Indium for Deep-Ultraviolet Surface-Enhanced Resonance Raman Scattering
Indium for Deep-Ultraviolet Surface-Enhanced Resonance Raman Scattering
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DOI：
10.1021/ph500076k
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发表时间：
2014-07-01
期刊：
影响因子：
7
通讯作者：
Kawata, Satoshi
中科院分区：
文献类型：
--
作者：
Kumamoto, Yasuaki;Taguchi, Atsushi;Kawata, Satoshi
铟在深紫外区的介电常数满足低吸收损耗的局域表面等离子体共振条件。我们报道了铟在DUV中作为一种有效的表面增强共振拉曼散射(SERRS)的试剂。通过在熔融石英玻璃衬底上沉积铟，并控制沉积厚度，以定制DUV中的等离子体共振，制备了镀铟的SERS衬底。在266 nm激发下，从镀铟衬底上沉积的腺嘌呤薄膜中观察到了表面增强拉曼光谱，其信号强度是裸熔石英玻璃衬底的11倍。FDTD计算表明，在镀铟的衬底上可以局部产生增强的电磁场。考虑到激发光斑中增强场区的体积，我们估计平均增强因子为10(2)或更高。我们的结果表明，铟是一种很有前途的、易于使用的金属，可以有效地激发含有少量分子的样品的DUV-SERR。
The dielectric constant of indium in the deep-ultraviolet (DUV) region satisfies the conditions for localized surface plasmon resonance with low absorption loss. We report that indium acts as an agent of efficient surface-enhanced resonance Raman scattering (SERRS) in the DUV. Indium-coated SERRS substrates were prepared by depositing indium on fused silica glass substrates, with control, of the deposition thickness to tailor the plasmon resonance in the DUV. With excitation 266 nm, SERRS was observed from thin adenine films deposited on the indium-coated substrates, and the signal intensity was up to 11 times higher than that of a bare fused silica glass substrate. FDTD calculations showed that an enhanced electromagnetic field can be locally generated on the indium-coated substrates. Considering the volume, of the enhanced field region in the excitation spot, we estimated the average enhancement factor to be 10(2) or higher. Our results indicate that indium is a Promising and easy-to-use metal for efficiently exciting DUV-SERRS of samples containing a small number of molecules.