蜂巢光子晶格中光波的无衍射和反常折射

发布时间：2018-03-31 08:02

本文选题：光子晶格　切入点：光子带隙　出处：《物理学报》2017年23期

【摘要】：空间频率模式的光子带隙反映了光波在周期性结构中的线性传输特性.以这种线性传输特性为基础,研究了蜂巢光子晶格中光波的无衍射和反常折射.通过详细分析带隙结构第一通带上的衍射与折射特性,得出了光波发生反常衍射和折射的入射条件.匹配不同的入射条件,数值模拟了光波的无衍射传输和反常折射现象.结果表明:将入射光束的波矢设置在蜂巢晶格布里渊区中正常、反常衍射区的交界处,可使高斯光束沿x轴、y轴方向的衍射得到有效抑制;以多光束干涉场作为入射光场,可对蜂巢晶格进行模式匹配,激发第二布里渊区的传输模式;进一步将模式匹配后入射光场的波矢设置在反常折射区,可实现光波的反常折射.
[Abstract]:The photonic band gap in spatial frequency mode reflects the linear propagation characteristics of light waves in periodic structures. The non diffraction and anomalous refraction of light waves in the honeycomb photonic lattice are studied. By analyzing the diffraction and refraction characteristics of the first pass band of the band gap structure in detail, the incident conditions of the anomalous diffraction and refraction of the light waves are obtained. The non-diffraction propagation and anomalous refraction of the light wave are numerically simulated. The results show that the wave vector of the incident beam is located at the junction of the anomalous diffraction region in the Brillouin region of the honeycomb lattice. The diffraction of Gao Si beam along the x axis and y axis can be effectively suppressed, and the mode matching of the honeycomb lattice can be carried out by using the multi-beam interference field as the incident light field, and the propagation mode of the second Brillouin region can be excited. Furthermore, the wave vector of the incident light field after mode matching is set in the anomalous refraction region, which can realize the anomalous refraction of the light wave.
【作者单位】：西北工业大学理学院陕西省光信息技术重点实验室;
【基金】：国家自然科学基金(批准号:61675168,11634010) 国家自然科学基金委员会中国工程物理研究院联合基金(批准号:U1630125)资助的课题~~
【分类号】：O734

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