Research On Mid-far Infrared Radiation, Lasing And Transmission Control Based On One-dimensional Photonic Crystal Film

Infrared light contains most of the energy in the sun.In particular,the infrared light at 3⁵?m or 8¹3?m has minimal loss of light energy as it passes through the atmosphere.Control structure of infrared emission/laser/transmission has widely use in infrared communication,remote sensing,infrared thermal imaging,building energy saving and so on.The one-dimensional subwavelength structure can flexibly regulate the radiation emission/laser/transmission.So in this paper,the one-dimensional infraredradiation/lasercontrolstructureinfrarednarrow-bandradiation source/infrared laser and the one-dimensional infrared transmission control structure doped vanadium oxide thin film are studied in this paper.Firstly,the principle of distributed bragg reflector?DBR?composed of one-dimensional photonic crystal thin films is introduced.Then,the narrow-band radiation source based on metal-dielectric DBR asymmetric cavity and fabrication of Infrared laser based on dielectric DBR Symmetry cavity embedded Nano-base are researched and analysised.At last,the preparation and optical properties of infrared transmittance regulation structure W doped vanadium oxide film were studied.The main findings are summarized as follows:1.Using the structure of one-dimensional photonic crystal multilayer film,the metal-dielectric distributed bragg reflector?DBR?narrow-band infrared radiation source with asymmetric cavity coupling is prepared according to the bragg reflection principle.We have successfully set up a set of measurement system of polarization radiation spectrum with variable angle and variable temperature,and measure the polarization radiation spectrum of narrow band radiation source with variable temperature and angle.The results show that the narrow-band radiation source samples prepared by metal-dielectric DBR asymmetric cavity structure have narrow-band radiation regulation characteristics at 8¹3?m,the peak position of the sample is 10.4?m at 0°angle,the radiancy is 92 and the quality factor is 67.The blue shift of the radiation peak and the splitting characteristics of the s and P radiation peaks will appear after the change of angle,in the circular acceptance range of 2mm at 90?,the measurement of radiation power is up to 2.27 mW.Finally,the infrared radiation imaging of the narrow-band radiation source samples with gold film as the reference shows that the prepared narrow-band radiation source samples have good infrared radiation performance.2.The structure of two dimensional black phosphorus material embedded in a dielectric distributed bragg reflector?DBR?symmetrically optical microcavity is used to achieve the infrared lasing in the 3⁵?m.The samples were prepared in 10*10mm size with a peak position of 3.6?m,a bandwidth of 7 nm and a quality factor of 514.According to the theoretical calculation of optical microcavity with different cavity lengths,the structure can realize the excitation control in the range of 3.5?m and 3.9?m which is near 400nm.3.We propose that the physical thickness of metal V thin films can be rapidly characterized by infrared transmission spectroscopy.The relationship between the transmittance at 1.5?m and the physical thickness of the monolayer metal V film is T=66.65×e^-d/13.14+3.08 which is obtained by negative exponential fitting.A double target co-sputtering method was proposed to successfully fabricate VO₂ thin films with 0%/0.5%/1%/1.5%/2%/different W doped ratios by means of double target co-sputtering combined with precisely controlled film thickness by spectral fitting,vacuum pre-annealing and oxygen partial pressure annealing.The phase transition temperature dependence of different doping ratios was successfully verified.The infrared transmission adjustment rate of 1%doped ratio samples obtained by this method is 43%,the transmittance of visible light is about 40%.It is a kind of solar infrared radiation regulating film with good infrared regulation performance and visible transmittance.