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A new mechanism of intersection formed by two line defect photonic crystal (PC) waveguides are numerically investigated using the finite-diFference time-domain method. The results show that the normalized crosstalk is smaller than 10^-4; the reflection is smaller than 10^-3, and the transmission is larger than 0.999. The authors analyse the physical origins and find that a modified self-imaging process in the intersected multi-mode region is the main reason of the excellent performance. This kind of multi-mode interference based intersection may find potential applications in PC optical circuits. 相似文献
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二维光子晶体耦合腔的多模双稳态光开关 总被引:2,自引:1,他引:1
利用时域有限差分数值模拟方法和耦合模理论分析方法,研究了Kerr型非线性二维光子晶体耦合腔结构中的光学双稳态开关。利用耦合模理论,分析了耦合腔结构的多模特性,以及对应本征态的局域强度分布特性,并讨论了在耦合腔结构中实现多模光学双稳态开关的原理。发现在二维耦合腔结构中,可以实现信号自泵浦和泵浦-信号两种类型的双稳态开关,且后者具有使泵浦和信号在频率和空间相分离的优点。利用非线性时域有限差分数值模拟方法,得到了高斯脉冲激励下的双稳态响应曲线。 相似文献
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Broadband Frequency Down-Conversion Using Coupled Cavity Structures in One-Dimensional Photonic Crystals
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The frequency down-conversion of one-dimensional photonic crystals with the coupled cavity structure is investigated by the nonlinear finite-difference time-domain method. The efficient frequency conversion is obtained by utilizing the advantages of the broad eigenfrequency band, the strong localization and the Bloch phase matching of the coupled cavity structure. More importantly, the signal frequency could be tuned continuously within the whole band of the coupled cavity structure (with a bandwidth to central frequency ratio of 5.4%), and the gains are homogeneous in the band. 相似文献
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