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Visible-light Induced Reduction of Graphene Oxide Using Plasmonic Nanoparticle
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Substrate-sensitive mid-infrared photoresponse in graphene.

Marcus Freitag1, Tony Low, Luis Martin-Moreno

  • 1IBM T.J. Watson Research Center , Yorktown Heights, New York 10598, United States.

ACS Nano
|July 18, 2014
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Summary

Graphene nanoribbon photocurrent spectra reveal dual substrate interactions. These interactions enable tunable infrared photodetector responsivity by selecting specific dielectric substrates for tailored mid-infrared frequency bands.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Graphene exhibits unique electronic and optical properties, making it a promising material for infrared photodetectors.
  • Substrate interactions significantly influence the performance of graphene-based devices, particularly in the mid-infrared spectrum.
  • Understanding these interactions is crucial for optimizing graphene photodetector sensitivity and tunability.

Purpose of the Study:

  • To investigate the mid-infrared photocurrent spectra of graphene nanoribbon arrays on SiO2 dielectrics.
  • To elucidate the dual signatures of substrate interaction on graphene's photocurrent response.
  • To explore the potential for tailoring graphene photodetector responsivity through substrate selection.

Main Methods:

  • Fabrication of graphene nanoribbon arrays on SiO2 substrates.
  • Measurement of mid-infrared photocurrent spectra under varying gate voltages, nanoribbon widths, and light polarizations.
  • Theoretical modeling of hybrid polaritonic modes and phonon polariton excitation.
  • Analysis of substrate-dependent responsivity for different dielectric materials.

Main Results:

  • Observed dual photocurrent signatures attributed to hybrid graphene plasmon-phonon polariton modes and substrate-mediated phonon polaritons.
  • Demonstrated tunability of spectral features by gate voltage, nanoribbon width, and light polarization.
  • Identified fixed spectral features arising from indirect substrate heating.
  • Modeled substrate effects, showing potential for tailoring responsivity to specific mid-IR bands.

Conclusions:

  • Substrate interactions play a critical role in the mid-infrared photocurrent generation in graphene nanoribbons.
  • The choice of dielectric substrate offers a powerful method for engineering the spectral response of graphene infrared photodetectors.
  • This work provides a pathway for designing highly specific and efficient mid-infrared optoelectronic devices based on graphene.