Slow-light-enhanced energy efficiency for graphene microheaters on silicon photonic crystal waveguides.
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-1and 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.
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, 430074 Wuhan, China.|Department of Photonics Engineering, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark.
Siqi
S
Yan
Department of Photonics Engineering, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark.|Center for Nanostructured Graphene, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark.
Xiaolong
X
Zhu
Department of Photonics Engineering, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark.
Lars Hagedorn
LH
Frandsen
Department of Photonics Engineering, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark.|Center for Nanostructured Graphene, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark.
Sanshui
0000-0001-6529-5047
S
Xiao
Department of Photonics Engineering, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark.|Center for Nanostructured Graphene, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark.
N Asger
NA
Mortensen
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, 430074 Wuhan, China.
Jianji
J
Dong
Department of Photonics Engineering, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark.
Yunhong
0000-0002-6823-4722
Y
Ding