Open AccessElectro-absorption optical modulator using dual-graphene-on-graphene configuration
Author(s) -
Shengwei Ye,
Zi Shuai Wang,
Linfeng Tang,
Yali Zhang,
Rongguo Lu,
Yong Liu
Publication year - 2014
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.026173
Subject(s) - graphene , materials science , optical modulator , optoelectronics , extinction ratio , silicon on insulator , optics , waveguide , graphene nanoribbons , absorption (acoustics) , modulation (music) , electrode , silicon , nanotechnology , phase modulation , physics , wavelength , quantum mechanics , phase noise , acoustics , composite material
An electro-absorption optical modulator based on dual-graphene-on-graphene configuration is presented and investigated. Four graphene layers are embedded in a silicon-on-insulator (SOI) waveguide, the total metal-graphene contact resistance of this structure is reduced 50% by the graphene layers co-electrode design. By optimizing the position of each graphene-on-graphene (GOG) layer in the waveguide, a strong interaction between graphene layers and light is obtained, which leads to a significant change of the effective mode index (EMI) in the waveguide. Calculations show that an electro-absorption optical modulator can achieve 34 dB extinction ratio (ER) and 100 GHz modulation bandwidth with 5 µm-long active region and 17.6 fJ/bit consumption.