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Optimized Fabrication Procedure for High-Quality Graphene-based Moiré Superlattice Devices
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High-Speed and On-Chip Optical Switch Based on a Graphene Microheater.

Shoma Nakamura1, Kota Sekiya1, Shinichiro Matano1

  • 1Department of Applied Physics and Physico-Informatics, Keio University, Yokohama 223-8522, Japan.

ACS Nano
|February 14, 2022
PubMed
Summary
This summary is machine-generated.

Graphene heaters enable ultra-fast optical switches on silicon chips. These devices demonstrate high efficiency and speed, surpassing traditional metal heaters for integrated optoelectronics.

Keywords:
grapheneracetrack resonatorssilicon photonicssilicon waveguidethermo-optic switch

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Area of Science:

  • Photonics and optoelectronics
  • Materials science
  • Nanotechnology

Background:

  • Graphene possesses unique optical, electronic, thermal, and mechanical properties, making it suitable for advanced optical devices.
  • Traditional optical switches often rely on metal heaters, limiting their speed and efficiency.

Purpose of the Study:

  • To demonstrate and characterize on-chip optical switches utilizing graphene microheaters.
  • To investigate the modulation speed and efficiency of graphene-based optical switches.
  • To assess the potential of these switches for high-performance silicon photonics.

Main Methods:

  • Electromagnetic field calculations were used to design an optimal add/drop-type racetrack resonator structure.
  • Graphene microheaters were fabricated directly onto the resonator of the optical switch.
  • Optical transmission spectra and real-time high-speed operation were measured using a near-infrared camera.

Main Results:

  • The graphene-based optical switch achieved a high wavelength tuning efficiency of 0.24 nm/mW.
  • A high heating efficiency of 7.66 K·μm³ /mW was recorded.
  • The device demonstrated high-speed modulation with 10%-90% rise and fall response times of 1.2 μs and 3.6 μs, respectively, operating at 100 kHz.

Conclusions:

  • Graphene microheaters enable significantly faster optical switching compared to traditional metal heaters.
  • The demonstrated on-chip optical switches offer high efficiency and speed, suitable for silicon photonics.
  • These advancements are expected to drive progress in integrated optoelectronic applications.