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All-optical controlling based on nonlinear graphene plasmonic waveguides.

Jian Li, Jin Tao, Zan Hui Chen

|September 24, 2016

Summary

We present a novel graphene plasmonic switch for ultra-fast all-optical signal processing. This compact device demonstrates a broad bandwidth and high extinction ratio, paving the way for integrated optical circuits.

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Area of Science:

Photonics and optical engineering
Materials science
Nonlinear optics

Background:

Graphene plasmonic waveguides offer unique light-matter interactions.
Nonlinear effects in graphene enable all-optical switching functionalities.
Photo-induced changes in graphene's optical properties are crucial for device operation.

Purpose of the Study:

To investigate the effective refractive index of graphene plasmonic waveguides considering linear and nonlinear effects.
To propose and analyze a non-resonant all-optical nonlinear graphene plasmonic switch.
To explore the impact of photo-induced refractive index and absorption changes on device performance.

Main Methods:

Nonlinear cross-phase modulation was used to determine the effective refractive index.

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Numerical analysis based on the dynamics of photo-induced absorption change was performed.

Device performance metrics such as bandwidth, switching speed, and extinction ratio were evaluated.

Main Results:

An ultra-compact graphene plasmonic switch (0.25 μm²) was designed.
The switch demonstrated a broad bandwidth exceeding 5 THz.
A high extinction ratio of 18.14 dB was achieved at a signal frequency of 28 THz.

Conclusions:

The proposed all-optical graphene plasmonic switch exhibits promising performance for high-speed optical signal processing.
The study highlights the potential of graphene for developing highly integrated, ultra-compact optical components.
This research contributes to advancements in all-optical communication and computing technologies.