1. High-speed waveguide-coupled graphene-on-graphene optical modulators.
- Author
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Koester, Steven J. and Li, Mo
- Subjects
- *
MODULATION spectroscopy , *WAVEGUIDES , *ELECTRIC properties of graphene , *ABSORPTION spectra , *FERROMAGNETIC material fluctuations , *BANDWIDTHS - Abstract
An electro-absorption optical modulator concept based upon a dual-graphene layer is presented. The device consists of a silicon-on-insulator waveguide upon which two graphene layers reside, separated by a thin insulating region. The lower graphene acts as a tunable absorber, while the upper layer functions as a transparent gate electrode. Calculations based upon realistic graphene material properties show that 3-dB bandwidths over 120 GHz (30 GHz) are achievable at near- (λ = 1.55 μm) and mid- (λ = 3.5 μm) infrared bands. The effect of background doping and potential fluctuations on the bandwidth, modulation depth, and insertion loss are also quantified. [ABSTRACT FROM AUTHOR]
- Published
- 2012
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