arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1502.05549physics.opticscond-mat.mes-hallphysics.comp-ph
收藏

金属纳米孔阵列中的多极表面等离子体

Multipole surface plasmons in metallic nanohole arrays

Munehiro Nishida, Noriyuki Hatakenaka, Yutaka Kadoya

摘要:

采用严格耦合波分析(RCWA)方法和耦合模方法半解析地分析了金薄膜中纳米孔阵列的准束缚电磁模式。结果表明,当纳米孔尺寸占据大部分晶胞时,薄膜两侧的表面等离子体激元(SPP)与孔的高阶波导模结合产生多极表面等离子体激元:耦合表面等离子体激元模在电场分布上具有多极织构.此外,它揭示了多极织构增强或抑制SPP之间的耦合取决于它们的衍射级,也导致带反转和重建的耦合SPP能带结构。由于准束缚模的多极性质,多个暗模共存,在透射和反射光谱上产生各种Fano共振结构。

英文摘要:

The quasi-bound electromagnetic modes for the arrays of nanoholes perforated in thin gold film are analyzed both numerically by the rigorous coupled wave analysis (RCWA) method and semi-analytically by the coupled mode method. It is shown that when the size of the nanohole occupies large portion of the unit cell, the surface plasmon polaritons (SPPs) at both sides of the film are combined by the higher order waveguide modes of the holes to produce multipole surface plasmons: coupled surface plasmon modes with multipole texture on the electric field distributions. Further, it is revealed that the multipole texture either enhances or suppresses the couplings between SPPs depending on their diffraction orders and also causes band inversion and reconstruction in the coupled SPP band structure. Due to the multipole nature of the quasi-bound modes, multiple dark modes coexist to produce variety of Fano resonance structures on the transmission and reflection spectra.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