Based on one-dimensional photonic crystals (1D PCs), we studied an innovative multispectral compatible stealth material for visible light, infrared, and 1.06-μm laser. The fabricated PCs had advantages of different colors, low emissivity in the atmospheric windows, and low reflectance at 1.06-μm waveband. According to some relevant experiments, the prepared films possessed colors of yellow, green, and blue, which could be used to simulate the color of the desert, woodland, and ocean, respectively. The infrared stealth performance of films showed that the thermal radiation in the atmospheric windows of 3 to 5 μm and 8 to 14 μm could be reduced effectively. In addition, the films’ reflectance spectra measured by spectrometer indicate that the reflectance at 1.06 μm is below 20%, which, in practice, could enormously reduce the echo power of incident lasers.
In order to realize the laser and thermal infrared compatible stealth, a photonic crystal (PC) stealth film for 1064nm laser and mid-and-far infrared is designed by using the heterostructure method and characteristic matrix method. The results show that the reflectivity of this PC film at the wavelength of 1064nm is as low as 1%, meaning that it can reduce the reflectivity echo of 1064nm laser. In the meantime, the reflectivity of this PC film in 3-5μm and 8-14μm wavebands is 94.3% and 84.1% respectively, allowing the PC film to suppress the thermal radiation of the heat source. Furthermore, the impact of the incident angle on the reflectivity of the PC film is very small, whether in 1064nm wavelength or mid-and-far infrared wavebands. Therefore, this PC film can realize the compatible stealth of 1064nm laser and thermal infrared.
A compatible green stealth photonic thin films against near infrared and 1. 54μm laser, based on the structure of photonic thin films are designed to achieve compatible stealth of targets in background of green plants. Optical thin films have the advantage of regulating characteristics of the beam transmission. In this paper, the thin films are designed to simulate NIR Plateau of the spectral characteristics of green plants in the range of 0.78μm to 1.3μm and form a reflection Valley at 1.54μm. Based on the transfer matrix method (TMM) of thin-films optical theory , the Needle Algorithm and Tunneling Algorithm of thin-film automatic design methods are combined to optimize and design the green thin films. Finally, the near infrared green optical thin films with NIR spectral characteristics similar to the green plants are designed. And the spectral curve has a reflection valley near the center wavelength of 1.54μm ,and the reflectivity of the wavelength of 1.54μm is as low as 5%,achieving the stealth of the laser detector with the wavelength of 1.54 μm. On this basis, the influence of four incident angle of 0°,10°,20°and 30° on the spectral curve is analyzed. The results show that the spectral curves still meet the design requirements.
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