Wideband Near-Infrared Absorber with high manufacturing tolerance utilizing MXene Metasurface for industrial thermal applications

This study presents a polarization-insensitive, wideband solar absorber and thermal emitter made of plus-shaped fractal MXene metasurface. The proposed structure shows a high average absorption rate and photon-to-thermal energy conversion efficiency of above 90% from 750 to 3300 nm. The result findings reveal that wideband high absorption and excellent photothermal conversion efficiency is a result of localized surface plasmon resonance (LSPR) exists within the design structure. Besides that, the proposed structure also shows incident wave angular stability over the wide angular range up to 60 ⁰ . Moreover, the proposed structure shows high manufacturing tolerance when different parameters of unit cell design varies up to ± 10–15%. The understanding of high absorption characteristics is explored by surface electric field at various operating wavelengths. The proposed wideband absorption would be useful for energy harvesting applications, thermophotovoltaic, high power electronics devices, and infrared imaging.