Far-field optical imaging of surface plasmons with a subdiffraction limited separation

Nanophotonics

article

Yifeng Xiang¹  Junxue Chen²  Xi Tang³  Ruxue Wang⁴  Qiwen Zhan⁵  Joseph R. Lakowicz⁷  Douguo Zhang³ 

[1] Key Laboratory of OptoElectronic Science and Technology for Medicine of Ministry of Education, Fujian Provincial Key Laboratory of Photonics Technology, College of Photonic and Electronic Engineering, Fujian Normal University;College of Science, Guilin University of Technology;Department of Optics and Optical Engineering, Institute of Photonics, University of Science and Technology of China;State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences;Department of Electro-Optics and Photonics, University of Dayton, 300 College Park;School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology;Department of Biochemistry and Molecular Biology, Center for Fluorescence Spectroscopy, University of Maryland School of Medicine

关键词: diffraction limit;    leakage radiation microscopy;    photonic band gap;    silver nanowire;    surface plasmon;   

DOI  :  10.1515/nanoph-2020-0500

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

When an ultrathin silver nanowire with a diameter less than 100 nm is placed on a photonic band gap structure, surface plasmons can be excited and propagate along two side-walls of the silver nanowire. Although the diameter of the silver nanowire is far below the diffraction limit, two bright lines can be clearly observed at the image plane by a standard wide-field optical microscope. Simulations suggest that the two bright lines in the far-field are caused by the unique phase distribution of plasmons on the two side-walls of the silver nanowire. Combining with the sensing ability of surface plasmons to its environment, the configuration reported in this work is capable of functioning as a sensing platform to monitor environmental changes in the near-field region of this ultrathin nanowire.

【 授权许可】

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