Design of Ge/ZnSe One-Dimensional Photonic Crystal and Visible/Infrared Reflectance Spectroscopy Control
Photonic crystals have attracted great research interest due to their potential applications in optical stealth,but in practical research,there is relatively little focus in stealth structures that are compatible with both visible and infrared bands.In this article,a Ge/ZnSe photonic crystal structure that stealth in three bands:visible light(0.4-0.8 μm),mid-infrared(3-5 μm),and far-infrared(8-14 μm)was designed.Firstly,a Ge/ZnSe photonic crystal with an average reflectivity of 83.63％in the mid-infrared(3-5 μm)band and an average reflectivity of 83.2％in the far-infrared(8-14 μm)band was obtained by modulating the film thickness and number of cycles of the photonic crystal,indicating its excellent high reflectivity characteristics in the mid and far infrared spectra.Afterwards,by adding an MgF2 thin film to the top layer of the photonic crystal structure,the visible light reflectance can be reduced to 20％,thereby achieving high transparency and low visibility for visible light.On the other hand,an MgF2/Ge photonic crystal structure can also be added to the top layer of the photonic crystal to increase the visible light reflectance to 70.1％,thereby suppressing the absorption of solar energy by the material under illumination conditions.suppressing the temperature rise,and assisting in reducing infrared radiation characteristics.
photonic crystalinfrared emissivitymulti band compatibilityvisible light reflectance
万方数据
维普
