基于光子晶体谐振腔优越的选频特性,设计了一种八波长光子晶体波分复用器。利用平面波展开法得到了特定晶格排列和半径下光子晶体的能带结构,采用时域有限差分法分析了微腔耦合频率的变化规律,得出环形谐振器和微腔之间的共振耦合特性。该器件主要由4个光子晶体环形腔和8个尺寸不同的微腔组成,实现了1.37,1.39,1.42,1.44,1.50,1.51,1.53,1.55 μm等8个波长的波分解复用。结果表明,只通过调节微腔中心柱和外围介质柱的半径,就可以使8个波长从特定端口输出,且输出效率都可以达到97%以上。所设计的器件尺寸为23 μm×18 μm,具有物理尺寸小、耦合效率高等优点,在集成光学领域具有潜在的应用前景。

In the present paper, we study the transmission of the two-dimensional photonic crystal (PC) superellipse ring resonator. The fast growing applications of optomechanical systems lead to strong demands in new sensing mechanism in order to design the sensing elements to nanometer scale. The photonic crystal based resonator has been investigated as promising solutions because the band gap structure and resonator characteristics are extremely sensitive to the deformation and position shift of rod / cavity in PC resonators. This structure opens a single channel filter. The study is extended for tuning of channel filter’s wavelength with a temperature of this structure. The transmission of the channel filter shows a red shift with temperature linearly. This wavelength shift of the channel filter is used for the sensor application. The sensitivity for the proposed structure is found to be 65.3 pm/℃. The outstanding sensing capability renders PC resonators as a promising optomechanical sensing element to be integrated into various transducers for temperature sensing applications.