基于二维光子晶体的偏振选择TE/TM波功率分配器  

Polarization Selective Power Splitters for TE and TM Waves Based on Two-Dimensional Photonic Crystals

作　　者：林密[1,2] 邱文标 郗翔 欧阳征标[1,2] 

机构地区：[1]深圳大学电子科学与技术学院,广东深圳518060 [2]深圳市微纳光子信息技术重点实验室,广东深圳518060

出　　处：《光学学报》2016年第12期252-258,共7页Acta Optica Sinica

基　　金：国家自然科学基金(61307048;61275043)

摘　　要：提出了基于二维光子晶体的具有偏振选择功能的横电(TE)和横磁(TM)波三等分功率分配器,功分器结构构建于正方晶格的十字形光子晶体波导中。利用有限元法计算结构的性质,利用Nelder-Mead算法进行了参数优化。结果表明,在输入通道引入不同的偏振选择缺陷,可使功分器具有偏振选择功能。对于TE功分器,TE波能够进入并在其中传输,TM波则不能进入;对于TM功分器,情况则刚好相反。在波导的十字交叉区域引入功率控制缺陷,可使各输出端功率相等。合理选择参数,TE和TM功分器的总传输效率分别可达99.48%和95.53%。波长扫描发现两种功分器都可工作在相对较大的波长范围内。We propose polarization selective three-equal-power splitters for transverse-electric（TE）and transversemagnetic（TM）waves based on two-dimensional photonic crystals.The structures are constructed by square-lattice cross-shaped photonic crystal waveguides.The finite element method and the Nelder-Mead optimization method are used to calculate the properties of the structures and obtain the optimized parameters,respectively.The results show that the power splitters are polarization selective when different polarization-selective defects are set in the input channels.For the TE power splitter,TE waves can enter the splitter and transmit in it,while TM waves cannot enter it;for the TM power splitter,the situation is just reversed.In addition,the power splitters can obtain the identical power output at various ports when power-control defects are set at the cross junction of the waveguides.With optimized parameters,the total transmission efficiency of the TE and TM power splitters can be up to 99.48%and95.53%,respectively.Moreover,it is found by wavelength scanning of the structures that these two splitters can work in a relatively wide wavelength range while keeping good performance.

关 键 词：光学器件 功率分配器 二维光子晶体 光子晶体波导 偏振选择 

分 类 号：TN626[电子电信—电路与系统]