Highly-efficient radiative thermal rectifiers based on near-field gap variations

Yang, Bei; Dai, Qing

doi:10.1039/d2nr04350e

Cited by 13 publications

(4 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…31,32 Besides, the temperature dependence of materials is always limited, which sets an upper limit for TRF. Recently, a highly efficient radiative thermal rectifier based on near-field gap variations has been proposed, 33 and thermal expansion materials (TEMs) have been used in the thermal rectifier. When the temperature bias is converted, the expansion or contraction of the thermal expansion layer changes the radiation gap of the rectifier, thus achieving a large TRF, which provides a new paradigm for designing thermal rectifiers.…”

Section: ■ Introductionmentioning

confidence: 99%

“…To date, researchers have paired various dissimilar materials on two terminals to increase this asymmetry; these materials include two-dimensional materials, , phase change materials, − and polar dielectrics, , but the mismatched electromagnetic properties of these materials affect spectral matching, thus reducing the radiant heat flux. , Besides, the temperature dependence of materials is always limited, which sets an upper limit for TRF. Recently, a highly efficient radiative thermal rectifier based on near-field gap variations has been proposed, and thermal expansion materials (TEMs) have been used in the thermal rectifier. When the temperature bias is converted, the expansion or contraction of the thermal expansion layer changes the radiation gap of the rectifier, thus achieving a large TRF, which provides a new paradigm for designing thermal rectifiers.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ultrahigh-Efficiency Thermal Rectification via Topological Transition of Photonic Density of States and Near-Field Radiation Gap Variations

Tian,

Li,

Gao

et al. 2024

ACS Photonics

View full text Add to dashboard Cite

Near-field thermal rectifiers are essential for thermal management, thermal logic calculation, and energy conversion. However, current rectifier designs rely primarily on material response characteristics to different temperatures, which compromise spectral matching, reduce heat flux, and limit their rectification effectiveness. To address this significant challenge, we present a near-field thermal rectifier based on a multilayer structure that simultaneously achieves hyperbolic mode conversion and radiation gap modulation within a heat-transfer system. This approach allows us to achieve an ultrahigh thermal rectification factor of approximately 28,000 (at a typical temperature difference of 100 K). Moreover, this scheme demonstrates strong robustness to temperature changes and can produce significant thermal rectification effects, even under minimal temperature differences. The proposed rectification solution is simple and readily implemented, and further improvements can be achieved by designing graphene hybridization or other heterostructures. This study offers novel insights into utilizing structural advantages to design innovative near-field radiative thermal rectifiers and could be applied to advanced thermal management and energy conversion systems.

show abstract

Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ultrahigh-Efficiency Thermal Rectification via Topological Transition of Photonic Density of States and Near-Field Radiation Gap Variations

Tian,

Li,

Gao

et al. 2024

ACS Photonics

View full text Add to dashboard Cite

show abstract

“…[1,2] Photon tunneling through evanescent modes significantly enhances the nearfield radiative heat transfer (NFRHT), enabling it to far exceed the blackbody limit. The advancement of NFRHT has garnered considerable attention because of its potential in applications like thermophotovoltaics, [30][31][32][33][34][35][36] thermal rectification, [37][38][39] solid-state cooling, [40][41][42] and so on.…”

Section: Introductionmentioning

confidence: 99%

Influence of substrate effect on near-field radiative modulator based on biaxial hyperbolic materials

Liu 刘,

Hu 胡

et al. 2024

Chinese Phys. B

View full text Add to dashboard Cite

Relative rotation between the emitter and receiver could effectively modulates the near-field radiative heat transfer (NFRHT) in anisotropic media. Due to the strong in-plane anisotropy, natural hyperbolic materials can be used to construct near-field radiative modulators with excellent modulation effect. However, in practical applications, natural hyperbolic materials need to be deposited on the substrate, and the influence of substrate on modulation effect has not been studied yet. In this work, we investigate the influence of substrate effect on near-field radiative modulator based on α-MoO3. The results show that compared to the situation without a substrate, the presence of both lossless and lossy substrate will reduce the modulation contrast (MC) for different film thicknesses. When the real or imaginary component of the substrate permittivity increases, the mismatch of hyperbolic phonon polaritons (HPPs) weakens, resulting a reduction in MC. By reducing the real and imaginary components of substrate permittivity, the MC can be significantly improved, reaching 4.64 for ε s = 3 at t = 10 nm. This work indicates that choosing substrate with a smaller permittivity helps to achieve better modulation effect, and provides guidance for the application of natural hyperbolic materials in near-field radiative modulator.

show abstract

“…hBN, a polar crystal with low material loss and high thermal stability, is an excellent candidate for high-temperature IR nanophotonics. [31][32][33] The unique feature of hBN antennas lies in that they support a range of hyperbolic PhP (HPhPs) modes when exposed to mid-IR light. These HPhPs propagate with strong field confinement inside the antenna structure.…”

Section: Introductionmentioning

confidence: 99%

Phonon Polaritons: A New Paradigm for Light‐Controllable Heat Sources

Yang

Pan

Dai

2023

Advanced Optical Materials

Self Cite

View full text Add to dashboard Cite

Photothermal applications, such as therapy, imaging, and catalysis, necessitate heat sources capable of generating high temperatures under mid‐infrared (mid‐IR) illumination. However, commonly used metal nanostructures suffer from low efficiency due to their high carrier concentrations, resulting in shallow surface heating and optical range restrictions. To overcome these limitations, this work proposes a novel approach employing materials that support phonon polaritons (PhPs) as a promising paradigm for light‐controllable heat sources. The theoretical demonstration reveals that hexagonal boron nitride (hBN) nanorods can produce up to 46 times more heat compared to plasmonic gold counterparts under resonant monochromatic light. This superior heating capability stems from the unique properties of PhPs, which enable stronger field confinement and deeper penetration within the nanostructure, leading to higher efficiency by circumventing the electrostatic shielding effect associated with plasmonic heating. Furthermore, this work demonstrates that the heating performance of hBN antennas can be optimized by manipulating their size, geometry, and material loss. Notably, the use of isotopically pure hBN can triple the heat power. These findings highlight the tremendous potential of hBN antennas as light‐controllable heat sources, opening up new possibilities for IR photothermal applications by harnessing materials that support PhPs.

show abstract

Highly-efficient radiative thermal rectifiers based on near-field gap variations

Abstract: Near-field radiative thermal rectifiers (NFRTRs) enabling directional heat transport hold great promise for various applications, including thermal logic computing, thermal management, and energy conversion. Current NFRTR designs rely on dissimilar...

Cited by 13 publications

References 54 publications

Ultrahigh-Efficiency Thermal Rectification via Topological Transition of Photonic Density of States and Near-Field Radiation Gap Variations

Ultrahigh-Efficiency Thermal Rectification via Topological Transition of Photonic Density of States and Near-Field Radiation Gap Variations

Influence of substrate effect on near-field radiative modulator based on biaxial hyperbolic materials

Phonon Polaritons: A New Paradigm for Light‐Controllable Heat Sources

Contact Info

Product

Resources

About