以時域有限差分法研究奈米金棒侷域表面電漿耦合效應

Finite-Difference Time-Domain Method for Simulating the Coupling between Localized Surface Plasmon of Au Nanorods

林良達(Liang-Da Lin)

指導教授 ： 蔡定平

國立臺灣大學/理學院/物理研究所/碩士(2009年)

https://doi.org/10.6342/NTU.2009.03323

摘要

外加入射光與奈米金棒間的交互震盪可以驅動金屬表面的自由電子作群集震盪，此即為表面電漿震盪(Surface plasmon resonance ,SPR)。
本論文以三維的時域有限差分法做為工具，選擇Drude-Critical Point色散模型來模擬金屬，並使用卷積完美匹配層作為相對應的吸收邊界，以頻譜分析在不同排列方式下奈米金棒的耦合情形，針對其模態對應波長之紅藍移現象進行討論與解釋。

關鍵字

奈米光學 ； 侷域表面電漿耦合 ； 時域有限差分法 ； 奈米金棒

並列摘要

The interaction between Au nanorods and incident light will drive free electrons to vibrate collectively on metallic surface . The phenomenon is called Surface plasmon resonance (SPR).
In this thesis, Our simulation tool is three-dimensional finite-difference time-domain(3D FDTD) method, combined with Drude-critical point(Drude-CP) model for metal dispersion and convolutional perfectly matched layer(CPML) for absorbing layer. We analyze the spectral characteristic in coupled gold nanorods with different arragements, and then the explanations of the shifts of LSPR wavelength for different arrangements are presented.

並列關鍵字

nano optics ； LSPR ； FDTD ； au nanorod

參考文獻

[5] Yu, Y. Y., Chang, S. S., Lee C. L., Wang. C. R.C.J. Phys. Chem. B 101, 6661 (1997).

[11] Hung Ji Huang, Chin-ping Yu, Hung Chun Chang, Kuo Pin Chiu, Hao Ming Chen, Ru Shi Liu, and Din Ping Tsai, Optics Express, Vol. 15, Issue 12, pp.7132-7139 (2007).

[13] Thomas Wriedt, Journal of Quantitative Spectroscopy & Radiative Transfer 110 pp.833–843 (2009).

[4] X. H. Huang, I. H. El-Sayed, W. Qian, and M. A. El-sayed, Journal of American Chemical Society 128, pp.2115-2120 (2006).

[12] Allen Taflove, Susan C. Hagness, "Computational Electrodynamics, The Finite-Difference Time-Domain Method, 3rd Edition" (2005).