Journal of Jishou University(Natural Sciences Edition) ›› 2022, Vol. 43 ›› Issue (2): 38-44.DOI: 10.13438/j.cnki.jdzk.2022.02.007

• Wireless Eectronics and Automation • Previous Articles     Next Articles

Design of Filter and Beam Aplitting Device Based on Photonic Crystal Ring Cavity

WU Cong,SUN Jing,SU Muyang,ZHONG Liang   

  1. (College of Physics and Electromechanical Engineering,Jishou University,Jishou 416000,Hunan China)
  • Online:2022-03-25 Published:2022-07-14

Abstract: Based on the resonance coupling principle of photonic crystal ring cavity and waveguide,a  three-port photonic crystal dual-function device with two-dimensional triangular lattice was designed,which was composed of ring defect and line defect.The plane wave expansion method and the finite difference time domain method were used to analyze the transmission characteristics of optical wave in the device,and thus  the transmission characteristic curve and the light field distribution were obtained.Then the influence of the number and density of the central dielectric column on the transmission efficiency of the output port was discussed.The results show that the frequency can be selected by adjusting the number of central dielectric columns.When the number of medium column was 5,the device achieved the filtering function of 1.346 μm,1.455 μm and beam splitting function of 1.414 μm.According to the influence of the horizontal and vertical spacing of the central column on the transmittance,the optimal structure parameters of the device was obtained,and the transmittance of the filter wavelength and beam splitting wavelength of the device are calculated.

Key words: photonic crystal, triangular lattice, ring resonator, central dielectric column

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