Semimetal–dielectric–metal metasurface for infrared camouflage with high-performance energy dissipation in non-atmospheric transparency window

Nanophotonics, Journal Year: 2025, Volume and Issue: 14(8), P. 1101 - 1111

Published: Jan. 16, 2025

Abstract The development of novel camouflage technologies is great significance, exerting an impact on both fundamental science and diverse military civilian applications. Effective aims to reduce the recognizability object, making it effortlessly blend with environment. For infrared camouflage, necessitates precise control over surface emissivity temperature ensure that target blends effectively surrounding background. This study presents a semimetal–dielectric–metal metasurface emitter engineered for application camouflage. metasurface, total thickness only 545 nm, consists Bi micro-disk array continuous ZnS Ti film beneath it. Unlike conventional metal-based design, our approach leverages unique optical properties Bi, achieving average 0.91 in 5–8 μm non-atmospheric transparency window. Experimental results indicate achieves lower radiation actual temperatures compared those observed comparative experiments, highlighting its superior energy dissipation thermal stability. offers advantages such as structural simplicity, cost-effectiveness, angular insensitivity, deep-subwavelength features, rendering suitable range applications including anti-counterfeiting, potential broad deployment technologies.

Language: Английский

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Tunable structural colors based on grayscale lithography and conformal coating of VO₂

Nanophotonics, Journal Year: 2025, Volume and Issue: 14(8), P. 1123 - 1133

Published: Jan. 17, 2025

Structural colors generated by optical micro-/nanostructures offer a notable advantage over traditional chemical pigments, including higher purity, greater brightness, resistance to fading, and enhanced environmental friendliness. However, achieving dynamically switchable color displays with high performances without resorting complex nanofabrication methods remain challenge. Here, we present simple method using grayscale lithography conformal coating create Salisbury screen (SS) cavities variable resonant wavelengths, enabling the formation of tunable colorful patterns. The dynamic display is achieved through phase change vanadium dioxide (VO2) nanostructures under electrothermal effects. At low actuation voltage 1.4 V, switching such as sensitivity, fast speed, repeatability, wide-view angle are achieved. structural colors, featuring preparation process high-speed switching, represent promising alternative for applications thermal sensors, security information encryption, full-color displays.

Language: Английский

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Space-to-ground infrared camouflage with radiative heat dissipation

Light Science & Applications, Journal Year: 2025, Volume and Issue: 14(1)

Published: March 26, 2025

Abstract With the development of space exploration and exploitation, it is imperative to address potential threats posed objects, particularly ground-based infrared observation. However, in extreme environment, achieving camouflage across different bands with simultaneous thermal management challenging has so far slipped out concern. Here, we propose space-to-ground strategy, compatible radiative heat dissipation. Camouflage H, K, mid-wave-infrared (MWIR), long-wave-infrared (LWIR) achieved through a multilayer structure, dissipation very-long-wave-infrared (VLWIR) band. High absorptivity (0.839/0.633) H/K minimizes reflected signal solar radiation low emissivity (0.132/0.142) MWIR/LWIR suppresses signal. Additionally, high (0.798) VLWIR band ensures efficient management, resulting temperature decrement 39.8 °C metal reference simulated environment (with 1200 W m − 2 input). This work inspires sophisticated spectral manipulation environments guides techniques for objects.

Language: Английский

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A multi-scale hierarchically omnidirectional strategy to elevate crossband camouflage and anti-icing properties

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 500, P. 157515 - 157515

Published: Nov. 1, 2024

Language: Английский

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Interfacial Confinement Derived High‐Strength MXene@Graphene Oxide Core‐Shell Fibers for Electromagnetic Wave Regulation, Thermochromic Alerts, and Visible Camouflage

