一维光子晶体微腔的腔模特性

Study of the Resonant Mode Properties of a 1-D Photonic Crystal Microcavity

基于麦克斯韦的电磁场理论,利用传输矩阵法研究了光子晶体微腔的透射特性,并由此得到腔模随入射角的变化规律。研究表明随入射角的增大,TE、TM模的腔模均向高频方向移动,移动规律近乎一致;但是TE腔模的线宽逐渐减小,而TM腔模的线宽则逐渐增大。研究了不同偏振的腔模在光子晶体中的电场分布,随着入射角的增大,TE腔模在微腔中的电场振幅逐渐增大,而TM腔模则逐渐减小。

Based on Maxwell′s electromagnetic theories,the propagating characteristics of the photonic crystal microcavity are studied by the method of transfer matrix,then the relation of resonant mode and incident angle is deduced.It is found the resonant modes of TE and TM polarization shift in the direction of high frequency almost at the same speed,and the line width of TE polarization diminishes with incident angle increasing,but the line width of TM polarization is reverse.The electric field spatial distribution of different polarized resonant modes is also discussed.If the incident angle increases,the electric-field amplitude of TE resonant mode in the microcavity increases,yet that of TM one diminishes.