Visible-infrared Spectrum Design and Radiation Characteristics Analysis of Photonic Crystal Films
To analyze the correlation characteristics between visible-infrared spectrum and infrared radiation of photonic crystal films,three kinds of Ge/ZnS photonic crystal films with different visible reflectance and the same infrared emissivity are designed.By simulating the infrared radiation characteristics of photonic crystal structures,the influence of solar illumination and reflection spectrum on the infrared radiation characteristics of the films in vacuum and atmospheric environments is discussed.The simulated results show that the difference of visible reflectance will lead to the discrepancy of surface temperature in the presence of sunlight.For infrared radiation,the high reflection surface will reflect solar radiation at low temperature for 3～5μm waveband,which has a negative impact on infrared camouflage.For 8～14μm waveband,when the infrared emissivity is low enough,the infrared radiation emittance of the photonic crystal structures is close.The fabrication of samples and the measurement of reflection spectrum and infrared thermography are carried out.The test results show the consistency with the simulation,and verify the infrared camouflage performance of three films.The research results are helpful to understand the visible-infrared spectrum and infrared radiation correlation characteristics of photonic crystal films,and provide reference for the spectral design and application scheme of visible-infrared camouflage materials compatible with microwave camouflage.
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