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为使不同频带的电磁波沿着各自的信道传输,在二维介质柱正方格光子晶体中设计了3种典型的信道分路滤波器(CDF)结构。利用时域有限差分法研究了其特性,得到了各个输出端口对应的传输特性曲线。各信道分路输出信号在其通带中心频率处强度最大,随远离中心频率向高频或低频移动各信道输出信号强度将迅速衰减。该类CDF结构各信道分路具有选频性能强,频带中心频率串扰弱,工作波长范围宽等特性,可用作设计窄带带通滤波器、或带阻滤波器等微型器件。因此,在光子晶体片上的光路设计、波分复用光通信系统设计等方面存在潜在的应用价值。
In order to make the electromagnetic waves of different frequency bands transmit along the respective channels, three kinds of typical channel shunt filter (CDF) structures are designed in two-dimensional dielectric column square lattice photonic crystals. The time-domain finite difference method is used to study its characteristics, and the corresponding transmission characteristic curves of each output port are obtained. The output signal of each channel shunt has the maximum intensity at the center frequency of the passband, and the output signal intensity of each channel moves rapidly with the frequency shifted away from the center frequency to the high frequency or the low frequency. The CDF structure of each channel shunt with strong performance of the frequency band center frequency crosstalk weak, wide operating wavelength range and other characteristics, can be used as a narrowband bandpass filter design, or band-stop filter and other micro-devices. Therefore, there are potential applications in the optical design of photonic crystal chips and the design of WDM optical communication systems.