Researches On Reflective Dispersion Management Device Based On Photonic Band-gap Of Artificial Microstructure

In recent years,researchers have done a lot of research work in artificial microstructure material which is applied to the control of optical transmission.Especially in photonic crystals with photonic bandgap properties of periodic artificial microstructure,the theoretical and experimental research show that dispersion characteristics can be achieved on the compression and broadening of pulse.From the existing literature reports,their study is focused on dispersion characteristics based on conduction band of photonic crystals,namely transmission type devices,such as photonic crystals,photonic crystal waveguide and so on.Impedance mismatch often leads to the output pulse spectrum amplitude modulation,and seriously affect the chirp pulse compression effect.According to the above situation,this paper is presented based on the artificial microstructure of photonic bandgap reflective dispersion device research to make up for the shortcoming of transmission type broadband dispersion device.The mainly work is as follows:First,for different structures of two-dimensional photonic crystals,such as simple 2D square lattice and triangular lattice photonic crystal,we analyzed the second order and third order phase of the reflected wave based on photonic band-gap in the different modes(TM mode and TE mode);second,we researched surface modification(end truncation and change the cylinder radius)for the second and third order phase regulation;finally,the study found that the second order and third order phase quantitative is smaller in the forbidden band.But we can adjust the second order and third order phase numerical size and symbols through surface modification.Second,we put forward and designed a kind of reflection type chirp pulse compression based on photonic band gap.We use the FDTD numerical simulation of the chirped pulse multiple reflections between two pieces of the same photonic crystal,and found the pulse peak power in increased significantly,the time domain pulse width was compressed.With increase of number of reflection,the second order dispersion caused by the compensation becomes more and more small.Third order phase performance is more and more prominent,trailing pulse is more and more obvious,pulse peak power decline.