Polarization-insensitive plasmon nanofocusing with broadband interference modulation for optical nanoimaging  

作　　者：Shaobo Li Fei Wang Ze Zhang Shuhao Zhao Chengsheng Xia Peirui Ji Xiaomin Wang Guofeng Zhang Tao Liu Feng Chen Shuming Yang 

机构地区：[1]State Key Laboratory for Manufacturing Systems Engineering,Xi’an Jiaotong University,Xi’an 710049,China [2]School of Electronic Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,China

出　　处：《Nano Research》2023年第7期9990-9996,共7页纳米研究（英文版）

基　　金：The authors would like to acknowledge the support by the National Science Fund for Distinguished Young Scholars(No.52225507);the National Key Research and Development Program of China(No.2021YFF0700402);the Key Research and Development Program of Shaanxi Province(No.2021GXLH-Z-029).

摘　　要：Delivering light to the nanoscale using a flexible and easily integrated fiber platform holds potential in various fields of quantum science and bioscience.However,rigorous optical alignment,sophisticated fabrication process,and low spatial resolution of the fiber-based nanoconcentrators limit the practical applications.Here,a broadband azimuthal plasmon interference nanofocusing technique on a fiber-coupled spiral tip is demonstrated for fiber-based near-field optical nanoimaging.The spiral plasmonic fiber tip fabricated through a robust and reproducible process can reverse the polarization and modulate the mode field of the surface plasmon polaritons in three-dimensionally azimuthal direction,resulting in polarization-insensitive,broad-bandwidth,and azimuthal interference nanofocusing.By integrating this with a basic scanning near-field optical microscopy,a high optical resolution of 31 nm and beyond is realized.The high performance and the easy incorporation with various existing measurement platforms offered by this fiber-based nanofocusing technique have great potential in near-field optics,tip-enhanced Raman spectroscopy,nonlinear spectroscopy,and quantum sensing.

关 键 词：azimuthal asymmetries plasmonic nanoconcentrator fiber-based plasmonic tip near-field scanning optical microscopy 

分 类 号：TB383[一般工业技术—材料科学与工程]