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Highly-efficient electrically-driven localized surface plasmon source enabled by resonant inelastic electron

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  • 1Department of Electrical and Computer Engineering, University of California, San Diego, 9500 Gilman Dr, La Jolla, CA, USA.

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|May 26, 2021
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This summary is machine-generated.

Researchers developed highly-efficient nanoscale plasmonic sources using resonant inelastic electron tunneling (RIET). This breakthrough overcomes previous efficiency limitations, paving the way for advanced plasmonic circuits and optical sensors.

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Area of Science:

  • Photonics and Nanotechnology
  • Quantum Electronics

Background:

  • On-chip plasmonic circuitry is crucial for high-density, high-bandwidth information processing.
  • Electrically-driven nanoscale plasmonic sources are key components, with surface plasmon (SP) sources based on inelastic electron tunneling (IET) showing promise.
  • A major limitation of IET-based SP sources is low excitation efficiency due to more efficient elastic electron tunneling.

Purpose of the Study:

  • To overcome the low efficiency barrier in IET-based SP sources.
  • To demonstrate highly-efficient electrically-driven SP sources using resonant inelastic electron tunneling (RIET).

Main Methods:

  • Implemented RIET at visible/near-infrared frequencies.
  • Utilized a TiN/Al2O3 metallic quantum well (MQW) heterostructure to support RIET.
  • Employed monocrystalline silver nanorods (AgNRs) for localized surface plasmon (LSP) generation.

Main Results:

  • Demonstrated highly-efficient electrically-driven SP sources by introducing RIET.
  • The RIET approach significantly enhances SP excitation efficiency compared to conventional IET.
  • Achieved SP generation using AgNRs coupled with the MQW heterostructure.

Conclusions:

  • RIET effectively removes the efficiency barrier in IET-based SP sources.
  • This approach promises external quantum efficiencies (EQE) approaching unity.
  • Opens new possibilities for high-performance plasmonic circuitry and advanced optical sensing applications.