posted on 2022-02-04, 16:04authored bySiqi Fu, Wang Zhang, Yu Wu, Junlong Tian, Qinglei Liu, Jiajun Gu, Fang Song, Maurice I. Osotsi, Di Zhang
Continuous
development and advancement in modern detection technologies
have increased the demand for multiband (e.g., visual and infrared)
compatible camouflage. However, challenges exist in the requirements
of incompatible structure resulting from the adaptation to different
camouflage effects. This study is inspired by the light absorption
structure of butterfly wing scales and demonstrates a porous anodic
alumina/aluminum flake powder material prepared by a microscopic powder
anodic oxidation technique for visual and infrared camouflage. The
fabricated structures manipulate a compromise condition for visual
camouflage by low reflectance (R̅400‑800nm = 0.32) and dual-band infrared camouflage by low emission (ε̅3‑5μm = 0.081 and ε̅8‑14μm = 0.085). Further, the characteristic of short-range disorder in
these bioinspired structures allows maintenance of the camouflage
performance under omnidirectional detection (0–60°). This
study provides new insight and a feasible method for coordinated manipulation
of electromagnetic waves via bioinspired structural design and improved
fabrication.