Hundred-fold enhancement in far-field radiative heat transfer over the blackbody limit

Thompson, Dakotah; Zhu, Linxiao; Mittapally, Rohith; Sadat, Seid; Xing, Zhen; McArdle, Patrick; Qazilbash, M. M.; Reddy, Pramod; Meyhöfer, Edgar

doi:10.1038/s41586-018-0480-9

Cited by 107 publications

(91 citation statements)

References 30 publications

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“…However, the larger size and higher density also led to high κ eff for MgAl 2 O 4 and La 2 Zr 2 O 7 at room temperature (Figure b). However, there have been studies demonstrating higher absorption efficiency deep sub‐wavelength nano‐objects such as anisotropic nanoribbons due to the strong interaction between the surface phonon polariton and MIR in the space . It suggests a new prospect of attaining low κ rad even with high porosity by tuning the hierarchical structure to be highly anisotropic.…”

Section: High‐temperature Thermal Transport In Porous Materialsmentioning

confidence: 99%

Advanced Materials for High‐Temperature Thermal Transport

Shin

Wang

Luo

et al. 2019

Adv Funct Materials

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High temperature processes are widely used in a variety of existing and emerging industrial and aerospace applications. The thermal properties of high‐temperature materials thus play an important role in controlling the thermal energy, as highlighted by successful applications of thermal barrier coating and aerogels. While thermal transport processes at room and low temperature have witnessed tremendous progress in the past two decades, particularly on the fronts of understanding basic heat transfer properties at the micro‐ and nanoscale, the understanding at high temperature is still at the nascent stage, owing to several unique features at high temperature, such as the dominant Umklapp scattering effect that can render a crystalline material amorphous‐like thermal properties, and the important radiation contribution at high temperature. This lack of systematic understanding, coupled with the challenges in maintaining high‐temperature stability in a large number of materials, has limited the development of materials to meet the thermal transport properties pertaining to several current and emerging high‐temperature applications. This Review is aimed at providing an overview of the basic mechanisms governing thermal transport processes at high temperature, to identify their unique features and challenges, and to explore opportunities in material research for high‐temperature thermal materials.

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Section: High‐temperature Thermal Transport In Porous Materialsmentioning

confidence: 99%

Advanced Materials for High‐Temperature Thermal Transport

Shin

Wang

Luo

et al. 2019

Adv Funct Materials

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“…Ideally, the experiment and comparison should be conducted in-situ to fully eliminate any minor variations in experimental conditions. Finally, recently, the radiative heat transfer between an emitting and a receiving plate is found to exceed that calculated from the blackbody reference 15 . However, in our work, the emitted EM radiation propagates ~30 cm (~200,000 λ) in the far-field, while in their work the two plates are separated by 20 μmin the order of two thermal wavelengths.…”

mentioning

confidence: 98%

An In-situ and Direct Confirmation of Super-Planckian Thermal Radiation Emitted From a Metallic Photonic-Crystal at Optical Wavelengths

Lin

Hsieh

John

et al. 2020

Sci Rep

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Planck's law predicts the distribution of radiation energy, color and intensity, emitted from a hot object at thermal equilibrium. The Law also sets the upper limit of radiation intensity, the blackbody limit. Recent experiments reveal that micro-structured tungsten can exhibit significant deviation from the blackbody spectrum. However, whether thermal radiation with weak non-equilibrium pumping can exceed the blackbody limit in the far field remains un-answered experimentally. Here, we compare thermal radiation from a micro-cavity/tungsten photonic crystal (W-PC) and a blackbody, which are both measured from the same sample and also in-situ. We show that thermal radiation can exceed the blackbody limit by >8 times at λ = 1.7 μm resonant wavelength in the far-field. Our observation is consistent with a recent calculation by Wang and John performed for a 2D W-PC filament. This finding is attributed to non-equilibrium excitation of localized surface plasmon resonances coupled to nonlinear oscillators and the propagation of the electromagnetic waves through non-linear Bloch waves of the W-PC structure. This discovery could help create super-intense narrow band thermal light sources and even an infrared emitter with a laser-like input-output characteristic.

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“…This approach assesses the feasibility of the idea to convert the energy of longitudinal phonons into electromagnetic energy of THz photons. The approach seems to be reinforced by recent reports [15][16][17] on an enhancement beyond the blackbody limit of radiative heat transfer in nanometric-scale objects, as well as by our own estimates of the surface power density of spontaneous THz radiation by gold nanoparticles (see Appendix A).…”

Section: Introductionmentioning

confidence: 55%

Prospects of designing gold-nanoparticles-based soft terahertz radiation sources and terahertz-to-infrared converters for concealed object detection technology

Moldosanov

Postnikov

Lelevkin

et al. 2019

Millimetre Wave and Terahertz Sensors and Technology XII

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The two-phonon scheme of generation of terahertz (THz) photons by gold nanobars (GNBs) is considered. It is shown that in GNBs, by choosing their sizes, it is possible to provide conditions for converting the energy of longitudinal phonons with THz frequencies into the energy of THz photons. The prospects of designing GNBs-based soft THz radiation sources (frequencies: 0.14; 0.24; 0.41 and 0.70 THz) with a large flow crosssection (diameter ∼ 40 cm) intended for detection of hidden objects under clothing to ensure security in public places (airports, railway stations, stadiums, etc.) are assessed. The choice of the above frequencies is a compromise between the requirements of low absorption of THz radiation by water vapor in air, good penetration through the fabric of clothing, favoring a sufficient resolution of the imaging system, and an abundance of corresponding longitudinal phonons, capable of exciting Fermi electrons in GNBs. Estimates of the characteristics of the terahertz-to-infrared converter based on gold nanospheres (GNSs), which could work in tandem with these sources of THz radiation -as a means of visualization of hidden objects -are also given.

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Hundred-fold enhancement in far-field radiative heat transfer over the blackbody limit

Cited by 107 publications

References 30 publications

Advanced Materials for High‐Temperature Thermal Transport

Advanced Materials for High‐Temperature Thermal Transport

An In-situ and Direct Confirmation of Super-Planckian Thermal Radiation Emitted From a Metallic Photonic-Crystal at Optical Wavelengths

Prospects of designing gold-nanoparticles-based soft terahertz radiation sources and terahertz-to-infrared converters for concealed object detection technology

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