Multi-band middle-infrared-compatible camouflage with thermal management via simple photonic structures

Pan, Meiyan; Huang, Yun; Li, Qiang; Luo, Hao; Zhu, Huanzheng; Kaur, S.; Qiu, Min

doi:10.1016/j.nanoen.2020.104449

Cited by 185 publications

(120 citation statements)

References 35 publications

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“…To control the surface emittance, nanostructure-based surfaces (e.g., metasurfaces 3,8 and metallic-dielectric nanowires 9 ) or films (metal 10 , semiconductor 11,12 , and multilayer films [13][14][15][16][17] ) are demonstrated with low-surface emittance over the whole IR range, and yet the radiative heat transfer is blocked, causing severe heat instability 18 . Wavelength-selective emitters [19][20][21][22][23][24][25] with radiative cooling [26][27][28][29][30][31] in the non-atmospheric window (5-8 μm) 18,20,32 are adopted to mitigate the heat instability without influencing the IR camouflage. However, they cannot operate at high temperature (<523 K) 18,20,32 .…”

Section: Introductionmentioning

confidence: 99%

“…Wavelength-selective emitters [19][20][21][22][23][24][25] with radiative cooling [26][27][28][29][30][31] in the non-atmospheric window (5-8 μm) 18,20,32 are adopted to mitigate the heat instability without influencing the IR camouflage. However, they cannot operate at high temperature (<523 K) 18,20,32 . To control the surface temperature, thermal insulators 33 , phasechange materials 33 , and transformation thermotics [34][35][36][37] have been proposed.…”

Section: Introductionmentioning

confidence: 99%

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High-temperature infrared camouflage with efficient thermal management

et al. 2020

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High-temperature infrared (IR) camouflage is crucial to the effective concealment of high-temperature objects but remains a challenging issue, as the thermal radiation of an object is proportional to the fourth power of temperature (T 4). Here, we experimentally demonstrate high-temperature IR camouflage with efficient thermal management. By combining a silica aerogel for thermal insulation and a Ge/ZnS multilayer wavelength-selective emitter for simultaneous radiative cooling (high emittance in the 5-8 μm non-atmospheric window) and IR camouflage (low emittance in the 8-14 μm atmospheric window), the surface temperature of an object is reduced from 873 to 410 K. The IR camouflage is demonstrated by indoor/outdoor (with/without earthshine) radiation temperatures of 310/248 K for an object at 873/623 K and a 78% reduction in with-earthshine lock-on range. This scheme may introduce opportunities for high-temperature thermal management and infrared signal processing.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High-temperature infrared camouflage with efficient thermal management

et al. 2020

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“…Metamaterials, which are artificially materials composed of periodically arranged subwavelength structures, have attracted increasing attention due to their extraordinarily flexible modulation ability to the amplitude, phase, and polarization of the electromagnetic waves. [ 1,2 ] By leveraging the prominent advantages of the metamaterials such as the ultracompact structure, on‐chip integration, and multifunction capability, researchers have explored kaleidoscopic potential applications for them, meta‐lenses, [ 3,4 ] spectrometers, [ 5–7 ] hologram, [ 8–10 ] and absorbers, [ 11–26 ] to name a few.…”

Section: Introductionmentioning

confidence: 99%

Ultrathin Electromagnetic–Acoustic Amphibious Stealth Coats

Zhou

Chen

et al. 2020

Advanced Optical Materials

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Radar and sonar technologies are generally used to detect objects in air space and water. In some cases, both technologies are involved in probing waterborne objects like submarines. However, the simultaneous stealth regarding these two detection methods is not well explored due to the difficulty in satisfying material properties for two different physical systems. In this work, an artificial ultrathin amphibious stealth coat with a minimum thickness less than 0.5 mm achieving free‐space microwave and underwater acoustic absorption is proposed and demonstrated. It is realized by combining an electromagnetic metasurface and an acoustic metasurface—a flexible printed circuit with multisized metal resonators and a polydimethylsiloxane film with multisized air cavities. These two alien metasurfaces are engineered with minimized disturbance to each other by controlling the thicknesses of the resonators as thin as possible. A free‐space microwave absorptivity over 80% in the 12.38–13.7 GHz region and an underwater acoustic reflectance less than 10% in the 80–160 kHz region are obtained experimentally. The current work may shed light on advanced stealth technologies of the free‐space microwaves and underwater acoustic waves.

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“…In addition, camou age against active detection systems including microwave and lidar further aggravates the heat instability due to absorbed microwave/laser energy 16 . To mitigate the severe heat instability and reduce surface temperature, high emittance is required in the MIR non-atmospheric window 5-8 μm for radiative cooling 16,27,[33][34][35][36][37] . Although the MIR compatible multispectral camou age including visible 22,34,38 , microwave 16,[39][40][41] , or laser 25,26,42 bands have been demonstrated, there is no existing material that simultaneously satis es all the aforementioned requirements.…”

Section: Introductionmentioning

confidence: 99%

Multispectral camouflage for infrared, visible, lasers and microwave with radiative cooling

Zhu

Tao

et al. 2020

Preprint

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Interminable surveillance and reconnaissance through various sophisticated multispectral detectors present threats to military equipment and manpower. However, a combination of detectors operating in different wavelength bands (from hundreds of nanometers to centimeters) and based on different principles raises challenges to the conventional single-band camouflage devices. In this paper, multispectral camouflage is demonstrated for the visible, mid-infrared (MIR, 3-5 and 8-14 μm), lasers (1.55 and 10.6 μm) and microwave (8-12 GHz) bands with simultaneous efficient radiative cooling in the non-atmospheric window (5-8 μm). The device for multispectral camouflage consists of ZnS/Ge multilayer for wavelength selective emission and Cu-ITO-Cu metasurface for microwave absorption. In comparison with conventional broadband low emittance material (Cr), the IR camouflage performance of this device manifests 8.4/5.9 °C reduction of inner/surface temperature, and 53.4/13.0 % IR signal decrease in mid/long wavelength IR bands, at 2500 W∙m-2 input power density. Furthermore, we revealed that the natural convection in the atmosphere can be enhanced by radiation in the non-atmospheric window, which increases the total cooling power from 136 W∙m-2 to 252 W∙m-2 at 150 °C surface temperature. This work may introduce the opportunities for multispectral manipulation, infrared signal processing, thermal management, and energy-efficient applications.

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Multi-band middle-infrared-compatible camouflage with thermal management via simple photonic structures

Cited by 185 publications

References 35 publications

High-temperature infrared camouflage with efficient thermal management

High-temperature infrared camouflage with efficient thermal management

Ultrathin Electromagnetic–Acoustic Amphibious Stealth Coats

Multispectral camouflage for infrared, visible, lasers and microwave with radiative cooling

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