中国物理B ›› 2026, Vol. 35 ›› Issue (2): 27301-027301.doi: 10.1088/1674-1056/ae194d

• • 上一篇    

Strongly modifiable decay and angle-dependent light intensity for an atom near active plasmonic structures: A macroscopic QED study

Ji-Yue Dai(戴吉月), Meng-Dan Zhao(赵梦丹)†, Yu Zhou(周昱)‡, and Jun Xin(忻俊)   

  1. School of Science, Hangzhou Dianzi University, Hangzhou 310018, China
  • 收稿日期:2025-07-20 修回日期:2025-10-28 接受日期:2025-10-30 发布日期:2026-01-21
  • 通讯作者: Meng-Dan Zhao, Yu Zhou E-mail:Zmengdan_2017@163.com;yzhou@hdu.edu.cn
  • 基金资助:
    M. D. Zhao was supported by Hangzhou Dianzi University (Grant No. KYS075621018). J. Xin was supported by the Natural Science Foundation of Zhejiang Province (Grant No. LY24A050004).

Strongly modifiable decay and angle-dependent light intensity for an atom near active plasmonic structures: A macroscopic QED study

Ji-Yue Dai(戴吉月), Meng-Dan Zhao(赵梦丹)†, Yu Zhou(周昱)‡, and Jun Xin(忻俊)   

  1. School of Science, Hangzhou Dianzi University, Hangzhou 310018, China
  • Received:2025-07-20 Revised:2025-10-28 Accepted:2025-10-30 Published:2026-01-21
  • Contact: Meng-Dan Zhao, Yu Zhou E-mail:Zmengdan_2017@163.com;yzhou@hdu.edu.cn
  • Supported by:
    M. D. Zhao was supported by Hangzhou Dianzi University (Grant No. KYS075621018). J. Xin was supported by the Natural Science Foundation of Zhejiang Province (Grant No. LY24A050004).

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摘要： Tunable plasmonic structures provide the possibility to actively modify the radiation from atoms through electromagnetic coupling. In this paper, we investigate the decay and radiation behavior of an atom near a dielectric nanosphere with conductive surface within the framework of macroscopic quantum electrodynamics. The electromagnetic fields including the losses in the materials can be taken as fundamental excitations which interact with the atom through a transition dipole. Both weak and strong coupling regimes have been investigated. The decay rate and the angle-dependent light intensities indeed strongly depend on the parameters of the system, i.e., the position and orientation of the dipole, the geometric size, and the surface conductivity, providing the opportunity of artificial control over these quantities. Generalizing the formalism in this paper to other systems, like metamaterials, is straightforward, which we believe may pave a way for future active quantum nanophotonic devices.

关键词: plasmonics, quantum electrodynamics, light-matter interaction

Abstract: Tunable plasmonic structures provide the possibility to actively modify the radiation from atoms through electromagnetic coupling. In this paper, we investigate the decay and radiation behavior of an atom near a dielectric nanosphere with conductive surface within the framework of macroscopic quantum electrodynamics. The electromagnetic fields including the losses in the materials can be taken as fundamental excitations which interact with the atom through a transition dipole. Both weak and strong coupling regimes have been investigated. The decay rate and the angle-dependent light intensities indeed strongly depend on the parameters of the system, i.e., the position and orientation of the dipole, the geometric size, and the surface conductivity, providing the opportunity of artificial control over these quantities. Generalizing the formalism in this paper to other systems, like metamaterials, is straightforward, which we believe may pave a way for future active quantum nanophotonic devices.

Key words: plasmonics, quantum electrodynamics, light-matter interaction

中图分类号:  (Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))

  • 73.20.Mf
32.50.+d (Fluorescence, phosphorescence (including quenching))