首页|Plasmonic Fano-type nanocavity for double resonance enhanced SERS and optical sensing

Plasmonic Fano-type nanocavity for double resonance enhanced SERS and optical sensing

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  • NSTL
  • Elsevier
A highly tunable design for obtaining double resonance enhanced surface-enhanced Raman spectroscopy (SERS) substrates with ultrasmall vertical nanogaps is proposed by utilizing the plasmonic Fano resonances resulted from the strong coupling between the broad gap plasmon mode of the Au nanocavity and the narrow surface plasmons polaritons. A sandwiched plasmonic nanocavity of Au nanostrip grating upon a gold film separated by a dielectric spacer of nanopillar with ultrasmall nanogap is designed and simulated to obtain the double resonances at the laser excitation and Raman scattering frequencies for Raman signals detection. We demonstrate that by tuning the geometrical and material parameters of the proposed nanocavity, the double resonance frequencies and the SERS enhancement can be readily controlled. Our proposed plasmonic nanocavity exhibits very high SERS enhancement factor up to 1.1x10(10), which are promising for detect specific signals of sport doping drugs and medical diagnoses.

Surface plasmonsDouble resonanceFano resonanceSERSSport doping

Hu, Haitao、Lu, Xue、Chen, Kai、Yan, Zhendong、Cai, Pinggen、Tang, Chaojun

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Nanjing Forestry Univ, Dept Phys Educ, Nanjing 210037, Peoples R China

Nanjing Univ Informat Sci & Technol, Collaborat Innovat Ctr Atmospher Environm & Equip, Jiangsu Key Lab Atmospher Environm Monitoring & P, Nanjing 210044, Peoples R China

Nanjing Forestry Univ, Coll Sci, Nanjing 210037, Peoples R China

Zhejiang Univ Technol, Coll Sci, Ctr Opt & Optoelect Res, Collaborat Innovat Ctr Informat Technol Biol & Me, Hangzhou 310023, Peoples R China

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2022

10.1016/j.optcom.2021.127441

Optics Communications

Optics Communications

EISCI
ISSN：0030-4018
年,卷(期)：2022.502
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