Discrete Dipole Approximation Simulation of the Surface Plasmon Resonance of Core/Shell Nanostructure and the Study of Resonance Cavity Effect

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• 作者：Xi-bin Xu ; Zao Yi ; Xi-bo Li ; Yu-ying Wang ; Xing Geng ; Jiang-shan Luo ; Bing-chi Luo ; You-gen Yi ; Yong-jian Tang
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：November 15, 2012
• 年：2012
• 卷：116
• 期：45
• 页码：24046-24053
• 全文大小：492K
• 年卷期：v.116,no.45(November 15, 2012)
• ISSN：1932-7455

文摘

Nanoshells have been previously shown to tune absorption frequencies efficiently. What will happen when a nanoshell embeds on a small core system? A theoretical model that a core composed of gold is embedded within a nanoshell of Au/Ag is constructed to answer this question. The calculations based on the discrete dipole approximation (DDA) method are performed and proved to converge accurately by satisfying the usual criteria related to the applicability of the DDA. The results show that the nanoshells in the core/shell system greatly influence the surface plasmon resonance (SPR). Indeed, the shell frequency is tuned to match the optical properties of the absorbing core leading to hybridization/mixing and possibly overall enhancement of absorption cross-section. The calculation of the field enhancement also shows that the location of the field enhancement is specified by the different resonance patterns.