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Plasmonic Trapping and Release of Nanoparticles in a Monitoring Environment
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Coulomb Blockade Plasmonic Switch.

Dao Xiang1, Jian Wu1, Reuven Gordon1

  • 1Department of Electrical and Computer Engineering, University of Victoria , Victoria, British Columbia V8P 5C2, Canada.

Nano Letters
|March 17, 2017
PubMed
Summary
This summary is machine-generated.

Coulomb blockade enables switching plasmonic gaps between insulator and conductor states. This effect in metal-insulator-nanoparticle-insulator-metal structures offers potential for high-speed optical switching applications.

Keywords:
Coulomb blockadenanoparticlesquantum tunnellingswitching

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Area of Science:

  • Condensed matter physics
  • Plasmonics
  • Nanotechnology

Background:

  • Coulomb blockade effect modulates tunnel resistance with bias, resulting in nonlinear current response.
  • Plasmonic nanostructures are sensitive to their dielectric environment and gap size.

Purpose of the Study:

  • Investigate the optical response of a metal-insulator-nanoparticle-insulator-metal (MINIM) structure.
  • Demonstrate switching of a plasmonic gap state (insulator to conductor) using Coulomb blockade.

Main Methods:

  • Fabrication of a MINIM structure with a 0.51 nm tunneling gap.
  • Application of bias voltage to induce Coulomb blockade.
  • Optical characterization to measure changes in plasmonic resonance and optical loss.

Main Results:

  • Observed switching of the plasmonic gap from an insulating to a conducting state via Coulomb blockade.
  • Demonstrated a conductor-to-insulator transition controlled by charging energy and bias.
  • Achieved a ~70% change in normalized optical loss due to modulation of plasmonic resonance.

Conclusions:

  • Coulomb blockade can effectively control the plasmonic properties of nanoscale gaps.
  • The MINIM structure exhibits tunable optical response with potential for high-speed optical switching due to its small capacitance.