Bandgap Characteristics Of Plasma Photonic Cystal

Today,with the rapid development of information technology,integrated circuits based on transistors are widely used in the field of communications.A large number of microelectronic technologies such as waveguide,filter,antenna and other semiconductor integrated systems have become dominant in the current network age.However,with the rapid development of communication technology,microelectronics integration technology has encountered bottlenecks,and its inherent characteristics such as high heat generation and correspondingly slow behavior have been unable to meet the requirements of high-speed communication.Therefore,people hope to find a more efficient and fast new communication material as a substitute for semiconductor integrated communication.Photonic crystals,as a new type of material for controlling electromagnetic wave transmission,have attracted widespread attention from scholars at home and abroad in recent years for their superior properties and broad application prospects.At present,it is an important research topic in the field of photonic crystals to make photonic crystals with adjustable structural parameters,especially to obtain reconfigurable and controllable photonic band gaps.In view of the above research status,we use COMSOL multiphysics-based coupling software based on the finite element method to analyze the dispersion characteristics of the plasma photonic crystal The main contents are as follows:First,the theoretical and experimental development of plasma photonic crystals is summarized.Theoretically,the common solution methods,basic principles and research progress of the dispersion relationship of plasma photonic crystals are clarified.In the experiments,several methods of generating plasma photonic crystals,diagnostic methods of band structure are analyzed,and the breakthroughs in experimental research of plasma photonic crystals in recent years are discussed.Secondly,for one-dimensional plasma photonic crystals,the effects of electron density,geometric parameters?plasma column radius r,plasma column spacing L?and the dielectric constant of the dielectric layer around the plasma column on its energy band characteristics were studied.The results show that as the electron density increases,the photon forbidden band moves toward high frequencies,and at the same time,the attenuation effect on electromagnetic waves increases.As the plasma column radius r increases,the intensity of the forbidden band attenuation of the plasma photonic crystal increases,while the forbidden band moves to higher frequencies;as the lattice constant increases,the forbidden band attenuation effect are weakened,and the forbidden band position moves to lower frequencies,while the number of forbidden bands are increased.Therefore,the structure parameters of the plasma optical crystal have an important influence on its band structure,and can be used as an important tuning means to achieve control of electromagnetic waves of different frequencies.Third,for two-dimensional plasma photonic crystals,the effects of different parameters,such as lattice symmetry,electron density,plasma filling ratio,and cross-sectional shape of the plasma column,on the band characteristics are analyzed.The results show that the cut-off frequency and the band position of the plasma photonic crystal move toward the high-frequency direction as the electron density increases.With the increase of the filling ratio,the bandgap width and the center frequency of the triangular lattice plasma photonic crystal move toward the high frequency,and increase slowly when the filling is relatively small,and the bandgap width increases significantly faster when the filling is relatively large.In addition,the influence of the cross-sectional area of rectangular and elliptical plasma columns with different shapes on the tetragonal lattice plasma photonic crystal was analyzed.The research shows that as the elliptical plasma proportion f₁ and rectangular plasma proportion f₂ increase,the cut-off frequency moves toward the high-frequency direction and the width and center frequency of the forbidden band also increase.The band gap width of the quadrangular plasma changes the most.Furthermore,the formation mechanism of flat bands in photonic band gaps based on plasmon and TE mode polarization is introduced.The results show that the horizontal band gap is attributed to the special property of the plasmon.Its formation is a special property manifested by the interaction of plasma and electromagnetic waves.The electromagnetic field in the flat band is uniformly distributed around the plasma column.Finally,the studies of plasma photonic crystals in this paper issummarized,and the shortcomings of existing research methods and future development trends are analyzed and prospected.The research results are of great significance for understanding the band characteristics of plasma photonic crystals and their applications in electromagnetic wave control devices.At the same time,it has some implications for the realization of tunable photonic crystals in other systems.