Enhancing the Magnetic Plasmon Resonance of Three-Dimensional Optical Metamaterials via Strong Coupling for High-Sensitivity Sensing
Enhancing the Magnetic Plasmon Resonance of Three-Dimensional Optical Metamaterials via Strong Coupling for High-Sensitivity Sensing
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DOI：
10.1109/jlt.2018.2846019
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发表时间：
2018-08-15
影响因子：
4.7
通讯作者：
Park, Gun-Sik
中科院分区：
文献类型：
--
作者：
Chen, Jing;Nie, Hai;Park, Gun-Sik
提出了一种有效的方法来增强和改变三维光学超材料中的磁等离子体共振，该材料由周期性排列的银垂直开口环谐振器（VSRR）组成，用于高灵敏度传感。通过将3D超材料放置在由二氧化硅介电间隔层隔开的厚银膜上方，可以实现VSRRs中的MP共振与在银膜上传播的表面等离子体激元（SPP）之间的强耦合，并且产生具有巨大增强的磁场的超窄带混合MP模式。为了使耦合发生，SPP的磁场方向应平行于VSRR中感应的磁矩。更重要的是，由于超窄带混合MP模式对周围介质非常敏感，因此3D超材料的灵敏度和品质因数（FOM）可以分别高达700 nm/RIU和170，这表明所提出的3D Meta材料在无标记生物医学传感中具有潜在的应用。
We report an effective method to enhance and modify the magnetic plasmon (MP) resonance in three-dimensional (3D) optical metamaterials consisting of periodic arrays of silver vertical split-ring resonators (VSRRs) for high-sensitivity sensing. By positioning the 3D metamaterials above a thick silver film separated by a silica dielectric spacer layer, the strong coupling between the MP resonance in the VSRRs and the surface plasmons polaritons (SPPs) propagating on the silver film can be realized and gives rise to an ultra-narrowband hybrid MP mode with a huge enhancement of magnetic fields. For the coupling to happen, the magnetic field direction of the SPPs should be parallel to the magnetic moment induced in the VSRRs. More importantly, because the ultra-narrowband hybrid MP mode is extremely sensitive to the surrounding media, the sensitivity and the figure of merit (FOM) of the 3D metamaterials can reach as high as 700 nm/RIU and 170, respectively, suggesting that the proposed 3D meta materials hold potential applications in label-free biomedical sensing.