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Multifunctional graphene optical modulator and photodetector integrated on silicon waveguides
Nathan Youngblood1, Yoska Anugrah, Rui Ma
1Department of Electrical and Computer Engineering, University of Minnesota , Minneapolis, Minnesota 55455, United States.
Nano Letters
|April 17, 2014
Summary
This study presents a single graphene device for efficient optical modulation and photodetection. The silicon waveguide-integrated device offers tunable near-infrared responsivity and high modulation depth at GHz bandwidth.
Area of Science:
- Optoelectronics
- Materials Science
- Photonics
Background:
- Graphene possesses unique optoelectronic properties suitable for photonic applications.
- Existing devices often focus on either modulation or detection, not both simultaneously.
Purpose of the Study:
- To demonstrate a single graphene-based device capable of simultaneous optical modulation and photodetection.
- To achieve high performance metrics including responsivity, modulation depth, and bandwidth.
Main Methods:
- Integration of a graphene device onto a silicon waveguide.
- Utilizing a graphene gate for tuning device properties.
- Characterization of photodetection responsivity and optical modulation depth.
Main Results:
- Achieved near-infrared photodetection responsivity of 57 mA/W.
- Demonstrated a modulation depth of 64% with GHz bandwidth.
- Successfully achieved simultaneous modulation of photocurrent and optical transmission.
Conclusions:
- A single graphene device can efficiently perform both optical modulation and photodetection.
- The tunable graphene gate allows for optimized performance.
- This integrated approach opens possibilities for novel optoelectronic applications.
