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arXiv 1609.05804physics.opticscond-mat.mes-hall
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控制超材料中的环形激励实现高Q响应

Controlling the toroidal excitations in metamaterials for high-Q response

Yuancheng Fan, Fuli Zhang, Quanhong Fu, Zeyong Wei, Hongqiang Li

摘要:

研究了超材料中环形多极子的激发对亚波长高Q响应的影响。在这项研究中,我们探讨了优化的环形激励在平面超材料组成的非对称开口环谐振器(ASRRs)。研究发现,通过调整自激谐振腔的特征参数:非对称因子,可以显著增强环形偶极子的散射功率。有趣的是,在环形激发的改善伴随着对环形超材料的Q-因子的增量;它示出了,通过改变ASRR的不对称因子,环形偶极子的散射功率和Q-因子都增加了一个以上的顺序。环形多极子激发的优化提供了进一步提高超材料的Q因子并在亚波长尺度上增强光-物质相互作用的机会,用于低功率非线性处理和敏感光子应用中的潜在应用。

英文摘要:

The excitation of toroidal multipoles in metamaterials was investigated for high-Q response at a subwavelength scale. In this study, we explored the optimization of toroidal excitations in a planar metamaterial comprised of asymmetric split ring resonators (ASRRs). It was found that the scattering power of toroidal dipole can be remarkably strengthened by adjusting the characteristic parameter of ASRRs: asymmetric factor. Interestingly, the improvement in toroidal excitation accompanies increment on the Q-factor of the toroidal metamaterial; it is shown that both the scattering power of toroidal dipole and the Q-factor were increased more than one order by changing the asymmetric factor of ASRRs. The optimization in excitation of toroidal multipole provide opportunity to further increase the Q-factor of metamaterial and boost light-matter interactions at the subwavelength scale for potential applications in low-power nonlinear processing, and sensitive photonic applications.

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