Detection of invisible phonon modes in individual defect-free carbon nanotubes by gradient-field Raman scattering

We provide an effective method to investigate the field gradient effect in nanoconfined plasmon-matter interaction.Aligned ultralong SWNTs without defects were grown on marked substrates, followed by assembling gold nanoparticle clusters around individual nanotubes. The Raman scattering behavior of...

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Published inChinese physics B Vol. 26; no. 7; pp. 474 - 479
Main Author 杨丰 纪英露 张霄 范庆霞 张楠 谷孝刚 肖卓建 张强 王艳春 吴晓春 李俊杰 周维亚
Format Journal Article
LanguageEnglish
Published 01.06.2017
Subjects
单壁碳纳米管
原子尺度
声子模
拉曼散射
探测
无缺陷
梯度场
等离子体
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ISSN1674-1056
2058-3834
DOI10.1088/1674-1056/26/7/078801

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Summary:We provide an effective method to investigate the field gradient effect in nanoconfined plasmon-matter interaction.Aligned ultralong SWNTs without defects were grown on marked substrates, followed by assembling gold nanoparticle clusters around individual nanotubes. The Raman scattering behavior of a nanotube placed in an atomic scale nanogap between adjacent nanoparticles was studied. In addition to the expected plasmon-induced Raman enhancement up to 103,the defect-free D-mode of an individual SWNT induced by gradient field is found for the first time. When the light is confined at atomic scale, gradient field Raman scattering becomes significant and dipole-forbidden phonon modes can be activated by quadrupole Raman tensor variation, indicating breakdown of the Raman selection rules.
Bibliography:We provide an effective method to investigate the field gradient effect in nanoconfined plasmon-matter interaction.Aligned ultralong SWNTs without defects were grown on marked substrates, followed by assembling gold nanoparticle clusters around individual nanotubes. The Raman scattering behavior of a nanotube placed in an atomic scale nanogap between adjacent nanoparticles was studied. In addition to the expected plasmon-induced Raman enhancement up to 103,the defect-free D-mode of an individual SWNT induced by gradient field is found for the first time. When the light is confined at atomic scale, gradient field Raman scattering becomes significant and dipole-forbidden phonon modes can be activated by quadrupole Raman tensor variation, indicating breakdown of the Raman selection rules.
carbon nanotube; Raman scattering; electromagnetic field gradient; selection rule
Feng Yang1,3,4,Yinglu Ji2,Xiao Zhang1,4,Qingxia Fan1,4,Nan Zhang1,4,Xiaogang Gu1,3,4,Zhuojian Xiao1,3,4,Qiang Zhang1,4,Yanchun Wang1,3,Xiaochun Wu2,4,Junjie Li1,Weiya Zhou1,3,4（ 1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China ; 2National Center for Nanoscience and Technology, Beijing 100190, China ; 3 Beijing Key Laboratory for Advanced Functional Materials and Structure Research, Beijing 100190, China ; 4 University of Chinese Academy of Sciences, Beijing 100049, China）
11-5639/O4
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/26/7/078801