中国物理B ›› 2017, Vol. 26 ›› Issue (6): 67803-067803.doi: 10.1088/1674-1056/26/6/067803

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Super scattering phenomenon in active spherical nanoparticles

Chang-Yu Liu(刘昌宇), Ya-Ming Xie(解亚明), Zhi-Guo Wang(王治国)   

  1. 1 School of Physics Science and Engineering, Tongji University, Shanghai 200092, China;
    2 Beijing Computational Science Research Center, Beijing 100193, China;
    3 Department of Physics, University of Science and Technology of China, Hefei 230026, China
  • 收稿日期:2016-10-14 修回日期:2017-02-05 出版日期:2017-06-05 发布日期:2017-06-05
  • 通讯作者: Zhi-Guo Wang E-mail:zgwang@tongji.edu.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11174222 and 91230203).

Super scattering phenomenon in active spherical nanoparticles

Chang-Yu Liu(刘昌宇)1, Ya-Ming Xie(解亚明)2,3, Zhi-Guo Wang(王治国)1   

  1. 1 School of Physics Science and Engineering, Tongji University, Shanghai 200092, China;
    2 Beijing Computational Science Research Center, Beijing 100193, China;
    3 Department of Physics, University of Science and Technology of China, Hefei 230026, China
  • Received:2016-10-14 Revised:2017-02-05 Online:2017-06-05 Published:2017-06-05
  • Contact: Zhi-Guo Wang E-mail:zgwang@tongji.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11174222 and 91230203).

摘要:

Localized surface electromagnetic resonances in spherical nanoparticles with gain are investigated by using the Mie theory. Due to the coupling between the gain and resonances, super scattering phenomenon is raised and the total scattering efficiency is increased by over six orders of magnitude. The dual frequency resonance induced by the electric dipole term of the particle is observed. The distributions of electromagnetic field and the Poynting vector around nanoparticles are provided for better understanding different multipole resonances. Finally, the scattering properties of active spherical nanoparticles are investigated when the sizes of nanoparticles are beyond the quasi-static limit. It is noticed that more high-order multipole resonances can be excited with the increase of the radius. Besides, all resonances dominated by multipole magnetic terms can only appear in dielectric materials.

关键词: super scattering, gain, plasmonic resonance, Mie theory

Abstract:

Localized surface electromagnetic resonances in spherical nanoparticles with gain are investigated by using the Mie theory. Due to the coupling between the gain and resonances, super scattering phenomenon is raised and the total scattering efficiency is increased by over six orders of magnitude. The dual frequency resonance induced by the electric dipole term of the particle is observed. The distributions of electromagnetic field and the Poynting vector around nanoparticles are provided for better understanding different multipole resonances. Finally, the scattering properties of active spherical nanoparticles are investigated when the sizes of nanoparticles are beyond the quasi-static limit. It is noticed that more high-order multipole resonances can be excited with the increase of the radius. Besides, all resonances dominated by multipole magnetic terms can only appear in dielectric materials.

Key words: super scattering, gain, plasmonic resonance, Mie theory

中图分类号:  (Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)

  • 78.67.-n
42.70.-a (Optical materials) 42.25.Fx (Diffraction and scattering) 52.38.-r (Laser-plasma interactions)