摘要
提出直接由MATLAB读入光纤端面图实现复杂结构光子晶体光纤(PCF)模型的快速建立,并综合平面波法(PWM)和频域有限差分(FDFD)法,模拟分析带隙型光子晶体光纤(PBG-PCF)的带隙和模场分布.利用PWM计算得到了在PBG-PCF中传输的光波频率及模式有效折射率范围;基于FDFD法在给定波长及模式有效折射率范围情况下,模拟得到了PBG-PCF中可能存在的模场分布及其他特性.以市售的PBG-PCF为例,验证了数值模拟的正确性,随后系统地分析了结构参数(晶格结构、"原子"占有率、背景材料折射率及"原子"折射率)对光子带隙的影响.这种分析方法及相应分析结果对大带隙PCF的设计和制备研究具有一定的参考价值.
We present a method for quickly setting up the complex structure model of photonic crystal fiber （PCF） through directly reading the cross-section of photonic crystal fiber （PCF） by MATLAB,and numerically analyzing the band-gap and the modal field distribution in band-gap PCF （PBG-PCF） by combining plane wave method （PWM） with finite difference frequency domain （FDFD） method. Firstly,the frequency and modal effective index in PBG-PCF can be calculated by using PWM. Then,the modal field distribution and others properties of the PBG-PCF can be obtained in certain wavelength and index ranges by using the calculation results above and FDFD method. To validate its applicability, a type of commercial PBG-PCF was discussed and the influences of the structure parameters （crystal lattice structure, ＂atom＂filling fraction,background material index and＂atom＂index） on the band-gap were systemically analyzed. This analytic method and calculation results may be useful for the design and preparation of the PCF with large band-gap.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2010年第9期6299-6305,共7页
Acta Physica Sinica
