Zhang Wenbin, Wang Boxiang, Jin Shenghao, Zhou Jiahao, Gong Zhen, Zhao Changying
Institute of Engineering Thermophysics, School of Mechanical Engineering, MOE Key Laboratory for Power Machinery and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China.
2020 X-Lab, State Key Laboratory of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, 200050, China.
Adv Mater. 2024 Sep;36(36):e2405885. doi: 10.1002/adma.202405885. Epub 2024 Jul 31.
Near-field radiative heat transfer (NFRHT) can exceed the blackbody limit by several orders of magnitude owing to the tunneling evanescent waves. Exploiting this near-field enhancement holds significant potential for emerging technologies. It has been suggested that coupled polaritons can give rise to orders of magnitude enhancement of NFRHT. However, a thorough experimental verification of this phenomenon is still missing. Here this work experimentally shows that NFRHT mediated by coupled polaritons in millimeter-size graphene/SiC/SiO composite devices in planar plate configuration can realize about 302.8 ± 35.2-fold enhancement with respect to the blackbody limit at a gap distance of 87 ± 0.8 nm. The radiative thermal conductance and effective gap heat transfer coefficient can reach unprecedented values of 0.136 WK and 5440 WmK. Additionally, a scattering-type scanning near-field optical measurement, in conjunction with full-wave numerical simulations, provides further evidence for the coupled polaritonic characteristics of the devices. Notably, this work experimentally demonstrates dynamic regulation of NFRHT can be achieved by modulating the bias voltage, leading to an ultrahigh dynamic range of ≈4.115. This work ambiguously elucidates the important role of coupled polaritons in NFRHT, paving the way for the manipulation of nanoscale heat transport, energy conversion, and thermal computing via the strong coupling effect.
由于隧穿倏逝波，近场辐射热传递（NFRHT）可以比黑体极限高出几个数量级。利用这种近场增强对新兴技术具有巨大潜力。有人提出耦合极化子可以使NFRHT增强几个数量级。然而，这一现象仍缺乏全面的实验验证。在此，这项工作通过实验表明，在平板结构的毫米尺寸石墨烯/SiC/SiO复合器件中，由耦合极化子介导的NFRHT在87±0.8nm的间隙距离下，相对于黑体极限可实现约302.8±35.2倍的增强。辐射热导率和有效间隙传热系数可达到前所未有的0.136WK和5440WmK值。此外，散射型扫描近场光学测量结合全波数值模拟，为器件的耦合极化子特性提供了进一步的证据。值得注意的是，这项工作通过实验证明，通过调制偏置电压可以实现NFRHT的动态调节，从而实现约4.115的超高动态范围。这项工作明确阐明了耦合极化子在NFRHT中的重要作用，为通过强耦合效应操纵纳米级热传输、能量转换和热计算铺平了道路。
