基于磁性光子晶体的多端口环行器设计

Multiport Circulators Design Based on Magneto-Photonic Crystals

摘要:

基于二维三角晶格和正方晶格光子晶体分别设计了六端口和八端口光子晶体环行器。环行器由硅介质柱光子晶体波导和铁氧体介质柱缺陷构成。所设计的六端口环行器每个波导连接处只有一个铁氧体材料,能够有效降低损耗；八端口环行器波导连接处添加了多个铁氧体材料可有效提高隔离度。使用有限元法对电磁波在环行器中的传输进行了仿真验证。计算结果表明,六端口环行器各端口的隔离度达到22~38dB；八端口环行器各端口的隔离度达到21.7~40.5dB。设计的多端口环行器具有结构简单紧凑、隔离度高、损耗低的优点。

Abstract:

Photonic crystal circulators with the structure of six-port and eight-port were designed based on two-dimensional triangular lattice and square lattice photonic crystals, respectively. The circulators consist of a photonic crystal waveguide composed of silicon rods and ferrite dielectric rods defects. The designed six-port circulator has only one ferrite rod at each waveguide junction, which can effectively reduce the loss; the eight-port circulator has multiple ferrite rods added at the waveguide junctions to effectively improve the isolation. The transmission of electromagnetic waves in the circulator is simulated and verified by using the finite element method. The results show that the isolation of the six-port circulator is 22~38dB, and the isolation of the eight-port circulator is 21.7~40.5dB. The designed multi-port circulators have the advantages of simple and compact structure, high isolation and low loss.