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Plasmonic sensing using Babinet's principle.

Joseph Arnold Riley1,2, Michal Horák3,4, Vlastimil Křápek3,4

  • 1School of Mathematics, Statistics and Physics, Newcastle University, Newcastle Upon Tyne, NE1 7RU, UK.

Nanophotonics (Berlin, Germany)
|December 5, 2024
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Summary
This summary is machine-generated.

This study uses complementary plasmonic nanostructures to sense material properties like refractive index. Exploiting Babinet

Keywords:
Babinetdielectric sensingnanoantennasnanoparticlesplasmonic dimersplasmonics

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Area of Science:

  • Nanophotonics and Plasmonics
  • Materials Science
  • Chemical and Biomedical Sensing

Background:

  • Sensing local material property variations (refractive index, thickness) is crucial in chemistry and biomedicine.
  • Localized surface plasmons (LSPs) in nanostructures offer environmental sensitivity for sensing applications.
  • Babinet's principle relates complementary structures, suggesting potential for enhanced sensing capabilities.

Purpose of the Study:

  • To explore Babinet's principle using complementary metal-dielectric plasmonic nanostructures (particle-dimers and aperture-dimers).
  • To investigate the physical understanding of complementary localized surface plasmon resonances (LSPRs).
  • To exploit these structures for dielectric sensing applications.

Main Methods:

  • Numerical and experimental evaluation of LSPRs in complementary plasmonic particle-dimers and aperture-dimers.
  • Utilizing electron energy loss spectroscopy (EELS) for physical characterization.
  • Assessing dielectric sensing performance in two configurations: thin film atop structures and analyte surrounding structures.

Main Results:

  • Demonstrated complementary nature of LSPRs in particle-dimer and aperture-dimer structures.
  • Achieved dielectric sensing with sensitivity up to approximately 650 nm/RIU for thin dielectric films.
  • Validated the approximate applicability of Babinet's principle for these plasmonic sensing systems.

Conclusions:

  • Complementary plasmonic nanostructures effectively exploit Babinet's principle for enhanced sensing.
  • The developed structures show promise for sensitive detection of local material property changes.
  • This work provides a foundation for designing advanced plasmonic sensors for various scientific fields.