School of Aeronautics, Harbin Institute of Technology, China
Zhengzhou Research Institute, Harbin Institute of Technology, China
School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore
Bio: Sam Zhang(Sam Zhang Shanyong, 張善勇), FRSC, FTFS, FIoMMM, academically known as Sam Zhang, was born and brought up in the famous “City of Mountains” Chongqing, China. He earned a Bachelor of Engineering in materials in 1982 at Northeastern University (Shenyang, China), a Master of Engineering in materials in 1984 at Iron & Steel Research Institute (Beijing, China), and a PhD in ceramics in 1991 at the University of Wisconsin–Madison,
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Research Area: Preparation and characterization of hard and yet tough ceramic nanocomposite coatings; Functional thin films; Biological coatings; Drug delivery for and coatings for clean energy.
Speech title: Visible Light and Infrared Camouflage Based on Epsilon Near Zero Materials
Abstract: As advanced detection technologies advance toward intelligent capabilities, the camouflage has become increasingly prominent. In recent years, research has focused on integrating infrared directional thermal emission and selective full-angle thermal emission in the long-wave infrared spectrum with visible light camouflage through structural innovations, including multilayer photonic crystals, phase-change materials, equidistantly excited gratings, and 2D materials. To date, the integration of infrared directional thermal emission with visible light camouflage remains unexplored in published literature. This study proposes a novel approach for achieving infrared directional thermal emission by employing gradient epsilon-near-zero (ENZ) materials. Thin film structures, including Al2O3/TiO2/Ge/SiO2/SiO and TiO2/Ta2O5/Ge/Y2O3/MgO, are designed to facilitate directional thermal radiation emission in the 8–12 and 12–16 μm bands, respectively. These structures enable the selective detection of p-polarized infrared signals at specific angles, thereby advancing infrared camouflage strategies. Furthermore, leveraging the thin-film interference effect of visible light, a color modulation layer is incorporated into the gradient ENZ structure. By manipulating the thickness of the ZnS film layer, extensive color variations can be achieved, thereby providing a foundation for visible light camouflage applications.