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Tunable plasmonic resonator using conductivity modulated Bragg reflectors.

Sachinthana Pathiranage1, Sarath D Gunapala2, Malin Premaratne1

  • 1Advanced Computing and Simulation Laboratory (AχL), Department of Electrical and Computer Systems Engineering, Monash University, Clayton, Victoria 3800, Australia.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|February 25, 2021
PubMed
Summary
This summary is machine-generated.

We developed a tunable plasmonic resonator using graphene Bragg reflectors. This novel design confines light in all directions, enabling compact, versatile devices for sensing and plasmon generation.

Keywords:
Fabry–PerotFermi energygraphene Bragg reflectorsurface plasmon polaritons

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Area of Science:

  • Plasmonics
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Surface plasmon polaritons (SPPs) are crucial for nanoscale light manipulation.
  • Existing plasmonic resonators often lack tunability and compact vertical confinement.

Purpose of the Study:

  • To design a tunable plasmonic resonator with enhanced light confinement.
  • To explore graphene-based Bragg reflectors for SPP manipulation.
  • To demonstrate potential applications in sensing and plasmon generation.

Main Methods:

  • Utilizing an array of Gaussian conductivity gratings in graphene as Bragg reflectors.
  • Confining SPPs on a 2D graphene sheet between dielectric materials.
  • Analyzing resonator parameters like linewidth and quality factor.

Main Results:

  • Achieved light confinement in both horizontal and vertical directions.
  • Demonstrated a compact resonator design without traditional mirrors.
  • Showcased electrical tunability of the resonant frequency via graphene's Fermi energy modulation.

Conclusions:

  • The proposed graphene-based plasmonic resonator offers a tunable and compact platform.
  • This design overcomes limitations of conventional resonators, enabling versatile applications.
  • The tunable nature is particularly promising for plasmonic lasers and advanced sensing.