探索双曲性在表面增强拉曼传感中的作用
Exploring the role of hyperbolicity in surface enhanced Raman sensing
AI总结：
通过制备HMM与非HMM两种金纳米棒阵列SERS基底并检测R6G，结合COMSOL仿真和拉曼成像，研究双曲性对表面增强拉曼传感性能的影响。
摘要：
基于等离子体纳米结构的基底作为表面增强拉曼散射（SERS）基底，能够增强分子的拉曼散射。通过采用电子束光刻以及我们最近开发的纳米电镀协议，可以制备金纳米棒阵列SERS基底，用于检测较低分子分析物浓度，例如罗丹明6G（R6G）溶液。随着纳米棒阵列临界尺寸的减小，它们表现出具有各向异性介电常数行为的双曲超材料（HMM）特性。在我们的研究中，我们制备了两组纳米棒阵列：一组处于HMM区域（周期140 nm），另一组处于非HMM区域（周期400 nm），旨在基于R6G检测评估每组阵列的性能。利用COMSOL仿真和拉曼成像对所得结果进行比较和分析，并讨论了双曲性的作用。
英文摘要：
A plasmonic nanostructure-based substrate, serving as a surface-enhanced Raman scattering (SERS) substrate, enhances the Raman scattering of molecules. By employing an electron beam lithography followed by our recently developed nano-electroplating protocol, a gold nanorod array SERS substrate can be fabricated to detect lower molecular analyte concentrations, such as Rhodamine 6G (R6G) solution. As the critical dimensions of the nanorod array decrease, they exhibit hyperbolic metamaterial (HMM) characteristics with anisotropic permittivity behavior. In our study, we fabricated two sets of nanorod arrays: one in the HMM regime (140 nm periodicity) and the other in the non-HMM regime (400 nm periodicity), aiming to evaluate the performance of each set based on R6G detection. The obtained results are compared and analyzed using COMSOL simulation and Raman mapping and the role of hyperbolicity is discussed.
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