A flat-based plasmonic fiber probe for nanoimaging  

作　　者：Fei Wang Shaobo Li Shuhao Zhao Ze Zhang Peirui Ji Chengsheng Xia Biyao Cheng Guofeng Zhang Shuming Yang 

机构地区：[1]State Key Laboratory for Manufacturing Systems Engineering,International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technologies,Xi’an Jiaotong University,Xi’an 710049,China

出　　处：《Nano Research》2023年第5期7545-7549,共5页纳米研究（英文版）

基　　金：the National Science Fund for Distinguished Young Scholars(No.52225507).

摘　　要：The difficulty of obtaining high-intensity localized light spots for optical probes leads to their lack of good applications in nanoimaging.Here we demonstrate a Fabry–Pérot resonance flat-based plasmonic fiber probe(FPFP).The simulation results show that the probe can obtain a nanofocusing spot at the tip with the radially polarized mode.The Fabry–Pérot interference structure is used to control the plasmon propagation on the surface of the probe,it effectively improves the local spot intensity at the tip.Furthermore,the experimental results verify that the FPFP(tip curvature radius is 20 nm)prepared by chemical etching method can obtain a nanofocusing spot at the tip.The nanoimaging of the gold slit structure demonstrates the nanoimaging capability of the FPFP,the 36.9 nm slit width is clearly identified by the FPFP.

关 键 词：optical probe nanoimaging controlling plasmon propagation nanofocusing local electric field enhancement 

分 类 号：TB383[一般工业技术—材料科学与工程]