Research On1-D Photonic Crystal In The Applications Of Middle And Far Infrared

Since first proposed in1987, Photonic crystal (PhC) has received considerable attention for the fundamental physics study as well as various potential applications due to its photonic band gap and photon localization.1-D photonic crystal, compared with2-D and3-D photonic crystals, whose preparation is more simple, goes further study. This paper studied on the1-D photonic crystal in the application of middle and far infrared band. The main work and conclusions are as follows:Firstly this paper studied on what impact the1-D photonic crystal composition parameters has on the photonic band gap and photon localization. The simulation results show that the thickness and the refractive index of the dielectric layer will influence the scope and width of photonic band gap. Then I studied what impact the refractive index, position and thickness of defect layer have on the photon localization. The simulation diagram figures out that the location of the defect mode changes along with the refractive index of defect layer, and two defect modes may appear in the photonic band gap with reasonable choice of defect layer refractive index. The location of the defect layer affects the strength of the defect mode. The thickness of defect layer, like the refractive index of defect layer, has a similar effect on the photon localization.Secondly, I selected Ge and KCl as a high refractive index and a low refractive index material respectively; afterwards I picked Si as a defect layer. The photonic crystal structure achieved the goal of the low reflection at10.6μm and the high reflection at3-5μm and8-14μm. The absorptivity of this structure reached97.15%by introducing an absorption substrate. This pointed out the direction for preparation of1-D photonic crystal to achieve compatible with inhibition of laser reflection and infrared radiation.At last, I designed two experimental schemes to verify the optical properties of the1-D photonic crystals structure. The first experimental scheme can measure the reflection and transmittance of the structure by the standard reflector with relative measurement method. We can observe the application effect of this structure according to the second experimental scheme.In summary, these research and results provide novel idea to design1-D photonic crystal structure and their application of middle and far infrared, and have some reference value to theoretical research on1-D photonic crystal in the application of middle and far infrared.