基于三角晶格光子晶体谐振腔的双通道解波分复用器

提出了一种基于三角晶格二维光子晶体解波分复用器。该器件主体由线缺陷波导、环形谐振腔及点缺陷微腔构成。使用平面波展开法研究了线缺陷波导的特性,给出了线缺陷波导的能带图,对局部器件微调后进行大量的性能仿真以及对整体器件进行性能仿真,选择合适的器件参数,并使用时域有限差分法研究了不同波长的光在解波分复用器中的传输特性,并给出了电场分布图。仿真结果表明,该种结构可以实现波长分别为1271nm和1291nm两种光波的解波分复用。采用6个额外的介质柱,提高了环形腔的透射率;并通过在入射波导的入射口处增加三对介质柱,提高了波导的出射效率,从而整体上提高了双通道解波分复用器的输出效率。

Two-Wavelength Division Demultiplexer Based on Triangular Lattice Photonic Crystal Resonant Cavity

A wavelength-division demultiplexer based on two-dimensional triangular lattice photonic crystals is proposed. This structure is composed of line-defect waveguides, ring resonators and point-defect nanocavities. The characteristics of line-defect waveguide are investigated via the method of the plane-wave expansion, and the projected band diagrams of line-defect waveguide are derived. Then appropriate parameters are obtained after a lot of simulations of the fine tuning of local components and the whole device. The transmission characteristics of light with different wavelengths in the photonic crystals demultiplexer are analyzed via the finite-difference time-domain (FDTD) method, and the resulting electric fields are also given. The results show the ability of wavelength-division demultiplexing between 1271 nm and 1291 nm with this device. Besides, six extra dielectric rods are added to enhance the transmission of the ring cavity, and by adding three pairs of dielectric rods at the entrance port, the total output efficiency of the system is increased.