共查询到20条相似文献，搜索用时 31 毫秒
1.
一种新的拉曼散射——表面增强拉曼散射 总被引：1，自引：0，他引：1
阐述了拉曼散射的原理,重点介绍了表面增强拉曼散射(SERS)的特点、增强原理、衬底特点以及最新进展.指出目前普遍接受的增强机理是电磁增强机制和化学增强机制同时存在,只是两者在不同实验体系中所占的比重不同. 相似文献
2.
Raman lasers based on potassium gadolinium tungstate and lead tungstate crystals pumped bya≈120 ps Nd: YAG laser at 1.064 μm were developed. High reflection mirrors for the Stokes wavelength have been used to generate
near-infrared and eye safe spectral region of 1.15–1.32 μm. Second harmonic generation of the generated Raman lasers was observed.
Eifficient multiple Stokes and anti-Stokes picosecond generation in 64 crystals have been shown to exhibit stimulated Raman
scattering on about 700 lines covering the whole visible and near-infrared spectrum. All stimulated Raman scattering (SRS)
wavelengths in the visible and near-infrared spectrum are identified and attributed to the SRS-active vibration modes of these
crystals. 相似文献
3.
阐述了光纤拉曼放大器的原理、分类,并对其研究现状、发展趋势和研究展望进行了探讨和总结。其中,采用有限元法,着重数值仿真了光纤拉曼放大器放大信号的原理过程。结果表明,基于Chraplyvy模型能够较好地模拟出受激拉曼散射作为光纤拉曼放大器原理的过程,并且其程序运行效率高于采用洛仑兹模型。通过研究综述,为光纤拉曼放大器的理论研究、实验和工程应用测试工作提供了参考。 相似文献
4.
研究糠醛分子的常规拉曼谱（NRS）和在银镜上的表面增强拉曼光谱（SERS）谱,通过运用DFT（density functional theory,密度泛函理论）计算了FUR（Furfural）的分子振动光谱,对拉曼峰进行指认,并给出了糠醛在银镜上的吸附状态． 相似文献
5.
拉曼光谱技术是一种非弹性光散射分析技术,由于它与物质的分子振动、转动能级有关。可以鉴别各种物质的种类和特性,适用于考古文物的分析．目前拉曼光谱作为无损的分析方法,已经广泛应用于考古研究中．本文综述了近几年拉曼光谱在青铜器、颜料、古玉、古陶器等考古研究中的应用,并对其在该领域的发展前景作了进一步的展望． 相似文献
6.
在前人研究的基础上,通过实例和课题研究将拉曼光谱在物证鉴定中的应用进行总结与阐释,特别阐述了将拉曼光谱应用于文件检验中的优势,以及拉曼光谱在添改变造文件检验、文件材料检验、朱墨时序检验及不同成分交叉笔画的先后顺序检验中的应用.以期将拉曼光谱这种重要的分析测试手段引入并推广到物证鉴定领域中. 相似文献
7.
In this paper, a novel surface-enhanced Raman scattering (SERS) sensor combined with fused biconical taper fiber (FBTF) and
film coated with silver sols is proposed. This structure is designed to significantly increase the SERS active surface when
the length of the taper is increased and the radius is reduced, since the penetration depth is inversely proportional to the
taper radius and proportional to the taper length according to the fiber-optic evanescent-wave theory. Based on the SERS sensing
principle, the feasibility of FBTF sensor is analyzed in this paper. As a result, the Raman spectrum of R6G is obtained from
the fused biconical taper zone surface coating with the silver sols in our experiments. The detected concentration is up to
10−7mol/L. 相似文献
8.
P. K. Basu 《Resonance》2007,12(10):37-46
The increased use of optoelectronic devicessuch as TV screens and computer monitors in everyday life, calls for a material
on which integration of all circuits may be performed. Silicon, the most widely used material in electronics, has limited
application in optoelectronics due to its poor light emission property. In this article, the need for silicon photonics in
present day ICs, and communication, the reason for its inefficient light emission, and recent breakthrough in the form of
Si Raman laser are discussed. 相似文献
9.
我们把拉曼光谱仪与实验室自制的光纤探针结合起来,建立了微区拉曼光谱系统,并基于此装置进行了实际测量,效果较好. 相似文献
10.
字画真伪鉴定是字画收藏和研究中的一个重要课题,民间字画真伪鉴定由于其人为性和经验性而具有一定的局限性。拉曼光谱从物质的分子振动光谱来识别和区分不同的物质结构,成为研究物质分子结构的有效手段,具有无损性、指纹性、快速性、灵敏性、简单性等特点。所以可以用于辅助鉴别字画的真伪。 相似文献
11.
