几何参数控制金三角纳米柱和纳米盒的LSPR性质的数值研究
Controlling the LSPR properties of Au triangular nanoprisms and nanoboxes by geometrical parameter: a numerical investigation
摘要：
利用时域有限差分法（FDTD）模拟了金三角形纳米棱镜和纳米盒的消光光谱。结果表明，折射率灵敏度随纳米棱柱长径比的增大和纳米盒壁厚的减小呈线性或近似指数增长。传感品质因数（FOM）的计算表明，有一个最佳的壁厚为每个边缘的长度和高度的盒子，这使得他们成为有效的传感应用的有前途的候选人。我们还表明，与立方纳米盒和其他固体结构相比，三角形纳米盒中的更高FOM是纳米颗粒形状所固有的。
英文摘要：
We have simulated the extinction spectra of Au triangular nanoprisms and nanoboxes by finite difference time domain (FDTD) method. It is found that the refractive index sensitivity increases linearly and near exponentially as the aspect ratio of nanoprisms increases and wall thickness of nanoboxes decreases. A sensing figure of merit (FOM) calculations shows that there is an optimum wall thickness for each edge length and height of the box, which makes them to be promising candidate for effective sensing applications. We have also shown that the higher FOM in triangular nanoboxes compared to the cubic nanoboxes and other solid structure is inherent in the shape of nanoparticles.
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