Research On The Coherent Thermal Emission Of The One-dimensional Photonic Crystals Including Negative Index Media

Enhancement and controlling the frequency and direction of the thermal emission (improving the coherent thermal emission) are very important in many practical applications, such as the energy conversion and optoelectronics. So far ,A number of structures have been proposed which could generate coherent emission which including grating, multilayer structure consisting of metal or polar material, photonic crystals and metamaterials and so on .Those structures ,as thermal emission sources, exhibit a large emissivity peak within a narrow wavelength band and at a well-defined direction. In this paper, we will use the feature of the photonic crystals (PCs) including negative-index-media (NIM) to generate the coherent thermal emission.Firstly, the basic features of the negative index media summarized from Maxwell-field equations. Based on the transfer matrix, the functions for the transmittance, the reflectance, the transverse field distribution and the dispersion relation of the photonic crystals including NIM are derived. Those will be used in the later of our paper.Finally, three structures to generate coherent thermal emission are designed and calculated. They are the PCs with defect layer, the photonic-quantum-well and the tunneling mode of the PCs respectively. The first two structures used the zero ? ngap of the photonic crystals including NIM, whose coherent thermal emission very weak depending on incident angle, polarizations and scaling of photonic crystals. We also provide the method of double-photonic-quantum-well to enhance the wide of coherent thermal emission.