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Utilization of Plasmonic and Photonic Crystal Nanostructures for Enhanced Micro- and Nanoparticle Manipulation
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Plasmonic nanostructures for shrinking structured light to access forbidden transitions.

Kyosuke Sakai1, Hiroki Kitajima1, Keiji Sasaki1

  • 1Research Institute for Electronic Science, Hokkaido University, Sapporo, Hokkaido 001-0020, Japan.

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Plasmonic tetramer nanostructures create nanoscale electric fields, enabling access to forbidden optical transitions. This breakthrough paves the way for advanced spectroscopy and sensing applications.

Keywords:
plasmonic nanostructurequadrupole transitionstructured light

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Area of Science:

  • Nanophotonics and Light-Matter Interactions
  • Plasmonics and Nanoscale Optics

Background:

  • Plasmonic nanostructures offer strong light confinement and enhancement for light-matter interactions.
  • Nanogap structures enable precise control over electric field distributions at the nanoscale.

Purpose of the Study:

  • To demonstrate a plasmonic tetramer structure capable of squeezing structured light into a nanoscale area.
  • To investigate the generation of a quadrupole-profiled structured light via plasmonic eigenmodes.
  • To explore lattice resonance effects for enhancing quadrupole fields in array architectures.

Main Methods:

  • Numerical simulations of a gold tetramer structure on a glass substrate.
  • Fabrication using electron-beam lithography to achieve ~50 nm gap sizes.
  • Investigation of plasmonic resonance in the near-infrared regime.

Main Results:

  • A plasmonic tetramer structure was shown to generate structured light with a quadrupole profile in the nanogap.
  • Electron-beam lithography enabled the creation of nanogaps supporting plasmonic resonance.
  • Array architecture demonstrated collective lattice resonance, enhancing quadrupole field intensity.

Conclusions:

  • Plasmonic nanostructures can generate structured light with specific profiles (quadrupole).
  • This capability allows access to forbidden optical transitions via strong field gradients.
  • The findings suggest new platforms for spectroscopy, sensing, and light sources leveraging multipolar transitions.