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  • Received: Feb. 12, 2020

    Accepted: May. 25, 2020

    Posted: May. 26, 2020

    Published Online: Jun. 30, 2020

    The Author Email: Jinfeng Zhu (nanoantenna@hotmail.com), Zhilin Yang (zlyang@xmu.edu.cn)

    DOI: 10.1364/PRJ.390343

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    Min Gao, Weimin Yang, Zhengying Wang, Shaowei Lin, Jinfeng Zhu, Zhilin Yang. Plasmonic resonance-linewidth shrinkage to boost biosensing[J]. Photonics Research, 2020, 8(7): 07001226

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Photonics Research, Vol. 8, Issue 7, 07001226 (2020)

Plasmonic resonance-linewidth shrinkage to boost biosensing

Min Gao1,2,3, Weimin Yang1, Zhengying Wang2, Shaowei Lin4, Jinfeng Zhu2,5,*, and Zhilin Yang1,6,*

Author Affiliations

  • 1Department of Physics, Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices, Jiujiang Research Institute, Xiamen University, Xiamen 361005, China
  • 2Institute of Electromagnetics and Acoustics, Xiamen University, Xiamen 361005, China
  • 3College of Physics Science and Technology, Xinjiang University, Urumqi 830046, China
  • 4The First Affiliated Hospital of Xiamen University, Xiamen 361003, China
  • 5e-mail: nanoantenna@hotmail.com
  • 6e-mail: zlyang@xmu.edu.cn

Abstract

Coupling effects of surface plasmon resonance (SPR) induce changes in the wavelength, intensity, and linewidth of plasmonic modes. Here, inspired by coupling effects, we reveal an abrupt linewidth-shrinking effect in 2D gold nanohole arrays at the azimuthal angle of 45° arising from the interference of two degenerate SPR modes. We further demonstrate the biosensing capability under various excitation conditions for detecting the critical molecular biomarker of prostatic carcinoma, and achieve the maximum sensitivity at this angle. Our study not only enhances the understanding toward plasmonic resonance-linewidth shrinking, but also provides a promising strategy to greatly improve biosensing performance by light manipulation on plasmonic nanostructures.

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