| 镀银膜光探针尖与银粒子间场增强最佳条件的FDTD模拟研究 |
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| 引用本文： | 祝雷,吴世法,李亚琴.镀银膜光探针尖与银粒子间场增强最佳条件的FDTD模拟研究[J].四川激光,2007,28(6):84-84,86. |
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| 作者姓名： | 祝雷 吴世法 李亚琴 |
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| 作者单位： | 大连理工大学物理与光电工程学院,辽宁大连116024 |
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| 摘 要： | 本文利用时域有限差分法(FDTD)模拟了在p极化平面波侧向照射下,扫描近场光学显微镜镀银膜四面锥形探针扫描直径30纳米银球"热点"处的电场增强因子及最佳条件.我们得出了膜厚和探针与银球之间间隙的最佳条件:间隙3纳米时最佳膜厚为20～50纳米,此时的场增强因子最强为70左右;膜厚30纳米时,间距1纳米增强因子最强为298.
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| 关 键 词： | 时域有限差分法(FDTD) 扫描近场光学显微镜(SNOM) 热点 电场增强 银膜 光探针 银粒子 电场增强因子 最佳 条件 FDTD method 模拟研究 particle silver probe field enhancement optimal parameters 间距 纳米银 间隙 膜厚 热点 直径 扫描近场光学显微镜 |
| 文章编号： | 0253-2743（2007）06-0084-02 |
| 收稿时间： | 2007-07-05 |
| 修稿时间： | 2007年7月5日 |
The study of optimal parameters of field enhancement between the pyramidal silver- coated probe tip and the silver nano- particle by FDTD method |
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| ZHU Lei,WU Shi-fa,LI Ya-qin.The study of optimal parameters of field enhancement between the pyramidal silver- coated probe tip and the silver nano- particle by FDTD method[J].Laser Journal,2007,28(6):84-84,86. |
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| Authors: | ZHU Lei WU Shi-fa LI Ya-qin |
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| Abstract: | In this paper,finite-difference time-domain(FDTD)technique simulations are performed to study the enhancement between a pyramidal probe tip coated with silver film and a silver spherical nanoparticle under the illumination of a p-polarized plane wave.We get the optimal parameters of the thickness of the silver coat and the distance between the tip and the particle for the enhancement:when the distance is 3 nm,the optimal thickness is 20-50 nm and the enhancement factor is about 70;when the thickness is 30 nm,the optimal distance is 1 nm and the enhancement factor is 298. |
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| Keywords: | finite-difference time-domain(FDTD) seanning near-field optical microscope(SNOM) hot spot electric enhancement |
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