Small, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 13, 2025

Abstract Although electrically conductive Ti₃C₂T x MXene fibers are promising for wearable electronics, the poor inter‐sheet interactions and random stacking structure of sheets seriously hinder electron transport load transfer fibers. Herein, mechanically strong MXene@graphene oxide (GO) core‐shell fabricated with a coaxial wet‐spinning methodology electromagnetic wave regulation, thermochromic alerts, visible camouflage. During wet‐spinning, trace‐carboxylated GO in shell align readily because spatial confinement needle, while core progressively oriented flattened shell. The positively charged chitosan coagulating solution enhances interfacial between facilitates sheet′s orientation inside Consequently, highly aligned exhibit an ultrahigh tensile strength 613.7 MPa outstanding conductivity ≈7766 S cm −1 . Furthermore, fiber‐woven textiles not only offer excellent interference shielding performance but also achieve quantitative regulation transmission by adjusting angle double‐layered textiles. can combine coatings thermotherapy visual warnings,

Language: Английский

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Lithography-free thermal camouflage device with efficient thermal management for ultrahigh-temperature objects

Applied Thermal Engineering, Journal Year: 2025, Volume and Issue: unknown, P. 126031 - 126031

Published: Feb. 1, 2025

Language: Английский

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Photonic structures in multispectral camouflage: From static to dynamic technologies

Materials Today, Journal Year: 2025, Volume and Issue: unknown

Published: March 1, 2025

Language: Английский

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Functional Multispectral Camouflage Strategy Based on Flexible Transparent Metamaterial Compatible with Radiative Cooling

Laser & Photonics Review, Journal Year: 2025, Volume and Issue: unknown

Published: March 19, 2025

Abstract Multispectral‐compatible camouflage technology is an inevitable choice to counter the rapidly evolving integrated detection methods. Nevertheless, current multi‐spectral strategies face challenges, including inadequate performance compatibility across bands, insufficient comprehensive and limited applicability diverse scenarios. A novel functional multispectral strategy with practical application potential proposed here. This integrates infrared microwave metamaterials into a flexible transparent structure, achieving infrared, microwave, laser bands while maintaining flexibility optical transparency. features simple fabrication process compatible mature micro‐nano techniques, enabling large‐scale production of samples. In proof‐of‐concept demonstration, sample area 18 × cm 2 fabricated based on processing technology. Experimental results show that design achieves: high visible transmittance (>60%), low emissivity (0.36/0.35) in atmospheric window, (0.62) non‐atmospheric reflectance (<0.2) at 1.55 µm, absorptivity (>0.9) 4.4–18 GHz. The robustness absorption under different conformal conditions has been confirmed. work addresses several limitations technologies unlock new opportunities areas such as signal control, thermal management, wearable stealth protection.

Language: Английский

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Narrowband thermal emitter based on quasi-Tamm phonon polaritons in uniaxial hyperbolic materials

Case Studies in Thermal Engineering, Journal Year: 2025, Volume and Issue: unknown, P. 106243 - 106243

Published: May 1, 2025

Language: Английский

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Visible-infrared compatible and independent camouflage with multicolor patterns and tunable emissivity

Nanophotonics, Journal Year: 2024, Volume and Issue: 13(17), P. 3123 - 3133

Published: May 16, 2024

Abstract With the rapid development and wide application of visible (VIS) infrared (IR) detections, it is necessary to explore visible-infrared (VIS-IR) compatible camouflage. Here, we report a VIS-IR independent camouflage device which composed upper IR-transparent VIS-color-patterned layer lower electrochromic IR layer. The has amorphous photonic structure polystyrene nanospheres (PSNSs). By customizing PSNS size, various colors can be realized for VIS takes advantage multiwall carbon nanotubes (MWCNTs) as electrode well active material. Experimental results reveal that different (including blue, green, purple) have been obtained, emissivity electrically regulated from 0.43 0.9. Moreover, prototype also exhibits good electrical stability hydrophobic characteristic (the water contact angle outmost surface exceeds 120°). These output performances demonstrate success our design strategy promoting finding applied in fields energy conservation fields.

Language: Английский

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