Jen Yi-Jun, Lin Meng-Jie
Department of Electro-Optical Engineering, National Taipei University of Technology, Taipei 106, Taiwan.
Nanomaterials (Basel). 2024 Nov 22;14(23):1871. doi: 10.3390/nano14231871.
A small amount of silver was obliquely deposited onto a polymer subwavelength grating to form a metasurface that comprised silver split-tubes. An ultra-thin silver film with a monitor-controlled thickness of 20 nm at the corner of each ridge of the grating provided the most sensitive surface-enhanced Raman scattering (SERS) measurements. An excitation laser beam that was incident from the substrate provided similar or better SERS enhancement than did the general configuration with the laser beam incident directly on the surface of the nanostructure. Near-field simulations were conducted to model the localized electric field enhancement and to quantify the SERS performance, demonstrating the effectiveness of this novel deposition method.
将少量银倾斜沉积在聚合物亚波长光栅上，以形成由银裂管组成的超表面。在光栅每个脊的拐角处，有一层厚度由监测器控制、厚度为20 nm的超薄银膜，可实现最灵敏的表面增强拉曼散射（SERS）测量。从基底入射的激发激光束所提供的SERS增强效果与激光束直接入射到纳米结构表面的常规配置相似或更好。进行了近场模拟，以模拟局部电场增强并量化SERS性能，证明了这种新型沉积方法的有效性。
