Laser and infrared compatible stealth from near to far infrared bands by doped photonic crystal

Abstract Photonic crystals can realize broadband thermal infrared stealth based on its high-reflection photon forbidden band. By forming a “hole-digging” reflection spectrum of doped photonic crystals at military laser wavelength of 1.06 μm and 10.6 μm, compatible stealth of laser and infrared can be achieved. We selected lead telluride (PbTe) and cryolite (Na 3 AlF 6 ), and designed a one-dimensional two-defect-mode photonic crystal based on principles of distributed Bragg reflector micro-cavity. The reflection and transmission spectra of the photonic crystals were calculated by transfer matrix method of thin-film optical theory. The calculation results show that the designed multi-cycle dual-hetero-junction photonic crystal has a high spectral reflectance in the near, middle and far infrared band, whose spectral reflectance is greater than 99% in 1∼5 μm and 8∼14 μm infrared bands, and spectral transmittance at 1.06 μm and 10.6 μm is greater than 96%. This will satisfy the laser and infrared compatible stealth in the near, middle and far infrared bands