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Fano Resonance in an Electrically Driven Plasmonic Device.

Yuval Vardi1, Eyal Cohen-Hoshen1, Guy Shalem1

  • 1Department of Condensed Matter Physics, Weizmann Institute of Science , Rehovot 76100, Israel.

Nano Letters
|December 31, 2015
PubMed
Summary

We developed a plasmonic device using gold nanoparticles that generates light via electrical current. This light emission, controlled by voltage, exhibits a unique Fano resonance.

Keywords:
Electrically driven plasmonFano resonancemetallic nanoparticlesphotonic devicesplasmonicssingle electron transistor

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Area of Science:

  • Plasmonics
  • Nanotechnology
  • Quantum Optics

Background:

  • Plasmonic devices offer unique light-matter interactions.
  • Controlling plasmon generation and emission is crucial for nanophotonic applications.

Purpose of the Study:

  • To present an electrically driven plasmonic device for controlled light emission.
  • To investigate the spectral properties and underlying physics of the emitted light.

Main Methods:

  • Fabrication of a gold nanoparticle device between two electrodes.
  • Electrical characterization of tunneling current and conductance at low temperatures.
  • Finite-difference time-domain (FDTD) calculations for optical simulations.

Main Results:

  • Electrically generated plasmons decay radiatively, with emission energy dependent on applied voltage.
  • A sharp, asymmetrical dip identified as a Fano resonance was observed in the emission spectrum.
  • Fano resonance attributed to interference between nanoparticle and electrode dipolar fields, controllable via structural parameters.

Conclusions:

  • The presented device enables voltage-controlled plasmon generation and radiative decay.
  • The observed Fano resonance provides a mechanism for spectral tailoring in plasmonic devices.
  • Structural control over Fano resonance opens avenues for designing advanced nanophotonic components.