Super scattering phenomenon in active spherical nanoparticles |
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| Affiliation: | 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 highorder 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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| Keywords: | super scattering gain plasmonic resonance Mie theory |
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