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首页> 外文期刊>Plasmonics >Enhanced Bragg Reflection in Non-Bravais Superlattice Formed by a Dislocated Teeth-Shaped Plasmonic Waveguide
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Enhanced Bragg Reflection in Non-Bravais Superlattice Formed by a Dislocated Teeth-Shaped Plasmonic Waveguide

机译：牙齿形等离子波导管错位形成的非布拉瓦超晶格中的增强布拉格反射

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摘要

A periodically teeth-shaped surface plasmonic waveguide with dislocation is theoretically investigated. We propose an equivalent solvable model, a four-section non-Bravais lattice with infinite length to describe the dislocated structure. Based on the Bloch theorem, the band gap and Bragg condition of non-Bravais lattice are both derived, and the effect of dislocation on Bragg reflection is discussed. The analysis indicates that the dislocation has a remarkable effect on the distribution of band gaps and gap width and can cause an enhancement of odd-order or even-order Bragg reflection at different filling factors. In addition, the Bragg wavelength can be linearly adjusted by the dislocation. The transmission spectra of a finite-period plasmonic waveguide are studied via both transfer matrix method and numerical simulation at last. The calculation results present two cases for the enhancement of the first-order and the second-order Bragg reflections with different geometric parameters, respectively. The simulation results verify the enhanced Bragg reflection with the increase of dislocation and are well matched with our theoretical analysis.
机译：理论上研究了具有位错的周期性齿状表面等离子体激元波导。我们提出了一个等效的可解模型，即具有无限长度的四部分非布氏晶格来描述位错结构。基于Bloch定理，推导了非Bravais晶格的带隙和Bragg条件，并讨论了位错对Bragg反射的影响。分析表明，位错对带隙的分布和带隙宽度有显着影响，并且在不同填充因子下会引起奇数或偶数布拉格反射的增强。另外，布拉格波长可以通过位错线性地调节。最后通过传递矩阵法和数值模拟研究了有限周期等离子体波导的传输谱。计算结果分别给出了两种提高几何参数不同的一阶和二阶布拉格反射的方法。仿真结果证明，随着位错的增加，布拉格反射增强，并且与我们的理论分析非常吻合。

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