米状银纳米颗粒对局域电场增强的理论模拟

发布时间：2018-01-06 00:09

本文关键词：米状银纳米颗粒对局域电场增强的理论模拟　出处：《红外与激光工程》2017年02期 　论文类型：期刊论文

【摘要】：为了提高表面增强拉曼散射技术中基底的增强效果,采用时域有限差分算法从理论上对不同入射光偏振方向下米状银纳米颗粒的电场增强进行了模拟分析,分别研究了单个银纳米颗粒和不同组合的二聚体以及三聚体的形状、间距对局域电场强度的影响,并且详细讨论了导致电场增强的原因。结果表明,当米状银纳米颗粒长度约为300 nm时,应控制其短轴约为36 nm,间距约为2 nm,且入射光偏振方向平行于长轴,此时在颗粒的尖端处均会产生最大电场增强,其中二聚体尖端对尖端情形下增强效果尤为明显。该结论为拉曼基底实验中纳米颗粒的制备提供了一定的理论基础。
[Abstract]:In order to improve the effect of enhanced Raman scattering technology in surface enhanced, by using the finite difference time domain algorithm theoretically enhanced to simulate different electric field polarization direction of the incident light granular silver nano meters, were studied by single silver nanoparticles and two different combinations of the dimer and trimer shape, spacing effect the local electric field strength, and discussed the cause of enhancement of the electric field. The results showed that when m shaped silver nanoparticles of about 300 nm in length, it is necessary to control the short axis is about 36 nm. The distance is about 2 nm, and the polarization of the incident light is parallel to the long axis, at the tip of the particles were will produce the maximum electric field enhancement, of which two cases of dimer tip tip enhanced obviously. Conclusion the nanoparticles Raman experiments in preparation to provide a certain theoretical basis.

【作者单位】：燕山大学理学院;燕山大学里仁学院;
【基金】：国家自然科学基金(50875232) 燕山大学青年教师自主研究计划课题(15LGBO22)
【分类号】：TB383.1;O441
【正文快照】： 0引言表面增强拉曼散射(surface-enhanced Ramanscattering,SERS)技术是将拉曼光谱应用在表面检测科学中所引起的一种奇特的局域电场增强现象[1]。近年来,SERS技术的应用范围十分广泛,主要涉及食品含量检测、大气环境保护、生物医学和临床诊断等交叉领域[2-3]。利用SERS光谱进

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