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Plasmonic mode conversion in individual tilted 3D nanostructures.

Christoph Dreser1, Dominik A Gollmer, Godofredo Bautista

  • 1Institute for Applied Physics, University of Tübingen, Auf der Morgenstelle 10, 72076 Tübingen, Germany. christoph.dreser@uni-tuebingen.de monika.fleischer@uni-tuebingen.de.

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We demonstrate efficient plasmonic mode conversion in 3D asymmetric nanocones, enhancing electric near-fields at the tip. Advanced fabrication techniques enable tailored nanostructures for next-generation sensors and photon sources.

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Area of Science:

  • Plasmonics
  • Nanophotonics
  • Optical Spectroscopy

Background:

  • 3D asymmetric nanocones exhibit unique optical properties.
  • Plasmonic mode conversion is crucial for nanoscale light manipulation.

Purpose of the Study:

  • To investigate mode conversion in 3D asymmetric nanocones.
  • To demonstrate advanced fabrication of tilted nanostructures.
  • To enable novel plasmonic nanodevices.

Main Methods:

  • Angle-dependent linear optical spectroscopy.
  • Second-harmonic generation microscopy.
  • Computational simulations.
  • Tilted etching and tilted electron-beam lithography.

Main Results:

  • Efficient excitation of the plasmonic out-of-plane mode.
  • Significant enhancement of the electric near-field at the nanocone tip.
  • Successful fabrication of precisely tilted nanostructures.

Conclusions:

  • Mode conversion in 3D asymmetric nanocones is highly efficient.
  • Advanced fabrication processes allow for optimized plasmonic nanostructure design.
  • These findings pave the way for ultra-compact sensors and photon sources.