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Directional light beams by design from electrically driven elliptical slit antennas.

Shuiyan Cao1, Eric Le Moal1, Quanbo Jiang2

  • 1Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Univ Paris Sud, Université Paris-Saclay, F-91405 Orsay, France.

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|September 27, 2018
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Summary

We demonstrate low-energy light beam generation using elliptical microstructures and surface plasmon polaritons (SPPs). The emission direction is controlled by the microstructure

Keywords:
elliptical antennainelastic electron tunnelingoptical antennaplasmonicsscanning tunneling microscopysurface plasmon polariton

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Area of Science:

  • Plasmonics and Nanophotonics
  • Optoelectronics

Background:

  • Surface plasmon polaritons (SPPs) enable light manipulation at the nanoscale.
  • Electrical generation of light offers potential for miniaturized optical devices.

Purpose of the Study:

  • To report on the low-energy, electrical generation of directional light beams.
  • To investigate the use of planar elliptical microstructures as optical antennas.
  • To demonstrate control over beam emission direction via microstructure geometry.

Main Methods:

  • Fabrication of planar elliptical microstructures (elliptical slits in gold films).
  • Electrical generation of SPPs using inelastic electron tunneling with a scanning tunneling microscope (STM).
  • Characterization of light emission from the elliptical structures.

Main Results:

  • Successful generation of light beams from elliptical microstructures.
  • Demonstrated control of emission direction based on ellipse eccentricity.
  • Utilized a simple, broadband optical antenna design.

Conclusions:

  • Elliptical microstructures can act as efficient optical antennas for directional light emission.
  • Electrical SPP excitation provides a pathway for low-energy, on-demand light generation.
  • This approach offers a simple method for creating tunable nanoscale light sources.