Effect of absorption of dopant on design of photonic crystal filters
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摘要: 为了研究杂质的吸收对光子晶体滤波器设计的影响,引入复折射率并利用特征矩阵法,计算了滤波透射峰的峰值和半峰全宽。滤波透射峰的峰值随杂质的消光系数增加而迅速减小,滤波通道透射峰的半峰全宽随消光系数增加而增大,滤波透射峰的峰值和半峰全宽都随吸收杂质的光学厚度的增加而减小。结果表明,设计光子晶体滤波器时,必须考虑杂质吸收这一重要因素,应选择消光系数小于0.002的掺杂材料,并且杂质的光学厚度应设计在2(λ0/4)左右。Abstract: In order to study the effect of dopant absorption on photonic crystal filters,the peak transmissivity and full width at half maxmum(FWHM) of the filters were calculated based on the complex refractive index and the characteristic matrix.It was found that the peak transmissivity decreased with the increment of the extinction coefficient,however the FWHM increased with the increment of the extinction coefficient.Both the peak transmissivity and the FWHM decreased with the increment of the optical thickness of doping.A valuable conclusion is drawn that the absorption of dopant has to be taken into account for the design of a phonic crystal filter and that the extinction coefficient should be less than 0.002 and the optical thickness of doping should be 2(λ0/4) or so.
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Keywords:
- materials /
- photonic crystal /
- filter /
- defect mode /
- extinction coefficient
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