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Highly efficient graphene-on-gap modulator by employing the hybrid plasmonic effect
Optics Letters
|April 29, 2017
Summary
We developed a novel graphene-on-gap modulator (GOGM) with 12x higher efficiency than existing graphene modulators. This breakthrough in on-chip electro-optical modulators offers improved performance for future photonic devices.
Area of Science:
- Photonics
- Materials Science
- Electrical Engineering
Background:
- On-chip electro-optical modulators are crucial for optical communication.
- Current graphene-on-silicon modulators face limitations in modulation efficiency.
Purpose of the Study:
- To propose and investigate a highly efficient graphene-on-gap modulator (GOGM).
- To leverage the hybrid plasmonic effect for enhanced modulator performance.
Main Methods:
- Utilizing the hybrid plasmonic effect in a graphene-on-gap structure.
- Designing an efficient taper coupler for mode conversion.
- Investigating physical insights including slow light and field overlap.
Main Results:
- Achieved a modulation efficiency of up to 1.23 dB/μm, a ~12-fold improvement.
- Demonstrated a short modulation length of ~3.6 μm and low insertion loss of ~0.32 dB.
- Obtained a large modulation bandwidth of ~0.48 THz and high coupling efficiency of 91%.
Conclusions:
- The proposed GOGM significantly outperforms existing graphene modulators.
- The hybrid plasmonic effect, slow light, and field overlap are key to GOGM's high performance.
- This work paves the way for high-performance on-chip electro-optical modulators.
