FDTD Analysis on Geometrical Parameters of Bimetallic Localized Surface Plasmon Resonance-Based Sensor

2015 6th International Conference on Intelligent Systems, Modelling and Simulation Pub Date : 2015-02-09 DOI:10.1109/ISMS.2015.12

F. A. Said, P. Menon, S. Shaari, B. Majlis

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引用次数: 14

Abstract

The localized surface plasmon resonance (LSPR) properties are numerically analyzed using finite-difference time domain (FDTD) method, which is a reliable technique in solving Maxwell's equations in dispersive medium. Optical properties and LSPR characteristics were analyzed with Titanium Nitride (TiN) as an adhesion layer at gold(Au)/silver(Ag) interface. The reflection spectra of bimetallic layer nano-holes was compared with various metallic layer thicknesses of Au and Ag, hole radii and lattice period. When compared between single and bimetallic Ag/TiN/Au nano-hole layers, it showed that the layer with 70nm-thick Ag/5nm-thick TiN/50nm-thick Au (Ag70/TiN5/Au50) gave greater LSPR-based sensor performance with narrower plasmonic line width and better full width at half maximum (FWHM). Change in geometrical parameters such as lattice period and hole radii was affected the sensitivity and detection accuracy of Ag70/TiN5/Au50 nano-hole layer, which maximum of 90.9% reflection intensity and minimum of 18nm FWHM were obtained.

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基于双金属局域表面等离子体共振传感器几何参数的FDTD分析

利用时域有限差分(FDTD)方法对局部表面等离子体共振(LSPR)特性进行了数值分析，该方法是求解色散介质中麦克斯韦方程组的一种可靠方法。研究了氮化钛(TiN)在金(Au)/银(Ag)界面作为粘附层的光学性质和LSPR特性。比较了双金属层纳米孔的反射光谱与Au和Ag不同金属层厚度、孔半径和晶格周期的关系。对比单金属和双金属Ag/TiN/Au纳米孔层，结果表明，70nm厚Ag/5nm厚TiN/50nm厚Au (Ag70/TiN5/Au50)纳米孔层具有更好的lsr传感器性能，等离子体线宽更窄，半峰全宽更好。晶格周期和孔半径等几何参数的变化影响Ag70/TiN5/Au50纳米孔层的灵敏度和检测精度，最大反射强度为90.9%，最小FWHM为18nm。

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2015 6th International Conference on Intelligent Systems, Modelling and Simulation

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