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Plasmonics

, Volume 13, Issue 6, pp 1881–1888 | Cite as

Theoretical Localized Electric Field Enhancement in Tip-Enhanced Spectroscopy Using Multi-Order Radially Polarized Modes

  • Chan Lu
  • Ping Tang
  • Xiaoxu Lu
  • Qinnan Zhang
  • Shengde Liu
  • Jindong Tian
  • Liyun Zhong
Article
  • 109 Downloads

Abstract

Multi-order radially polarized modes (RPMs), including Bessel-Gaussian, Gaussian, Super Gaussian, and multi-order hollow Gaussian are respectively utilized as the illumination laser to achieve tip-enhanced spectroscopy (TES). Based on the vector diffraction theory and finite difference time domain (FDTD) analysis, we achieve the optimization of RPM illuminated TES system, including the focal spot size, focal depth, and electric field enhancement factor, in which the focal spot size of 5th order hollow Gaussian RPM is smallest (0.54λ) and the focusing depth of super Gaussian RPM is longest (4.71λ). Specially, it is found that the multi-order hollow Gaussian RPM illuminated TES system with the tip cone angle of 45° reveals better focusing ability and 40~60-fold electric field enhancement factor compared to the linearly polarized mode (LPM) illuminated TES system. These results will supply a useful reference for spectral signal enhancement of TES system.

Keywords

Radially polarized mode (RPM) Tip-enhanced spectroscopy (TES) Finite difference time domain (FDTD) Electric field enhancement factor 

Notes

Funding Information

This work was supported by National Natural Science Foundation of China grants (Nos. 61575069, 61475048, 61275015).

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Chan Lu
    • 1
  • Ping Tang
    • 1
  • Xiaoxu Lu
    • 1
  • Qinnan Zhang
    • 1
  • Shengde Liu
    • 1
  • Jindong Tian
    • 2
  • Liyun Zhong
    • 1
  1. 1.Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and DevicesSouth China Normal UniversityGuangzhouChina
  2. 2.Shenzhen Key Laboratory of Micro-Nano Measuring and Imaging in Biomedical Optics, College of Optoelectronic EngineeringShenzhen UniversityShenzhenChina

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