Abstract
We demonstrate a novel infrared stealth structure consisting of SiO2/TiO2 film, which was manufactured as the highly stretchable triangular wrinkle structures. The triangular wrinkle structures have firstly been transferred to the flexible substrate from the surface of Si-substrate, which was manufactured by the MEMS technology. Then, the infrared reflective film have been manufactured to be the triangular wrinkle structures by depositing the materials (noble metal (Ag or Au) or multilayer oxide (SiO2/TiO2)) on the surface of flexible substrate. Due to the lower reflection effect of curved surface, the infrared reflectivity of these structures has been tuned down to 5%. And, compared to the flat surface, the reflection-to-diffuse ratios improved approximately one order of magnitude. These structures can adapt to the environment by changing the reflectivity of triangular wrinkle structures under stretching. Finally, an Au-modified infrared stealth structure has been fabricated as the array structures, which disappeared and then display by stretching the triangular wrinkle structures at room temperature. It features high reflection-to-diffuse ratios, stable repeatability, low-cost, and easy to manufacture. It may open opportunities for infrared camouflage for military security and surveillance field application.
Highlights
Infrared stealth technology has been widely used in field of spacecraft components [1], camouflage platforms [2], protective clothing [3], container packaging [4], and so on [5–7]
The topography of the triangular wrinkle structure were characterized by laser scanning microscope (Model: LEXT OLS4100; Co.: Olympus) and atomic force microscope (AFM) (Model: Multimode8; Co.: Bruker)
The model of infrared stealth was simulated by the software of Zemax
Summary
Infrared stealth technology has been widely used in field of spacecraft components [1], camouflage platforms [2], protective clothing [3], container packaging [4], and so on [5–7]. To the military security and military surveillance field, which can protect the aircraft from detection. Many materials, which statically reflect radiation in the infrared region of the electromagnetic spectrum, have been studied [8–10]. Wei et al [11] proposed a metamaterial-based infrared reflection method by modulating the photo-generated carrier doping. Kocabas et al [12] demonstrate active surfaces structures that can be controlled to tune the reflection, transmission, and absorption of microwaves. This kind of novel material was confined by complex technology, ultra-low production, and high cost
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