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米状银纳米颗粒对局域电场增强的理论模拟
  • ISSN号:1007-2276
  • 期刊名称:《红外与激光工程》
  • 时间:0
  • 分类:O433[机械工程—光学工程;理学—光学;理学—物理]
  • 作者机构:[1]燕山大学理学院,河北秦皇岛066004, [2]燕山大学里仁学院,河北秦皇岛066004
  • 相关基金: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(15LGB022)
中文摘要:

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。

英文摘要:

Raman scattering and surface-enhanced Raman scattering (SERS) have attracted the attention of researchers due to the great potential applications in various research fields, including biomolecular sensing, analytical chemistry, surface science and material science. In order to improve the enhancement effect of the SERS substrate, the electric field enhancement of rice-shaped silver monomer, dimer, and trimer nanoparticles was simulated by the finite difference time domain method under different polarzation directions. The influence of the shape and spacing of the nanoparticles on local elecric field intensity were also studied and analyzed. On the above basis, the causes of electirc field enhancement were discussed in detail. The result shows that the electric field distributions of rice-shaped silver nanoparticles are different by changing the shape and spacing of the nanoparticles, as well as the polarization direction. The tip of the rice-shaped silver nanoparticle with long axis 300 nm, minor axis 36 nm and spacing 2 nm can produce maximum electric field enhancement when the incident polarization direction is parallel to the long axis. Moreover, due to the strong coupling between the nanoparticles, there is an obvious enhancement effect in the case of top (EF) is up to 2.4×10 11. The conclusion in the SERS experiments. to top configuration, and the obtained SERS provides theoretical basis for the preparation of enhancement factor silver nanoparticles

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期刊信息
  • 《红外与激光工程》
  • 中国科技核心期刊
  • 主管单位:中国航天科工集团
  • 主办单位:天津津航技术物理研究所
  • 主编:张锋
  • 地址:天津市空港经济区中环西路58号
  • 邮编:300308
  • 邮箱:irla@csoe.org.cn
  • 电话:022-58168883 /4/5
  • 国际标准刊号:ISSN:1007-2276
  • 国内统一刊号:ISSN:12-1261/TN
  • 邮发代号:6-133
  • 获奖情况:
  • 1996年获航天系统第五次科技期刊评比三等奖,1998年获航天系统第六次科技期刊评比二等奖,1997-2001年在天津市科技期刊评估中被评为一级期刊
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  • 俄罗斯文摘杂志,荷兰文摘与引文数据库,美国工程索引,美国剑桥科学文摘,英国科学文摘数据库,日本日本科学技术振兴机构数据库,中国中国科技核心期刊,中国北大核心期刊(2004版),中国北大核心期刊(2008版),中国北大核心期刊(2011版),中国北大核心期刊(2014版),中国北大核心期刊(2000版)
  • 被引量:17466