Abstract
In this paper, a generalized design principle is proposed that can realize efficient multi-spectral manipulation with a single device. By employing the transfer matrix method accompanied with genetic algorithm, the designed metamaterials with simple geometries can achieve broadband infrared absorption as well as tunable reflective colors simultaneously. The average absorptivity from 8 to 13 μm is higher than 95%, and maintains high performance even at large incident angles. Besides, since the structural colors were originated from the thin-film interference effects, the color of these devices can be easily tuned from blue to pink by varying the thickness of the top layer. The features described above indicate that the proposed structures can be used for many practical applications such as multi-spectral imagers, bolometers, solar cell and radiative coolers, while can also meet people’s aesthetic or functional requirements for the surface color of objects.
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