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Long-Range Surface Plasmon Resonance Configuration for Enhancing SERS with an Adjustable Refractive Index Sample Buffer to Maintain the Symmetry Condition
ACS Omega ( IF 3.7 ) Pub Date : 2020-12-16 , DOI: 10.1021/acsomega.0c03923 Yu Liu 1, 2 , Haitao Zhang 1, 3, 4 , Yijia Geng 5 , Shuping Xu 5 , Weiqing Xu 5 , Jie Yu 1 , Wenyuan Deng 1 , Bo Yu 1 , Liping Wang 1, 2
ACS Omega ( IF 3.7 ) Pub Date : 2020-12-16 , DOI: 10.1021/acsomega.0c03923 Yu Liu 1, 2 , Haitao Zhang 1, 3, 4 , Yijia Geng 5 , Shuping Xu 5 , Weiqing Xu 5 , Jie Yu 1 , Wenyuan Deng 1 , Bo Yu 1 , Liping Wang 1, 2
Affiliation
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We propose a method to maintain the symmetry condition of the refractive index with respect to a dielectric buffer layer for a long-range surface plasmon resonance (LRSPR) configuration. The symmetry condition was maintained by changing the concentration of the ethylene glycol aqueous solution (sample buffer layer) to match the refractive index of the MgF2 film. Maintenance of the symmetry condition is necessary for exciting the LRSPR mode and increasing the electric field intensity near the film. We used a four-phase Kretschmann resonance setup composed of a K9 prism, MgF2 film, Ag film, and sample buffer layer. The incident angle-dependent surface-enhanced Raman scattering (SERS) spectra were measured in the evanescent field. At the SPR angle, the SERS signal of the symmetric configuration was 60 times higher than that of the conventional SPR configuration. Moreover, the electric field penetration depth of the symmetric long-range surface plasmon configuration (>1000 nm) was longer than that of their asymmetric counterparts. The enhancement factor of the symmetric configuration was 8.6 × 107, which corresponded to the lowest detectable concentration for 4-mercaptopyridine, reaching 1.0 × 10–10 M at the resonance angle. Thus, the symmetric LRSPR configuration has great potential for label-free sensing and detection of macromolecules and biomolecules.
中文翻译：
远程表面等离子体共振配置，可通过可调折射率样品缓冲液增强SERS，以保持对称性
我们提出了一种方法，可针对远程表面等离子体激元共振（LRSPR）配置维持相对于介电缓冲层的折射率对称性条件。通过改变乙二醇水溶液（样品缓冲层）的浓度以匹配MgF 2膜的折射率来维持对称性。为了激发LRSPR模式并增加薄膜附近的电场强度，必须保持对称条件。我们使用了一个由K9棱镜MgF 2组成的四相Kretschmann共振装置膜，银膜和样品缓冲层。在the逝场中测量入射角相关的表面增强拉曼散射（SERS）光谱。在SPR角处，对称配置的SERS信号比传统SPR配置的信号高60倍。而且，对称的远程表面等离激元构型的电场穿透深度（> 1000 nm）比非对称的等离激元更长。对称构型的增强因子为8.6×10 7，对应于4-巯基吡啶的最低可检测浓度，在共振角达到1.0×10 –10M。因此，对称的LRSPR构型在无标记的大分子和生物分子传感和检测方面具有巨大的潜力。
更新日期：2020-12-29
中文翻译：
远程表面等离子体共振配置，可通过可调折射率样品缓冲液增强SERS，以保持对称性
我们提出了一种方法，可针对远程表面等离子体激元共振（LRSPR）配置维持相对于介电缓冲层的折射率对称性条件。通过改变乙二醇水溶液（样品缓冲层）的浓度以匹配MgF 2膜的折射率来维持对称性。为了激发LRSPR模式并增加薄膜附近的电场强度，必须保持对称条件。我们使用了一个由K9棱镜MgF 2组成的四相Kretschmann共振装置膜，银膜和样品缓冲层。在the逝场中测量入射角相关的表面增强拉曼散射（SERS）光谱。在SPR角处，对称配置的SERS信号比传统SPR配置的信号高60倍。而且，对称的远程表面等离激元构型的电场穿透深度（> 1000 nm）比非对称的等离激元更长。对称构型的增强因子为8.6×10 7，对应于4-巯基吡啶的最低可检测浓度，在共振角达到1.0×10 –10M。因此，对称的LRSPR构型在无标记的大分子和生物分子传感和检测方面具有巨大的潜力。
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