Reconfigurable Photonic Crystal Device Based On Phase Change Medium Integration

Photonic crystals,as a unique periodic arrangement of artificial materials,have attracted much attention due to their excellent optical properties.They are especially widely used in sensors,optical communications,integrated optoelectronics and other fields.However,most photonic crystal devices can only realize passive electromagnetic regulation,lacking a dynamic regulation mechanism,and are restricted in many fields.Therefore,the realization of active light regulation based on photonic crystal platform has become a research hotspot.In this paper,the realization method and design idea of dynamic active regulation photonic device are explored for visible light band to near infrared band.The main research contents include:1.In this paper,a reconfigurable photonic crystal model based on phase change is established,and the dynamic switching or switching control of spectral response is realized through the one-dimensional(1D)photonic crystal(PC)architecture integrated with the phase change material of germanium antimony telluride(GST).In a one-dimensional PC device composed of alternating SIN and GST nanofilms,the active and precise adjustment of passband and central resonant frequencies can be realized.An approximate analytical model is derived based on the alternating medium model to interpret the spectral characteristics,including band gaps and resonant frequencies.Both the measured and calculated results confirm that the minimum(or maximum)of passband and resonance have obvious red shifts before and after phase transition,which well confirms the theoretical prediction.2.In this paper,a model of a phase-change photonic crystal dynamic electromagnetic control device based on the defect mode is established.The phase-change material Ge Sb Te(GST)is used as the defect layer of the one-dimensional photonic crystal,embedded in two symmetrical alternating dielectric structures(Ge:Si N)~N(GST)(Si N:Ge)~N,reconfigurable or dynamic frequency selection characteristics are realized.In this one-dimensional defect photonic crystal(DPC),the dynamic and precise adjustment of the defect mode is demonstrated.And deduced an analytical model to illustrate the characteristics of adjustable frequency spectrum.Both the simulation results and the calculation results show the emergence of defects,which well verify the theoretical prediction.