Double-layer graphene on photonic crystal waveguide electro-absorption modulator with 12 GHz bandwidth

Graphene has been widely used in silicon-based optical modulators for its ultra-broadband light absorption and ultrafast optoelectronic response. By incorporating graphene and slow-light silicon photonic crystal waveguide (PhCW), here we propose and experimentally demonstrate a unique double-layer g...

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Bibliographic Details
Published inNanophotonics (Berlin, Germany) Vol. 9; no. 8; pp. 2377 - 2385
Main Authors Cheng, Zhao, Zhu, Xiaolong, Galili, Michael, Frandsen, Lars Hagedorn, Hu, Hao, Xiao, Sanshui, Dong, Jianji, Ding, Yunhong, Oxenløwe, Leif Katsuo, Zhang, Xinliang
Format Journal Article
LanguageEnglish
Published Berlin De Gruyter 01.08.2020
Walter de Gruyter GmbH
Subjects
Bandwidths
Broadband
electro-optical devices
Electroabsorption modulators
Electromagnetic absorption
Graphene
Modulation
modulators
Optoelectronics
photonic crystal waveguides
Photonic crystals
Silicon
Waveguides
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Summary:Graphene has been widely used in silicon-based optical modulators for its ultra-broadband light absorption and ultrafast optoelectronic response. By incorporating graphene and slow-light silicon photonic crystal waveguide (PhCW), here we propose and experimentally demonstrate a unique double-layer graphene electro-absorption modulator in telecommunication applications. The modulator exhibits a modulation depth of 0.5 dB/μm with a bandwidth of 13.6 GHz, while graphene coverage length is only 1.2 μm in simulations. We also fabricated the graphene modulator on silicon platform, and the device achieved a modulation bandwidth at 12 GHz. The proposed graphene-PhCW modulator may have potentials in the applications of on-chip interconnections.
ISSN:2192-8606
2192-8614
DOI:10.1515/nanoph-2019-0381