Tailoring Optical Properties of a Large-Area Plasmonic Gold Nanoring Array Pattern.
Tailoring Optical Properties of a Large-Area Plasmonic Gold Nanoring Array Pattern.
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DOI：
10.1021/acs.jpcc.7b11660
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发表时间：
2018-06-28
期刊：
影响因子：
--
通讯作者：
Wu N
中科院分区：
文献类型：
--
作者：
Kasani S;Zheng P;Wu N
一种新的制造路线，它结合了纳米球光刻与硅基洁净室微加工工艺，已被开发出生产大面积的远程有序金纳米环阵列图案在一个可控的方式。实验和时域有限差分（FDTD）模拟表明，纳米环阵列图案的表面等离子体共振峰（SPR）可以通过改变环的厚度、环的高度、环的外径和相邻环之间的差距等几何参数在很大的光谱范围内进行系统地调谐。对于具有大间隙的Au纳米环阵列，在相邻环之间不存在等离子体激元耦合的情况下，单个纳米环的内外表面都发生了局部电磁场增强;而Au纳米环阵列的周期性对等离子体激元特性没有任何影响。对于具有小间隙的Au纳米环阵列，等离子体激元耦合发生在相邻环之间。结果，特征等离子体激元带分裂成对应于成键SPR模式和反键SPR模式的两个新峰。当相邻环之间的差距减小时，局部电磁场增强变强，但SPR峰发生偏移。因此，为了使表面增强的拉曼散射信号最大化，需要调谐Au纳米环阵列的几何参数以平衡来自共振激发（光谱重叠）和局部EM场增强的贡献。
A new fabrication route, which combines nanosphere lithography with silicon-based clean-room microfabrication processes, has been developed to produce large-area long-range ordered gold nanoring array patterns in a controllable fashion. Both the experimentation and the finite-difference time-domain (FDTD) simulation show that the surface plasmon resonance peak (SPR) of the nanoring array pattern can be tuned systematically in a large spectral range by varying the geometry parameters such as the ring thickness, the ring height, the ringer outer diameter, and the gap between neighboring rings. For the Au nanoring arrays with a large gap in the absence of plasmon coupling between neighboring rings, the local electromagnetic (EM) field enhancement occurs at both the outer and inner surfaces of individual nanorings; and the periodicity of Au nanoring array has no any effect on the plasmonic properties. For the Au nanoring arrays with a small gap, plasmon coupling takes place between neighboring rings. As a result, the characteristic plasmonic band is split into two new peaks corresponding to a bonding SPR mode and an antibonding SPR mode. The local EM field enhancement becomes stronger with a decrease in the gap between neighboring rings, but the SPR peaks shift away. Therefore, to maximize the surface-enhanced Raman scattering signal, the geometry parameters of the Au nanoring array need to be tuned to balance the contributions from the resonance excitation (spectral overlap) and the local EM field enhancement.
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