For all three kinds of three-dimensional photonic crystal structures, their band gap width and band gap ratio can be improved with the increase of dielectric constant ratio.
对于不同的三维光子晶体结构，随着介电常数比的增大，完全禁带的宽度和带隙率也会随着增大。
The larger the ratio of refraction index, the more obvious is the band gap.
折射率的比值越大，则禁带越明显。
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