中文摘要：

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。

英文摘要：

In order to make different frequency bands propagate along their own channels, three typical structures of channel drop filter （CDF） are designed in a 2-dimension dielectric rod square photonic crystal structure. Their performance characteristics are investigated by the finite-difference time-domain method, and transmission efficiency graphs of the their output ports are obtained. The maximal transmission power ratio of every channel is at a central frequency of pass-band, and the power ratios will decay swiftly when the frequency shifts towards higher or lower than the central one. These structures of CDF have the characteristics of excellent frequency selectivity, weak crosstalk among central frequencies of different bands, broad operating wavelength ranges, etc. They can be used to design micro devices such as narrow band-pass filter or band-stop filter. Therefore, the CDF has important application value in the design of optical path on a photonic crystal chip and wavelength division multiplexed optical communication systems, etc.