Surface Plasmon Resonance (SPR) in a Chemically Etched ZnSe Substrate and its Effect on the Raman Signal Enhancement

被引:0
|
作者
Islam, Syed K. [1 ]
Tamargo, Maria
Moug, Richard
Lombardi, John R.
机构
[1] CUNY City Coll, Dept Chem, New York, NY 10031 USA
来源
IMAGE SENSING TECHNOLOGIES: MATERIALS, DEVICES, SYSTEMS, AND APPLICATIONS II | 2015年 / 9481卷
关键词
Surface Plasmon; Charge Transfer; Semiconductors; Mie Scattering; SERS; MBE; CHARGE-TRANSFER; QUANTUM DOTS; SCATTERING; MOLECULES;
D O I
10.1117/12.2182968
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
We report the observation of surface-enhanced Raman scattering (SERS) from a chemically etched ZnSe surface using 4-mercaptopyridine (4-MPy) as probe molecules. A thin film of ZnSe is grown by molecular beam epitaxy (MBE) and then etched using a strong acid. Protrusions of hemi-ellipsoidal nanoparticles are observed on the surface. Using the results of the Mie theory, we controlled the size of the nanoparticles to overlap significantly with maximum efficiency of near-field plasmon enhancement. In the Raman spectrum, we observe large enhancements of the a(1), b(1), and b(2) modes when 4-MPy molecules are adsorbed on the surface using a 514.5 nm laser for excitation, indicating strong charge-transfer contributions. An enhancement factor of (2x10(6)) is observed comparable to that of silver nanoparticles. We believe this large enhancement factor is an indication of the coupled contribution of several resonances. We propose that some combination of surface plasmon, charge transfer, band gap resonances are most likely the contributing factors in the observed Raman signal enhancement, since all three of these resonances lie close to the excitation wavelength.
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页数:10
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