An active metallic nanomatryushka with two similar super-resonances
An active metallic nanomatryushka with two similar super-resonances
复制标题
具有两种相似超共振的活性金属纳米马特里什卡
DOI:
10.1063/1.4886696
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发表时间:
2014-07
影响因子:
3.2
通讯作者:
Liu, X. J.
中科院分区:
文献类型:
--
作者:
Wu, D. J.;Cheng, Y.;Wu, X. W.;Liu, X. J.
The optical properties of a simple metallic nanomatryushka (nanosphere-in-a-nanoshell) with gain have been investigated theoretically. The spaser (surface plasmon amplification by stimulated emission of radiation) phenomena can be observed at two critical wavelengths in the active metallic nanomatryushkas. With increasing the gain coefficient of the middle layer, a similar super surface plasmon (SP) resonance is first found at the ω−+|1 mode of the active nanoparticles and then breaks down. With further increasing the gain coefficient, another similar super-resonance occurs at the ω−−|1 mode. The near-field enhancements in the active nanomatryushkas also have been greatly amplified at the critical wavelengths for ω−+|1 and ω−−|1 modes. It is further found that the amplifications of SPs in the active Ag–SiO2–Au nanoshell are strongest in four kinds of nanoshells and hence the largest near fields. The giant near-field enhancement can greatly enhance the Raman excitation and emission.
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