Three-Layered Thin Films for Simultaneous Infrared Camouflage and Radiative Cooling

Zhang, Luyu; Zhang, Wenjie; Liu, Yuanbin

doi:10.3390/ma16114188

Cited by 3 publications

(3 citation statements)

References 48 publications

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“…In Figure , the genetic algorithm is a biomimetic optimization approach that emulates the processes of selection, crossover, and mutation observed in biological genetics . Commencing with a randomly generated initial population, the GA iteratively refines individuals, adapting them to the environment by employing genetic operators.…”

Section: Theorymentioning

confidence: 99%

“…In Figure 2 , the genetic algorithm is a biomimetic optimization approach that emulates the processes of selection, crossover, and mutation observed in biological genetics. 48 Commencing with a randomly generated initial population, the GA iteratively refines individuals, adapting them to the environment by employing genetic operators. Over the processes of optimization, this iterative process leads the population to evolve, ultimately converging toward an optimal solution within the specified parameter range.…”

Section: Theorymentioning

confidence: 99%

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Optimization of Dielectric-Metal Multilayer Structure for Color-Preserving Radiative Cooling Window

Liu,

Chen,

Lin

2024

ACS Omega

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Radiative cooling window has been designed to emit infrared radiation in the atmospheric transparency window and reflects near-infrared light while allowing visible light to pass through. However, improvements are still needed in the transmissivity of visible light, the reflectivity of near-infrared light, and emissivity of mid-infrared spectra. This paper proposes a color-preserving radiative cooling window consisting of a multilayer film as a transparent nearinfrared reflector and polydimethylsiloxane (PDMS) as a thermal emitter. This design involves optimizing the types of film materials, the number of layers, and the thicknesses of the films through a genetic algorithm. The performance of multilayer films with various layer numbers is compared, and we choose 7-layer multilayer film (Al 2 O 3 /Ag/Al 2 O 3 /Ag/Al 2 O 3 /Ag/Al 2 O 3 ) as the transparent near-infrared reflector. Then, we analyze its spectral characteristics in depth. Sequentially, we place a 100-μm-thick PDMS as a thermal emitter above the transparent near-infrared reflector. By combining the transparent near-infrared reflector with the PDMS and utilizing genetic algorithm, a color-preserving radiative cooling window has been achieved with flat and broadband average visible transmittance (86%), high average near-infrared reflectance (86%), high average thermal emissivity (95%) in the atmospheric window, and the drop of temperature (22.3, 21.2, and 15.8 K when nonradiative heat coefficient is, respectively, 0, 6, and 12 W/m 2 /K).

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Section: Theorymentioning

confidence: 99%

Section: Theorymentioning

confidence: 99%

Optimization of Dielectric-Metal Multilayer Structure for Color-Preserving Radiative Cooling Window

Liu,

Chen,

Lin

2024

ACS Omega

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“…Among a variety of energy-saving glasses, metal/dielectric multilayer films have been widely discussed in the academic world because of their simple structure, high visible light transmittance and high near-infrared reflectivity. Currently, metal/dielectric multilayer films have important applications in energy-saving glass [3][4][5][6][7][8][9], solar energy utilization [10][11][12][13][14][15][16][17], infrared stealth [18][19][20][21][22][23][24], and other fields. The core idea is to optimize the thickness and material of each film layer to achieve regulation of the radiation characteristics of each band.…”

Section: Introductionmentioning

confidence: 99%

Design, preparation, and property analysis of metal/dielectric multilayer film with wavelength selectivity

Wu,

An,

Dong

et al. 2024

J. Phys.: Condens. Matter

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Metal/dielectric multilayer films have important applications in energy-saving glass, stealth materials, solar energy utilization and other fields. In the current study, the thickness of each layer of TiO2/Ag/TiO2/Ag/TiO2 film is optimized. The effects of the number of metal/dielectric multilayer films and the incident light angle on their optical properties were investigated. The TiO2/Ag/TiO2/Ag/TiO2 film was prepared by electron beam evaporation coating technology, and their reflectance and transmittance were measured. The measurement results show that the visible light transmittance (380–780 nm) of the film can achieve 68.7%, and the infrared reflectance (780nm–2500nm) can reach 95.9%. Compared with the traditional dielectric/metal/dielectric three-layer film, the visible light transmittance of the film is higher, and the solar infrared reflectance is greatly improved. In the solar radiation band (280nm–2500nm), the average error between the experimental reflectance and transmittance and the theoretical prediction results is less than 0.03. The distribution of electric and magnetic fields inside the film was simulated by Finite-Difference Time-Domain (FDTD) Method. The simulation results show that the high visible light transmittance is due to the interference resonance of electromagnetic waves inside the film. Taking Shanghai as an example, under our calculation conditions, compared with ordinary SiO2 glass, TiO2/Ag/TiO2/Ag/TiO2 film can reduce the total energy consumption of buildings by 14.3% and refrigeration energy consumption by 17.2%.

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Research Progress and Recent Advances in Development and Applications of Infrared Stealth Materials: A Comprehensive Review

Zhou,

Rather,

et al. 2024

Laser & Photonics Reviews

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In modern war of “find and destroy,” hiding the target is one of the essential means to improve battlefield survivability of personnel, weapons, and equipment. Infrared stealth technology started to emerge when hiding in the visible light band could no longer meet the protection requirements. With the rapid development of infrared detection technology, infrared stealth materials are gradually diversified. At present, infrared stealth technology no longer focuses only on low infrared emissivity, but from multiple perspectives to achieve target stealth, such as the tunability of optical properties, good thermal management, and multi‐spectral compatibility stealth. At the same time, the infrared stealth of the target is gradually shifted from passive to active, emphasizing dynamic integration of the target and the environment. This review summarizes research progress, development, and application of infrared stealth materials. Camouflage dye and infrared stealth coating are classified as traditional technologies, however new developments and novel processes from literature can be constantly retrieved over the years. In addition to dyeing/coating technologies, this review also highlights advanced infrared stealth materials such as thermal insulation materials, phase change materials, electrochromic materials, metamaterials, and bionic materials. Outlines of the advanced technologies are mainly focused on those published in recent years. Challenges and prospects for the future development of infrared stealth materials are presented at the end of the review.

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Three-Layered Thin Films for Simultaneous Infrared Camouflage and Radiative Cooling

Cited by 3 publications

References 48 publications

Optimization of Dielectric-Metal Multilayer Structure for Color-Preserving Radiative Cooling Window

Optimization of Dielectric-Metal Multilayer Structure for Color-Preserving Radiative Cooling Window

Design, preparation, and property analysis of metal/dielectric multilayer film with wavelength selectivity

Research Progress and Recent Advances in Development and Applications of Infrared Stealth Materials: A Comprehensive Review

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