入射光频率变化对负折射现象的影响  

Dependence of Negative Refraction Phenomenon on Incident Light Frequency

作　　者：冯莉[1] 梁斌明[1] 李卓[1] 陈家璧[1] 庄松林[1] 

机构地区：[1]上海理工大学光学与电子信息工程学院,上海200093

出　　处：《激光与光电子学进展》2008年第3期61-65,共5页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(60478045);上海市教委优秀青年基金(04dz05110)资助课题

摘　　要：以硅的圆形介质柱在空气中组成二维六边形排列结构的光子晶体为例,研究了入射光频率变化对光子晶体负折射现象的影响。利用时域有限差分法(FDTD)并通过模拟仿真给出了两者之间的规律,同一光子晶体中,在可产生较明显负折射现象的入射光频率范围内,折射光的偏转角度随入射光频率的增大而减小;随着入射光归一化频率逐渐变小,增加光子晶体的波导宽度可产生较明显负折射现象。要得到折射率为-1的情况,则入射光归一化频率越小,光子晶体的波导宽度要相应越大。The photonic crystals of hexagonal structure with silicon circle rods are taken as examples to illuminate the dependence of negative refractive phenomenon on incident light frequency in two-dimensional photonic crystals. Simulation with finite-difference time-domain （FDTD） method shows the effect of incident light frequency on the negative refractive phenomenon. Along with the accretion of the incident light frequency in the frequency range where nagative refraction exists for the same photonic crystal, the deflection angle of the transmitted light will decrease; with the accretion of incident light frequency, enlarging the waveguide width can induce evident negative refraction phenomenon. To obtain refractive index of-1 decreasing the incident light frequency and enlarging the waveguide width are both necessary.

关 键 词：负折射率 光子晶体 入射光频率 时域有限差分法 

分 类 号：O441[理学—电磁学]