[1]余海群,吴大建.椭圆截面活性银纳米管表面等离激元受激辐射放大研究[J].南京师范大学学报(工程技术版),2016,16(02):066.[doi:10.3969/j.issn.1672-1292.2016.02.011]
　Yu Haiqun,Wu Dajian.SPASER Properties of Active Silver Elliptical Nanotubes[J].Journal of Nanjing Normal University(Engineering and Technology),2016,16(02):066.[doi:10.3969/j.issn.1672-1292.2016.02.011]
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椭圆截面活性银纳米管表面等离激元受激辐射放大研究
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南京师范大学学报（工程技术版）[ISSN:1006-6977/CN:61-1281/TN]

卷:
16卷
期数:
2016年02期
页码:
066
栏目:
材料工程
出版日期:
2016-06-30

文章信息/Info

Title:
SPASER Properties of Active Silver Elliptical Nanotubes
作者:
余海群; 吴大建
江苏大学理学院，江苏 镇江 212013
Author(s):
Yu Haiqun; Wu Dajian
Faculty of Science，Jiangsu University，Zhenjiang 212013，China
关键词:
表面等离激元受激辐射放大; 银纳米管; 增益介质; 有限元方法
Keywords:
SPASER; silver nanotube; gain media; finite element method
分类号:
O539
DOI:
10.3969/j.issn.1672-1292.2016.02.011
文献标志码:
A
摘要:
基于有限元方法研究了内核包含活性介质的椭圆截面银纳米管的表面等离激元受激辐射放大（SPASER）特性. 研究发现，在电场偏振方向与椭圆长轴之间的夹角θ为0°时，当银纳米管活性内核的增益系数k增加到0.281 8，将在639.3 nm波长位置处产生表面等离激元（SP）偶极超共振；此时，在银纳米管表面可获得的表面增强拉曼因子可达到约2.56×1018，其足以满足单分子检测的要求. 在θ = 90°时，当k值增加到0.081 7，将在742.3 nm波长位置处发现SP偶极超共振. 此外，当θ = 0°时，银纳米管的SPASER增益阈值将随着银壳层厚度的减小而逐渐减小；当θ = 90°时，银纳米管的SPASER增益阈值将随着银壳层厚度的减小而逐渐增加. 当θ = 45°时，随着内核增益系数变大，将逐渐在两不同的临界波长位置观察到SPASER现象，因而具有较好的双频特性.
Abstract:
SPASER（Surface plasmon amplification by stimulated emission of radiation）properties of active silver elliptical nanotubes have been investigated by using the finite element method. When the angle θ between the excitation polarization and the long-axis of the ellipse is fixed at 0°，as the gain coefficient k increases to 0.281 8，a super-resonance can be observed at the wavelength of 639.3 nm in the active elliptical silver nanotube. Meanwhile，the maximal enhancement factor of surface enhanced Raman scattering can reach about 2.56×1018，which is high enough for the single molecule detection. As θ=90°，another super-resonance can be found in the active elliptical silver nanotube at the wavelength of 742.3 nm when the gain coefficient increases to 0.081 7. With decreasing the shell thickness，the gain threshold of the super-resonance of the silver elliptical nanotube with θ=0° decreases while the gain threshold increases for θ=90°. We have further found that when θ=45°，the two super-resonances can be observed in the active elliptical silver nanotube at two critical wavelengths with increasing the gain coefficient.

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备注/Memo

备注/Memo:
收稿日期：2016-04-15.　
基金项目：江苏大学研究生科研创新计划（KYXX_0037）.　
通讯联系人：余海群，硕士研究生，研究方向：表面等离激元光子技术、纳米光学. E-mail：384605769@qq.com
更新日期/Last Update: 2016-06-30