Surface plasmon enhanced spectroscopies and time and space resolved methods: general discussions
Surface plasmon enhanced spectroscopies and time and space resolved methods: general discussions
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表面等离子体增强光谱和时空解析方法：一般讨论
DOI：
10.1039/c5fd90023a
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发表时间：
2015
影响因子：
3.4
通讯作者：
Masayuki Futamata et al.
中科院分区：
文献类型：
--
作者：
Masayuki Futamata*;Maho Ishikura;Chiaki Iida;Saori Handa;Masayuki Futamata et al.
F. Javier Garc ıa de Abajo opened a general discussion of the two papers by Jeremy Baumberg and Javier Aizpurua: The plasmon frequencies and spatial distributions in sub-nanometer gaps are ultimately sensitive to the speci c atomic structure near that region. It is thus conceivable that a single atom can make a difference in some systems. This is certainly the case in nanographenes, where an atomic defect has been observed to trap UV plasmons. 1 The presence of edge states in this atomically thin material also introduces a strong dependence on the speci c atomic arrangement, 2, 3 and it has been predicted that the removal of a row of atoms is sufficient to strongly scatter IR propagating plasmons. 4 I would anticipate a similar situation in atomically thin rows of noble metal atoms, where plasmons have been neatly observed through electron microscope spectroscopy, 5 and in which the removal of a single atom should prevent hopping between its neighbours. This extreme sensitivity to atomic detail is thus understandable when the system has atomic dimensions (graphene, atomic gold wires), while in gaps involving 3D materials (a gold tip near a gold surface) the situation might be different. The question arises, how does the dimensionality of the system affect the sensitivity of the plasmons to atomic detail? In connection to this, in noble-metal tip–tip or tip–planar-surface gaps, the atomic arrangement involves facets (ie, not just a single atom, but atomic planes, edges and kinks), so is there any dependence on the crystallographic orientation of the metals involved? Electronic surface states are part of this scenario, as their characteristics, and even their existence, depends on the material and orientation of the facets. Would the effect of these states be noticeable on the plasmons? I would appreciate having your opinion on these issues.
