本文選題：光子晶格　切入點(diǎn)：光子帶隙　出處：《物理學(xué)報(bào)》2017年23期

【摘要】：空間頻率模式的光子帶隙反映了光波在周期性結(jié)構(gòu)中的線性傳輸特性.以這種線性傳輸特性為基礎(chǔ),研究了蜂巢光子晶格中光波的無衍射和反常折射.通過詳細(xì)分析帶隙結(jié)構(gòu)第一通帶上的衍射與折射特性,得出了光波發(fā)生反常衍射和折射的入射條件.匹配不同的入射條件,數(shù)值模擬了光波的無衍射傳輸和反常折射現(xiàn)象.結(jié)果表明:將入射光束的波矢設(shè)置在蜂巢晶格布里淵區(qū)中正常、反常衍射區(qū)的交界處,可使高斯光束沿x軸、y軸方向的衍射得到有效抑制;以多光束干涉場(chǎng)作為入射光場(chǎng),可對(duì)蜂巢晶格進(jìn)行模式匹配,激發(fā)第二布里淵區(qū)的傳輸模式;進(jìn)一步將模式匹配后入射光場(chǎng)的波矢設(shè)置在反常折射區(qū),可實(shí)現(xiàn)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.
【作者單位】： 西北工業(yè)大學(xué)理學(xué)院陜西省光信息技術(shù)重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金(批準(zhǔn)號(hào):61675168,11634010) 國(guó)家自然科學(xué)基金委員會(huì)中國(guó)工程物理研究院聯(lián)合基金(批準(zhǔn)號(hào):U1630125)資助的課題~~
【分類號(hào)】：O734

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本文編號(hào)：1689847