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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons

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Graphene-based active slow surface plasmon polaritons.

Hua Lu1, Chao Zeng2, Qiming Zhang3

  • 11] Centre for Micro-Photonics and CUDOS, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia [2] Centre for Micro-Photonics, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia [3] State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an 710119, China.

Scientific Reports
|February 14, 2015
PubMed
Summary

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This summary is machine-generated.

Researchers developed a novel graphene-silicon nanostructure to slow down light. This structure achieves an ultra-high slowdown factor for surface plasmon polaritons (SPPs), enabling light trapping and tunable optoelectronic devices.

Area of Science:

  • Optics and Photonics
  • Materials Science
  • Nanotechnology

Background:

  • Controlling light's group velocity is crucial for optical device development.
  • Graphene offers advantages over metals for plasmonic slow light structures due to its unique properties.

Purpose of the Study:

  • To propose and theoretically investigate a novel nanostructure for achieving ultra-high light slowdown and trapping.
  • To explore the tunability of light propagation using gate voltage in a graphene-based system.

Main Methods:

  • Theoretical modeling and numerical simulations were employed.
  • A nanostructure comprising monolayer graphene on a silicon graded grating was designed.
  • External gate voltages were applied to tune graphene and silicon properties.

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Last Updated: Apr 17, 2026

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Main Results:

  • An ultra-high slowdown factor exceeding 450 for surface plasmon polaritons (SPPs) in graphene was demonstrated.
  • Spatially resolved light trapping was achieved on a sub-wavelength scale.
  • The slowdown factor was precisely tunable via gate voltage, with a broad operational bandwidth in the mid-infrared.

Conclusions:

  • The proposed graphene-silicon nanostructure enables unprecedented control over light propagation.
  • The dynamic tunability offers a pathway for advanced optoelectronic devices like plasmonic switches and buffers.
  • This work paves the way for developing novel light-manipulating technologies at the nanoscale.