An active metallic nanomatryushka with two similar super-resonances

An active metallic nanomatryushka with two similar super-resonances
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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.
Liu, X. J.
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Wu, D. J.;Cheng, Y.;Wu, X. W.;Liu, X. J.

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从理论上研究了具有增益的简单金属纳米球壳的光学性质。在活性金属纳米材料中,可以在两个临界波长处观察到spaser(表面等离子体激元受激辐射放大)现象。随着中间层增益系数的增加,在ω−+|1模式的活性纳米粒子,然后打破。随着增益系数的进一步增加,在ω−−处发生另一个类似的超共振。|1模式。在ω−+的临界波长处,活性纳米材料的近场增强也被极大地放大了。|1和ω−−| 1模式。进一步发现,在四种壳层中,活性Ag-SiO2-Au壳层中的SPs的放大作用最强,因此近场最大.这种巨大的近场增强可以极大地增强拉曼激发和发射。
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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