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Ultra-Low-Loss Mid-Infrared Plasmonic Waveguides Based on Multilayer Graphene Metamaterials.

Chia-Chien Huang1,2, Ruei-Jan Chang2, Ching-Wen Cheng2

  • 1Institute of Nanoscience, National Chung Hsing University, Taichung 40227, Taiwan.

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|November 27, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed multilayer graphene metamaterials (MLGMTs) to guide mid-infrared light on photonic chips. This novel waveguide design doubles propagation lengths and significantly enhances light confinement for advanced optical applications.

Keywords:
field enhancementgraphenemetamaterialsmid-infrared photonicmultilayernano-opticsplasmonic waveguide

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Area of Science:

  • Photonics and Materials Science
  • Optoelectronics and Nanotechnology

Background:

  • Guiding mid-infrared (mid-IR) light is crucial for chemical sensing, thermal imaging, and subwavelength waveguiding.
  • Graphene plasmonics offer diffraction-limit-breaking confinement for mid-IR light on photonic chips.
  • Current graphene plasmonic waveguides have limited propagation lengths (~10 µm at 20 THz).

Purpose of the Study:

  • To propose and investigate a novel waveguide structure using multilayer graphene metamaterials (MLGMTs).
  • To achieve ultralow loss and enhanced light confinement for mid-IR signals in photonic integrated circuits.
  • To explore the potential of MLGMTs for high-density, tunable photonic devices.

Main Methods:

  • Designed a waveguide structure utilizing multilayer graphene metamaterials on a silicon nano-rib.
  • Investigated the coupling of plasmon polaritons to support the fundamental volume plasmon polariton mode.
  • Analyzed modal characteristics, dependence on geometric and material parameters, and fabrication imperfections.
  • Evaluated crosstalk between adjacent waveguides for high-density integration.

Main Results:

  • Achieved propagation lengths of approximately 20 µm, four times the current limitations.
  • Demonstrated an extremely tight mode area of 10⁻⁶ A₀, indicating superior light confinement.
  • MLGMTs exhibit ultralow loss compared to conventional graphene plasmonic waveguides.
  • The design shows robustness against fabrication imperfections and low crosstalk.

Conclusions:

  • The proposed MLGMT waveguide structure offers a significant advancement in mid-IR light guiding.
  • This technology enables ultralow loss and highly confined waveguiding for photonic integrated circuits.
  • The design holds promise for developing tunable, large-area photonic devices and high-density on-chip integration.