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Optimized Fabrication Procedure for High-Quality Graphene-based Moiré Superlattice Devices
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Double-layer graphene optical modulator.

Ming Liu1, Xiaobo Yin, Xiang Zhang

  • 1NSF Nano-scale Science and Engineering Center (NSEC), 3112 Etcheverry Hall, University of California at Berkeley, Berkeley, California 94720, USA.

Nano Letters
|February 16, 2012
PubMed
Summary
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Researchers developed a high-performance double-layer graphene optical modulator. This device offers efficient modulation with low optical loss, ideal for advanced photonic applications.

Area of Science:

  • Photonics
  • Materials Science
  • Electrical Engineering

Background:

  • Silicon photonics often suffers from significant optical loss.
  • Graphene's unique electronic properties offer potential for low-loss optical devices.

Purpose of the Study:

  • To report a high-performance double-layer graphene optical modulator.
  • To demonstrate a novel graphene-based device architecture for efficient optical modulation.

Main Methods:

  • Fabrication of a double-layer graphene structure with an intervening oxide layer, forming a p-oxide-n junction.
  • Characterization of the optical modulator's performance, including modulation depth and drive voltage.

Main Results:

  • The graphene optical modulator operates at 1 GHz.

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  • Achieved a high modulation depth of approximately 0.16 dB/μm at a moderate drive voltage of ~5 V.
  • Demonstrated elimination of optical loss common in silicon photonics.

    • Conclusions:

    • The double-layer graphene design offers a high-performance optical modulation solution.
    • This technology presents advantages such as small footprint, low energy consumption, and low insertion loss.
    • The device is suitable for advanced photonic integrated circuits.