拉曼光谱
光学镊子
罗丹明6G
材料科学
粒子(生态学)
表面增强拉曼光谱
拉曼显微镜
纳米结构
镊子
光学
纳米颗粒
拉曼散射
纳米技术
光电子学
物理
荧光
地质学
海洋学
作者
Jian Ma,xiongjie ning,Yuanjie Pang,Dan Wu,Qiuhong Min,yirui wang,quan zhang,Yuanhao Lou
出处
期刊:Optics Letters
[The Optical Society]
日期:2023-02-22
卷期号:48 (5): 1204-1204
摘要
Surface-enhanced Raman spectroscopy (SERS) has enabled single nanoparticle Raman sensing with abundant applications in analytical chemistry, biomaterials, and environmental monitoring. Genuine single particle Raman sensing requires a cumbersome technique, such as atomic force microscopy (AFM) based tip-enhanced Raman spectroscopy; SERS-based single particle Raman sensing still collects an ensemble signal that samples, in principle, a number of particles. Here, we develop in situ Raman-coupled optical tweezers, based on a hybrid nanostructure consisting of a single bowtie aperture surrounded by bull's eye rings, to trap and excite a rhodamine-6G-dye-doped polystyrene sphere. We simulated a platform to ensure sufficient enhancement capability for both optical trapping and SERS of a single nanoparticle. Experiments with well-designed controls clearly attribute the Raman signal origin to a single 15-nm particle trapped at the center of a nanohole, and they also clarified the trapping and Raman enhancement role of the bull's eye rings. We claim Raman sensing of a smallest optically trapped particle.
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