Realization of an efficient radiative cooling emitter with double layer inorganic SiO2 and TiO2 metamaterial

Yin, Huaiyuan; Fan, Chunzhen

doi:10.1016/j.rinp.2023.106216

Cited by 13 publications

(4 citation statements)

References 33 publications

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“…They are ended up with a temperature distribution at all locations. It can be concluded that the drop of temperature in the first atmospheric window is 5.1 ∘ C from 300 K. [25] The broad band absorption in our radiative cooling design is mainly caused by the inherent absorption of the complex dielectric medium. The imaginary part of the refraction index dominates the broad band absorption.…”

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confidence: 90%

Ultra-Broadband Thermal Emitter for Daytime Radiative Cooling with Metal-Insulator-Metal Metamaterials

Yin

Fan

2023

Chinese Phys. Lett.

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A novel thermal emitter with MIM design is proposed to realize efficient daytime radiative cooling in this work. It can achieve ultrahigh absorption of 99.67% in the first atmospheric window and strong reflection of 94.86 % in solar band. Analysis on the cooling performance with different real and imaginary part of refractive index has been carried out to provide a guide line in the material choice. As a case study, three inorganic materials were substituted to get enhanced absorption and it is verified that the refractive index matching is desirable to obtain high absorption. In addition, such high emissivity persists under different incident angles in both TE and TM mode. A net cooling power of 96.39 W/m2 is achieved in the day time with the incorporation of convection coefficients. Finally, this thermal emitter achieves an average temperature drop of 5.1℃ based on the solution of conduction equation at 300 K. Therefore, our design with an excellent cooling ability can further bolster the development in the management of radiative cooling or thermal radiation.

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confidence: 90%

Ultra-Broadband Thermal Emitter for Daytime Radiative Cooling with Metal-Insulator-Metal Metamaterials

Yin

Fan

2023

Chinese Phys. Lett.

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“…Radiative cooling (RC) allows for e cient heat dissipation by emitting thermal radiation into outer space through the atmospheric window 7,8 . Various daytime radiative-cooling coatings have been developed over recent years and succeeded in cooling to sub-ambient temperatures 9 , such as inorganic particles dispersion 10,11 , porous polymers 12,13 , micro-structures 14 , and nano-fabricated layered structures [15][16][17] . These studies 18,19 have demonstrated the important advancement in modulation of the full spectral range of solar and blackbody radiation [20][21][22] .…”

Section: Introductionmentioning

confidence: 99%

Pillar-Pore-Structured Nanophotonic Coating with Superior Solar and Thermal Modulation Abilities

Yanfeng

2024

Preprint

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There is a growing focus on the development of advanced materials to enhance energy efficiency in space heating and cooling, which accounts for 13% of the annual consumption of global energy. Wavelength-selective dynamic regulation is undisputedly requisite to solve this problem. Radiative cooling materials work in the wavelength span of 8-14 µm, which is effective in heat dissipation. However, their fixed emissivity results in unpleasant undercooling. Adaptive cooling materials can change emissivity in response to temperature shifts, solving the problem of overcooling, however they absorb too much solar heat in daytime, especially in summer. Hence, a material is requisite to have high reflectance in solar wavelengths (0.25 – 2.5 µm). To address this issue, we propose a temperature-adaptive radiative cooling coating with high solar reflectance that efficiently reflects solar radiation and automatically switches its sky-window emissivity from 0.19 to 0.74, delivering an 85.92% solar reflectance for optimal energy efficiency and all-year-round thermal comfort within a specific climate zone. The simulations demonstrate that our sample surpasses existing roofing coatings in terms of energy efficiency across different climate zones, particularly those with substantial seasonal variations.

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“…PIT involves the manipulation of light transmission in metamaterials through the interaction of plasmonic resonances with constituent unit cells [7][8][9]. In the early stage, the constructed metamaterials primarily utilize the metallic or dielectric unit cells [10][11][12][13][14][15][16][17]. Recently, the combination of metamaterials with two-dimensional (2D) materials such as graphene and BP to realize PIT effect has attracted much attentions [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Tunable plasmon-induced transparency in anisotropic graphene-black phosphorus photonic device for high-performance sensors and switchers

Wang,

Xie,

Fan

2024

J. Phys. D: Appl. Phys.

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A novel photonic device composed of graphene and black phosphorus (G-BP) has been proposed, which achieves high-performance plasmon-induced transparency (PIT) effect within the THz range and maintains substantial tunability and anisotropy. The anisotropy of the PIT effect arises from the near-field coupling between two bright modes characterized by distinct effective electron masses of BP, resulting transparency window at 33.35 THz for TE polarization and at 26.92 THz for TM polarization. Through the modulation of Fermi energy in graphene, doping levels of BP and geometric parameters separately, a tunable transparency window is achieved. Notably, the convergence or divergence of the anisotropic transparency windows can be well manipulated with different BP doping levels. Furthermore, the proposed G-BP photonic device exhibits a high sensitivity to changes in the surrounding refractive index and substrates, with a maximum sensitivity of 12.04 THz/RI, rendering it suitable for sensor applications. Overall, the proposed photonic device exhibits notable PIT effects characterized by high anisotropic performance, substantial tunability, great sensitivity, and stability, making it a promising candidate for applications in sensors, polarizers, and switchers.

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Realization of an efficient radiative cooling emitter with double layer inorganic SiO2 and TiO2 metamaterial

Cited by 13 publications

References 33 publications

Ultra-Broadband Thermal Emitter for Daytime Radiative Cooling with Metal-Insulator-Metal Metamaterials

Ultra-Broadband Thermal Emitter for Daytime Radiative Cooling with Metal-Insulator-Metal Metamaterials

Pillar-Pore-Structured Nanophotonic Coating with Superior Solar and Thermal Modulation Abilities

Tunable plasmon-induced transparency in anisotropic graphene-black phosphorus photonic device for high-performance sensors and switchers

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