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Tunable UV-Emitters through Graphene Plasmonics.

Jamison Sloan1, Nicholas Rivera1, Marin Soljačić1

  • 1Department of Physics, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139-4307, United States.

Nano Letters
|December 15, 2017
PubMed
Summary
This summary is machine-generated.

This study introduces a novel UV emitter using graphene plasmonics and radiative cascades to enhance light emission. Graphene

Keywords:
grapheneplasmonicsspectroscopytunabilityuv

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Area of Science:

  • Nanophotonics and Plasmonics
  • Quantum Optics and Spectroscopy
  • Materials Science and Engineering

Background:

  • Controlling light emission via optical environments is crucial in nanophotonics.
  • Graphene plasmons offer significant enhancement of transition rates in the IR-THz range.
  • A major challenge is outcoupling highly confined near-field plasmons for far-field applications.

Purpose of the Study:

  • To propose a method for enhancing far-field emission in the visible and UV range using IR plasmons.
  • To develop a novel UV emitter by combining graphene plasmonics, Purcell enhancement, and radiative cascades.
  • To investigate the tunability of the UV emitter's properties via electrical doping of graphene.

Main Methods:

  • Utilizing radiative cascade chains in multilevel emitters coupled with graphene plasmonics.
  • Employing Purcell-enhancement engineering to optimize light-matter interactions.
  • Investigating the impact of emitter-graphene distance and graphene Fermi energy on emission spectra.

Main Results:

  • Demonstrated enhancement of far-field spectra in the visible and UV range (energies > 10 eV) using IR plasmons.
  • Achieved a two-orders-of-magnitude change in far-field emission line strength by varying emitter-graphene distance.
  • Observed sharp, switch-like control over plasmonic and far-field emissions by tuning graphene's Fermi energy.

Conclusions:

  • A new type of UV emitter is proposed, leveraging graphene plasmonics and radiative cascades for enhanced far-field emission.
  • Electrical doping of graphene provides a powerful mechanism for tuning the emitter's properties.
  • The sharp dependence on Fermi energy offers precise control, enabling on/off switching of emissions.