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Related Experiment Videos

Switchable Metal-Insulator Phase Transition Metamaterials.

Ghazal Hajisalem1, Mohammadreza S Nezami1, Reuven Gordon1

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

Nano Letters
|April 6, 2017
PubMed
Summary

Researchers demonstrated switching between conducting and insulating states in a plasmon tunnel junction. This metal-insulator transition, observed via harmonic generation, enables novel switchable metamaterials for information processing.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Gap plasmon tunnel junctions exhibit unique electronic and optical properties.
  • Self-assembled monolayers (SAMs) are crucial for controlling nanoscale electronic devices.
  • Metal-insulator transitions are fundamental phenomena with technological implications.

Purpose of the Study:

  • To investigate the switching behavior of a gap plasmon tunnel junction between conducting and insulating states.
  • To understand the mechanism behind the observed hysteresis in harmonic generation.
  • To explore the potential of these systems for novel metamaterials and information processing.

Main Methods:

  • Experimental investigation of harmonic generation in plasmon tunnel junctions.
Keywords:
Phase transition materialsmetamaterialsplasmonicsquantum tunnelingsecond and third harmonic generationself-assembly

Related Experiment Videos

  • Utilizing thermally induced disorder (melting) of a two-carbon SAM.
  • Combining quantum-corrected finite-difference time-domain (FDTD) simulations with nonlinear scattering theory.

    • Main Results:

    • Observed hysteresis in second and third harmonic generation power dependence.
    • Hysteresis attributed to the "melting" of the SAM, switching between conducting and insulating states.
    • Simulations showed good agreement with experimental results for harmonic generation changes.

    Conclusions:

    • The study demonstrates a switchable metal-insulator phase transition in plasmon tunnel junctions.
    • This phenomenon is driven by thermally induced disorder in the SAM.
    • The findings pave the way for switchable metamaterials for next-generation information processing technologies.