摘要
A gold nanohole/disk array-based plasmonic fiber end-facet sensing probe is proposed and demonstrated experimentally,where the hybrid plasmon mode on the top surface used for sensing is excited by the cooperative effect of the near-field coupling between the nanohole and the nanodisk,as well as the localized surface plasmon of the nanodisk.The high-quality integration of the nanohole/disk array on the fiber end facet is achieved by combining nanoimprint lithography on a planar substrate with fiber ultraviolet(UV)-curable adhesive transfer techniques.As a result,the fabricated fiber probe experimentally exhibits a moderately high bulk refractive index sensitivity of~196.91 nm/RIU and excellent surface sensitivity.Furthermore,the specific identification and determination of protein molecules verify their sensitivity analysis capabilities for future bioassays.This work provides a feasible plasmonic excitation strategy and enables batch-manufactured technology for nanostructure-based fiber probes to break through the current bottlenecks in biosensing applications.
基金
supported by the National Natural Science Foundation of China(Nos.12274052 and 62171076)
the Natural Science Foundation of Liaoning Province(No.2022MS-134)
the Fundamental Research Funds for the Central Universities(Nos.DUT24ZD203 and DUT23BK063)。
