距离。这项研究将扩大近场热辐射的有用范围到微米级的放大非辐射热电场和由此产生的隧道之间的冷热表面的距离。拟议的项目是建立在研究人员的专业知识，近场能量传输和纳米光学谐振器的设计/制造，可以放大热电场与超薄超颖表面结构。该项目的任务是首先将介电光学天线理论与维纳混沌展开相结合，以了解不同温度下具有适当高品质因子的介电光学谐振器（DOR）的两个有损耗固体之间的谐振，放大和辐射能量隧道穿过真空间隙。这将允许确定隧道频率、效率和两个固体之间的距离作为DOR设计的函数。能量收集系统的理论热效率，使用增强的长距离隧道辐射传热计划与寄生热传导和光伏器件的量子效率的考虑，然后将作为辐射强度和输出电压的函数进行研究。所获得的知识将是宝贵的，在建设高效率，高功率密度，轻型热发动机使用目前可用的工程技术，该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的评估，被认为值得支持。影响审查标准。