| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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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 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 |
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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.
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Received: 14 October 2016
Revised: 05 February 2017
Accepted manuscript online:
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PACS:
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78.67.-n
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(Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)
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42.70.-a
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(Optical materials)
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42.25.Fx
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(Diffraction and scattering)
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52.38.-r
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(Laser-plasma interactions)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11174222 and 91230203). |
Corresponding Authors:
Zhi-Guo Wang
E-mail: zgwang@tongji.edu.cn
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Cite this article:
Chang-Yu Liu(刘昌宇), Ya-Ming Xie(解亚明), Zhi-Guo Wang(王治国) Super scattering phenomenon in active spherical nanoparticles 2017 Chin. Phys. B 26 067803
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