Regulation of multiple exceptional points in a plasmonic quadrumer

被引:3
|
作者
Peng, Yiwei [1 ,2 ]
Yang, Yumeng [1 ,2 ]
Chen, Hongsheng [1 ,2 ,3 ,4 ]
Li, Yuanzhen [1 ,2 ]
Gao, Fei [1 ,2 ]
机构
[1] Zhejiang Univ, Interdisciplinary Ctr Quantum Informat, ZJU Hangzhou Global Sci & Technol Innovat Ctr, State Key Lab Extreme Photon & Instrumentat, Hangzhou 310027, Peoples R China
[2] Zhejiang Univ, Int Joint Innovat Ctr, Electromagnet Acad, Haining 314400, Peoples R China
[3] Zhejiang Univ, Jinhua Inst, Key Lab Adv Micro Nano Elect Devices & Smart Syst, Jinhua 321099, Peoples R China
[4] Zhejiang Univ, Shaoxing Inst, Shaoxing 312000, Peoples R China
来源
OPTICAL MATERIALS EXPRESS | 2024年 / 14卷 / 06期
基金
中国国家自然科学基金;
关键词
Electromagnetic fields;
D O I
10.1364/OME.522439
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Exceptional points (EPs), which signify the singularity of eigenvalues and eigenstates in non-Hermitian systems, have garnered considerable attention in two-state systems, revealing a wealth of intriguing phenomena. However, the potential of EPs in multi-state systems, particularly their interaction and coalescence, has been underexplored, especially in the context of electromagnetic fields where far-field coupling can revolutionize spatial wave control. Here, we theoretically and computationally explore the coalescence of multiple EPs within a designer surface plasmonic quadrumer system. The coupled mode model shows that the multiple EPs can emerge and collide as the system parameters vary, leading to higher-order singularities. Numerically calculated results showcase that multiple EPs with different orders have special far-field responses. This pioneering strategy heralds a new era of wavefront engineering in non-Hermitian photonic structures, presenting a transformative class of radiative systems that transcend the conventional frequency spectrum from microwave to optical realms.
引用
收藏
页码:1475 / 1483
页数:9
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