Defect modes of photonic crystal with symmetric double defects

MA Ji; HUANG Zheng-yi; SHEN Xiao-ming; CHEN Xian-feng

doi:10.3969/j.issn.1001-3806.2010.03.032

In order to learn the propagating characteristics of the photonic crystal with symmetnc double defeets,they were studied by means of transfer matrix.It is found that location of defect layers significantly affects the defect mode.If the number of dielectric layers between the two defect layers is greater than the total number of dielectric layers outside the two defect layers,only one single defect mode exists in the band gap and its transmittance reduces rapidly as the difference between the two numbers increases.However,if the number of dielectric layers between the two defect layers is less than the total number of dielectric layers outside the two defect layers,two defect modes with transmittance of 1 exist in band gap and the distance between the two defect modes increases as the difference of the two numbers increases.The spatial electric field distribution of defect mode was also discussed.In order to effectively enhance the electric field in the defect layers,the double defect layers must be close to the center of photonic crystal.

Defect modes of photonic crystal with symmetric double defects

1. School of Physics and Mathematics, Jiangsu Polytechnic University, Changzhou 213164, China

Received Date: 2009-05-14

Accepted Date: 2009-07-10

Available Online: 2010-05-25

Abstract: In order to learn the propagating characteristics of the photonic crystal with symmetnc double defeets,they were studied by means of transfer matrix.It is found that location of defect layers significantly affects the defect mode.If the number of dielectric layers between the two defect layers is greater than the total number of dielectric layers outside the two defect layers,only one single defect mode exists in the band gap and its transmittance reduces rapidly as the difference between the two numbers increases.However,if the number of dielectric layers between the two defect layers is less than the total number of dielectric layers outside the two defect layers,two defect modes with transmittance of 1 exist in band gap and the distance between the two defect modes increases as the difference of the two numbers increases.The spatial electric field distribution of defect mode was also discussed.In order to effectively enhance the electric field in the defect layers,the double defect layers must be close to the center of photonic crystal.

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Reference (12)

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Defect modes of photonic crystal with symmetric double defects

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