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Slow-light-enhanced energy efficiency for graphene microheaters on silicon photonic crystal waveguides

Author

Listed:
  • Siqi Yan

    (Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology
    Technical University of Denmark)

  • Xiaolong Zhu

    (Technical University of Denmark
    Center for Nanostructured Graphene, Technical University of Denmark)

  • Lars Hagedorn Frandsen

    (Technical University of Denmark)

  • Sanshui Xiao

    (Technical University of Denmark
    Center for Nanostructured Graphene, Technical University of Denmark)

  • N. Asger Mortensen

    (Technical University of Denmark
    Center for Nanostructured Graphene, Technical University of Denmark)

  • Jianji Dong

    (Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology)

  • Yunhong Ding

    (Technical University of Denmark)

Abstract

Slow light has been widely utilized to obtain enhanced nonlinearities, enhanced spontaneous emissions and increased phase shifts owing to its ability to promote light–matter interactions. By incorporating a graphene on a slow-light silicon photonic crystal waveguide, here we experimentally demonstrate an energy-efficient graphene microheater with a tuning efficiency of 1.07 nmmW−1 and power consumption per free spectral range of 3.99 mW. The rise and decay times (10–90%) are only 750 and 525 ns, which, to the best of our knowledge, are the fastest reported response times for microheaters in silicon photonics. The corresponding figure of merit of the device is 2.543 nW s, one order of magnitude better than results reported in previous studies. The influence of the length and shape of the graphene heater to the tuning efficiency is further investigated, providing valuable guidelines for enhancing the tuning efficiency of the graphene microheater.

Suggested Citation

  • Siqi Yan & Xiaolong Zhu & Lars Hagedorn Frandsen & Sanshui Xiao & N. Asger Mortensen & Jianji Dong & Yunhong Ding, 2017. "Slow-light-enhanced energy efficiency for graphene microheaters on silicon photonic crystal waveguides," Nature Communications, Nature, vol. 8(1), pages 1-8, April.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms14411
    DOI: 10.1038/ncomms14411
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