Intensity enhancement of vibrational sum frequency generation by gap-mode plasmon resonance

被引:5
|
作者
Okuno, Masanari [1 ]
Tokimoto, Taichi [1 ]
Eguchi, Miharu [1 ]
Kano, Hideaki [2 ]
Ishibashi, Taka-aki [1 ]
机构
[1] Univ Tsukuba, Grad Sch Pure & Appl Sci, Dept Chem, Tsukuba, Ibaraki 3058571, Japan
[2] Univ Tsukuba, Grad Sch Pure & Appl Sci, Dept Appl Phys, Tsukuba, Ibaraki 3058571, Japan
关键词
RAMAN-SCATTERING; SURFACE; SPECTROSCOPY; ABSORPTION; PYRIDINE; SPECTRA; SPHERE;
D O I
10.1016/j.cplett.2015.08.067
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A metal sphere-plane structure consisting of gold nanoparticles, p-methylbenzenethiol and a gold substrate was measured by vibrational sum frequency generation spectroscopy with four excitation wavelengths, 630, 680, 720, and 780 nm. The enhancement factors of Raman signals were estimated to be 250 and 104 for the 532 and 647 nm excitation. Contrastingly, we found that the enhancements of VSFG signals were much smaller, a factor of 5 at maximum. We speculate that the small enhancement factor of VSFG signals is due to the coherent nature of the VSFG process or the extinction of the infrared laser by the gold nanoparticles. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码:83 / 87
页数:5
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