Surface Plasmon Resonance of A Bimetallic Nanostructured Film for Enhanced Optical Sensitivity
Surface Plasmon Resonance of A Bimetallic Nanostructured Film for Enhanced Optical Sensitivity
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DOI：
10.1002/slct.201800576
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发表时间：
2018-03-22
期刊：
影响因子：
2.1
通讯作者：
Wei, Jianjun
中科院分区：
文献类型：
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作者：
Mabe, Taylor;Zeng, Zheng;Wei, Jianjun
报道了一种Ag/Au纳米狭缝薄膜的表面等离子体激元（SP）产生和折射率（RI）灵敏度。在透射表面等离子体共振（tSPR）中将这些与金器件进行比较。薄膜的主共振峰随周期性变化，并与时域有限差分法（FDTD）模拟研究相关。通过半解析模型分析了双缝结构的表面等离子体共振现象。该模型能够分解和定量分析SP产生在平面波照明下的孔径。纳米结构的金属薄膜提供了与微流体集成的灵活性，允许简化仪器和对准。计算和实验表明，由于银的加入沿着金的生物相容性，银膜提供了RI敏感性的增加。发现Ag/Au膜是非扩散的、长期稳定的（超过几个月），并且提供了比金当量更高的灵敏度（约53/RIU）。
A bimetallic (Ag/Au) nanoslit film is reported on surface plasmon (SP) generation and refractive index (RI) sensitivity. These were compared to gold devices in transmission surface plasmon resonance (tSPR). The bimetallic films have a primary resonant peak that shifts with periodicity and correlates well with Finite-Difference Time-Domain (FDTD) simulation studies. The SPR of bimetallic nanoslit structures is analyzed via a semi-analytical model. The model enables decomposition and quantitative analysis of SP generation at the aperture under plane-wave illumination. The nanostructured, metallic, thin films provide flexibility to integrate with microfluidics, allowing for simplified instrumentation and alignment. Calculation and experimentation demonstrate that bimetallic films afford an increase in RI sensitivity due to the addition of silver along with the biocompatibility of gold. The Ag/Au films were found to be non-diffusing, long-term stable (over several months), and provided an increase in sensitivity (about 53/RIU) over gold equivalents.