Influences of the refractive index of defect layer on far-infrared spectral characteristics of 1-D doped photonic crystal

This Photonic crystal can realize thermal infrared stealth based on photonic band gaps in the far infrared wavelengths, and doped photonic crystal can realize “hole-digging” spectrum in military laser wavelength of 10.6μm, so as to realize the compatible laser and infrared stealth. In this paper, we selected the far infrared-transparent materials, PbTe and ZnSe as high refractive index and low refractive index material respectively, and designed two different 1-D doped photonic crystals to achieve compatible stealth of laser(λ=10.6μm) and far-infrared of 8~14μm. The spectral characteristics and influences of the refractive index of doped layer on far-infrared spectral of two doped photonic crystals were calculated by Transfer matrix method, and the optimal values of the refractive index of doped layer were obtained too. This point out the direction for preparation of 1-D doped photonic crystals to achieve compatible stealth of laser and infrared by “hole-digging spectral”.