Chu Shuwen, Wang Qiao, Yu Li, Gao Huixuan, Liang Yuzhang, Peng Wei
School of Optoelectronic Engineering and Instrumentation Science, Dalian University of Technology, Dalian 116024, China.
School of Physics, Dalian University of Technology, Dalian 116024, China.
Nanomaterials (Basel). 2020 Feb 11;10(2):308. doi: 10.3390/nano10020308.
A high-performance multi-resonance plasmonic sensor with double-layer metallic grooves is theoretically constructed by introducing a polymethyl methacrylate groove with a numerical simulation method. Multiple resonance wavelengths can be generated at the oblique incidence, and the number and feature of resonant mode for sensing detection is different for various incident angles. Specifically, at the incident angle of 30°, the reflection spectrum exhibits two resonant dips, in which the dip at the wavelength of 1066 nm has an extremely narrow line width of ~4.5 nm and high figure of merit of ~111.11. As the incident angle increases, the electric dipole mode gradually weakens, but the surface plasmon resonance and cavity resonance mode are enhanced. Therefore, for an incident angle of 65°, three resonance dips for sensing can be generated in the reflection spectrum to realize three-channel sensing measurement. These double-layer plasmonic grooves have potential in the development of advanced biochemical surface plasmon polariton measurements.
采用数值模拟方法，通过引入聚甲基丙烯酸甲酯凹槽，从理论上构建了一种具有双层金属凹槽的高性能多共振等离子体传感器。在斜入射时可产生多个共振波长，并且对于不同的入射角，用于传感检测的共振模式的数量和特征有所不同。具体而言，在30°入射角下，反射光谱呈现出两个共振凹陷，其中波长为1066 nm处的凹陷具有~4.5 nm的极窄线宽和约111.11的高品质因数。随着入射角增大，电偶极子模式逐渐减弱，但表面等离子体共振和腔共振模式增强。因此，对于65°入射角，反射光谱中可产生三个用于传感的共振凹陷，以实现三通道传感测量。这些双层等离子体凹槽在先进生化表面等离子体激元测量的发展中具有潜力。
