Journal
NANOPHOTONICS
Volume 9, Issue 8, Pages 2377-2385Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2019-0381
Keywords
photonic crystal waveguides; graphene; modulators; electro-optical devices
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Funding
- Danish Council for Independent Research [9041-00333B]
- National Key Research and Development Project of China [2018YFB2201901]
- National Natural Science Foundation of China [61622502, 61805090]
- mid-chip project - VILLUM FONDEN [13367]
- Center for Silicon Photonics for Optical Communication (SPOC) - Danish National Research Foundation [DNRF123]
- China Scholarship Council (CSC) [201706160051]
- Center for Nanostructured Graphene (CNG) - Danish National Research Foundation [DNRF103]
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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/mu m with a bandwidth of 13.6 GHz, while graphene coverage length is only 1.2 mu m 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.
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