Li-li Chen Li Jiang Ya-lun Wang Jun Qian Sailing He 《Journal of Zhejiang University. Science. B》2010,11(6):417-422
We report the application of multilayered polyelectrolyte-coated gold nanorods(GNRs) as multifunctional optical contrast agents for cancer cell imaging.The surface modification of GNRs improves their chemical stability and facilitates them to be taken up by cancer cells through electrostatic interaction.The unique longitudinal surface plasmon resonance property of GNRs makes them suitable as both scattering contrast agents and Raman contrast agents.In our experiments,the staining of GNRs in cells was furthe... 相似文献
12.
首次利用激光拉曼技术对微量乙烯气体进行测试和分析,得到500 cm-1~3500 cm-1内乙烯气体的拉曼光谱。结果表明,乙烯气体的拉曼光谱有明显特征峰,这一性质为进一步研究果蔬散发乙烯气体的检测提供了依据。 相似文献
13.
研究了4种单链多聚核苷酸(PolyA,PolyU,PolyG,PolyC)的喇曼光谱,分析了不同盐溶液浓度对核酸主链构象的影响,并给出了各种单链核酸主要谱带的初步指认.研究表明,喇曼光谱对于研究核酸的氢键配位、主链构象和碱基堆积来说是一种强劲的工具. 相似文献
14.
光纤Raman放大的抽运光采用窄脉冲形式时,需对连续波理论进行修正。基于光纤Raman放大的振幅耦合方程,分析色散、走离、非线性、SRS等对Raman放大带来的影响。 相似文献
15.
Ju Jianhua Mo Yaowu Huang Xiaoqin Xia Yiben 《上海大学学报(英文版)》1998,2(4):337-341
ｏｎ ａｎｄ Ｈｏｍｏｇｅｎｉｚａｔｉｏｎ ｏｆ Ｄｉａｍｏｎｄ Ｆｉｌｍ ｉｎ ｔｈｅ Ｍｕｌｔｉｆｉｌａｍｅｎｔ ＣＶＤ ＳｙｓｔｅｍTX１ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｈｏｔ－ｆｉｌａｍｅｎｔｃｈｅｍｉｃａｌｖａｐｏｒｄｅｐｏｓｉｔｉｏｎ（ＨＦＣ... 相似文献
16.
贾廷见 《商丘职业技术学院学报》2012,11(2):65-67,90
利用显微拉曼技术研究了真、假茅台酒的正常拉曼光谱(Normal Raman Spectroscopy)和表面增强拉曼光谱(Surface Enhanced Raman Spectroscopy).在室温环境下,得到了真、假茅台酒的在632.8 nm激发光下的NRS,但是它们谱图差别不太明显.通过研究活性衬底银胶上真、假茅台酒的SERS,结果显示,它们的SERS谱差异明显.特别是在真茅台酒的SERS中,出现了属于其主要香味成分糠醛的谱峰,而在假茅台酒SERS中,这些峰不出现或者强度很弱.因此SERS光谱法可以作为鉴别茅台酒品质和真伪的一种手段. 相似文献
17.
在电化学体系下,让微溶于水的临硝基苯甲酸分子吸附在粗糙的Ag电极上,使用波长为514.5nm的激光激发,得到了非常精细的表面增强拉曼光谱。改变电极上的电位,所得表面增强拉曼光谱峰和强度也是发生变化,进一步的推断临硝基苯甲酸分子在Ag纳米颗粒上吸附方式。 相似文献
18.
The combined characterizations of mobility and phonon scattering spectra allow us to probe hole transport process in epitaxial PbSe crystalline films grown by molecular beam epitaxy （MBE）. The measurements of Hall effect show p-type conductivity of PbSe epitaxial films. At 295 K, the PbSe samples display hole concentrations of （5-8）× 10^17 cm^-3 with mobilities of about 300 cm^2/（V·s）, and at 77 K the hole mobility is as high as 3×10^3 cm^2/（V·s）. Five scattering mechanisms limiting hole mobilities are theoretically analyzed. The calculations and Raman scattering measurements show that, in the temperatures between 200 and 295 K, the scattering of polar optical phonon modes dominates the impact on the observed hole mobility in the epitaxial PbSe films. Raman spectra characterization observed strong optical phonon scatterings at high temperature in the PbSe epitaxial films, which is consistent with the result of the measured hole mobility. 相似文献
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20.
表面增强拉曼光谱（SERS）技术具有操作简便、灵敏度高、无需复杂样品前处理,可适用于现场快速分析等优点,在农业、食品、医药、生物和化学等领域开始得到应用。本文主要介绍了SERS及其基底的研究,综述了近年来SERS技术在食品质量与安全检测中的应用。 相似文献