A thermally robust and optically transparent infrared selective emitter for compatible camouflage

Abstract

Infrared selective emitter (ISE) captures growing attention of researchers due to its specific functionality of tuning infrared radiance to camouflage object into the background, which provides an efficient access to...

Epsilon-near-zero material-based bi-layer metamaterials for selective mid-infrared radiation

“…Additionally, the spectrum irradiance in the detected bands and the undetected band were integrated, respectively, to evaluate degree of energy loss for MIR camouflage. The spectral irradiance is calculated by following equation [20]: T, c, k, and h are the blackbody emissive power, wavelength, temperature, velocity of light in vacuum, Boltzmann constant, and Planck's constant. As we can see in figure 5(a), the peak of the emissive power of the bi-layer metamaterials blueshift as temperature rises.…”

“…To alleviate the severe heat instability and lower surface temperature, high emissivity is essential in the undetected band 5-8 mm for radiative cooling, and selective MIR emitters have been recommended. Metamaterials [4,[13][14][15][16][17], photonic crystals [7,18,19], and multilayer films [3,20,21] can be employed for implementing the selective emissivity performance. Generally, the selective MIR emitter contains precise patterns or stacking composed of metal and dielectric, which satisfies the desired spectral emissivity in 5-8 mm and keeps low emissivity in the detected band.…”

A tunable infrared emitter based on phase-changing material GST for visible-infrared compatible camouflage with thermal management

“…To date, visible-infrared compatible camouflage devices have been successfully developed by using plasmonic metamaterials, [30][31][32] photonic crystals, [33][34][35] multilayer film structures [36][37][38][39][40][41] and composites. [42][43][44] For instance, Wu et al proposed an optically transparent infrared emitter composed of a metalinsulator-metal nanostructure to achieve visible-infrared compatible camouflage and radiation heat dissipation.…”

Synthesis and Characterization of Schiff Base Polymers via Metal Coordination and Its Application in Infrared Stealth Coating

“…According to the Stefan–Boltzmann law, the intensity of the mid-far infrared signal emitted from an object is proportional to the surface emissivity (ε) and the fourth power of absolute temperature (T). Therefore, controlling temperature and surface emissivity are two means to achieve mid-far infrared stealth [ 6 , 7 ]. However, temperature control is too difficult because this method requires additional cooling and heating equipment and increases the weight of the aircraft [ 8 , 9 ].…”