Hybridized plasmon modes and near-field enhancement of metallic nanoparticle-dimer on a mirror

被引：118
作者：
Huang, Yu [1 ]
Ma, Lingwei [1 ]
Hou, Mengjing [1 ]
Li, Jianghao [1 ]
Xie, Zheng [2 ]
Zhang, Zhengjun [3 ]
机构：
[1] Tsinghua Univ, Sch Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China
[2] High Tech Inst Xian, Xian 710025, Shaanxi, Peoples R China
[3] Tsinghua Univ, Sch Mat Sci & Engn, Key Lab Adv Mat MOE, Beijing 100084, Peoples R China
来源：
SCIENTIFIC REPORTS | 2016年 / 6卷
基金：
中国国家自然科学基金;
关键词：
RAMAN-SPECTROSCOPY; GOLD NANOPARTICLE; ELECTROMAGNETIC-FIELDS; OPTICAL-PROPERTIES; HOT-SPOTS; FILM; SCATTERING; SERS; GAP; RESONANCES;
D O I：
10.1038/srep30011
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
For the attractive plasmonic structure consisting of metal nanoparticles (NPs) on a mirror, the coexistence of near-field NP-NP and NP-mirror couplings is numerically studied at normal incidence. By mapping their 3D surface charge distributions directly, we have demonstrated two different kinds of mirror-induced bonding dipole plasmon modes and confirmed the bonding hybridizations of the mirror and the NP-dimer which may offer a much stronger near-field enhancement than that of the isolated NP dimers over a broad wavelength range. Further, it is revealed that the huge near-field enhancement of these two modes exhibit different dependence on the NP-NP and NP-mirror hot spots, while both of their near-field resonance wavelengths can be tuned to the blue exponentially by increasing the NP-NP gaps or the NP-mirror separation. Our results here benifit significantly the fundamental understanding and practical applications of metallic NPs on a mirror in plasmonics.
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页数：9
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