Plasmonic Gradient Effects on High Vacuum Tip-Enhanced Raman Spectroscopy

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	Plasmonic Gradient Effects on High Vacuum Tip-Enhanced Raman Spectroscopy
	Sun, MT ; Zhang, ZL ; Chen, L ; Sheng, SX ; Xu, HX
刊名	ADVANCED OPTICAL MATERIALS
	2014
卷号	2 期号:1 页码:74
ISSN号	2195-1071
通讯作者	Sun, MT (reprint author), Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, POB 603-146, Beijing 100190, Peoples R China.
中文摘要	Experimental evidence is given of the breakdown of Raman selection rules in high vacuum tip-enhanced Raman spectroscopy (HV-TERS), where molecular Raman-active, IR-active, and overtone modes are simultaneously observed in situ, due to the strong tip-enhanced near-field gradient effects. Theoretical calculations firmly support our experimental multipole vibrational observation, and the ratio of the near-field gradient term over electric field term is dependent on both the ratio of. (partial derivative E)beta gamma/partial derivative gamma/E-beta and the ratio of A(alpha beta gamma/alpha alpha beta), which are dependent on the physical structure of TERS and the molecular structure, respectively, in HV-TERS. When the molecule is symmetric along the tip axis, the strongest near-field gradient effect in HV-TERS can be obtained. These experimental findings can promote an understanding of the unexpected "additional Raman peaks" in HV-TERS and provide a promising technique for ultrasensitive molecular spectroscopy.
资助信息	National Natural Science Foundation of China [11374353]; National Basic Research Project of China [2009CB930701]; Program of Shenyang Key Laboratory of Optoelectronic materials and technology [F12-254-1-00]
语种	英语
公开日期	2015-04-14
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/58844]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Sun, MT,Zhang, ZL,Chen, L,et al. Plasmonic Gradient Effects on High Vacuum Tip-Enhanced Raman Spectroscopy[J]. ADVANCED OPTICAL MATERIALS,2014,2(1):74.
APA	Sun, MT,Zhang, ZL,Chen, L,Sheng, SX,&Xu, HX.(2014).Plasmonic Gradient Effects on High Vacuum Tip-Enhanced Raman Spectroscopy.ADVANCED OPTICAL MATERIALS,2(1),74.
MLA	Sun, MT,et al."Plasmonic Gradient Effects on High Vacuum Tip-Enhanced Raman Spectroscopy".ADVANCED OPTICAL MATERIALS 2.1(2014):74.