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Solid-State Electrolyte-Gated Graphene in Optical Modulators.

Francisco J Rodriguez1, Diana E Aznakayeva1, Owen P Marshall1

  • 1School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, UK.

Advanced Materials (Deerfield Beach, Fla.)
|March 16, 2017
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Summary
This summary is machine-generated.

Graphene modulators achieve efficient light modulation using a solid-state supercapacitor with hafnium oxide. This breakthrough enables low-voltage operation from near-infrared to visible light, overcoming previous absorption and field challenges.

Keywords:
HfO2Pauli blockingdouble layersfield-effect transistorsgraphene heterostructures

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Area of Science:

  • Optoelectronics
  • Materials Science
  • Nanotechnology

Background:

  • Graphene's tunable absorption is ideal for light modulation across a wide spectrum.
  • Graphene modulators face limitations due to low absorption and high electric field requirements.

Purpose of the Study:

  • To demonstrate a novel solid-state supercapacitor effect for enhanced graphene modulation.
  • To enable efficient light modulation at low voltages using graphene and high-k dielectrics.

Main Methods:

  • Fabrication of electroabsorption modulators utilizing a Fabry-Perot resonator.
  • Integration of a high-k dielectric (hafnium oxide) to create a solid-state supercapacitor structure.
  • Characterization of modulation performance from near-infrared to visible wavelengths.

Main Results:

  • Achieved efficient light modulation with remarkably low operating voltages (approximately 3 V).
  • Demonstrated modulation capabilities spanning from the near-infrared to wavelengths approaching the visible spectrum.
  • Obtained modulation depths exceeding 30% for free-space beams using the Fabry-Perot resonator geometry.

Conclusions:

  • The developed solid-state supercapacitor approach significantly enhances graphene's light modulation efficiency.
  • Low-voltage operation is achieved, addressing a key challenge in graphene-based optical modulators.
  • The device shows promise for applications in optical modulation across a broad spectral range.