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

Siqi Yan, Xiaolong Zhu, Lars Hagedorn Frandsen, Sanshui Xiao, N. Asger Mortensen, Jianji Dong () and Yunhong Ding ()
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Siqi Yan: Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology
Xiaolong Zhu: Technical University of Denmark
Lars Hagedorn Frandsen: Technical University of Denmark
Sanshui Xiao: Technical University of Denmark
N. Asger Mortensen: Technical University of Denmark
Jianji Dong: Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology
Yunhong Ding: Technical University of Denmark

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: 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.

Date: 2017
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DOI: 10.1038/ncomms14411

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