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Dynamically Tunable Plasmon-Induced Transparency in On-chip Graphene-Based Asymmetrical Nanocavity-Coupled Waveguide
Pingping Qiu1, Weibin Qiu2, Zhili Lin1
1Fujian Key Laboratory of Light Propagation and Transformation, College of Information Science and Engineering, Huaqiao University, Xiamen, 361021, China.
Nanoscale Research Letters
|May 28, 2017
Summary
Researchers developed a tunable graphene plasmonic nanostructure. This structure exhibits plasmon-induced transparency (PIT) effects, enabling applications in sensing and slow light devices.
Area of Science:
- Photonics
- Nanotechnology
- Materials Science
Background:
- Plasmon-induced transparency (PIT) is a quantum interference phenomenon.
- Graphene's unique properties offer potential for on-chip optical devices.
Purpose of the Study:
- To propose and model a graphene-based plasmonic nanostructure for tunable PIT.
- To investigate its sensing capabilities and slow light effects.
Main Methods:
- Finite element method (FEM) for numerical modeling.
- Analysis of dynamic tunability via chemical potential and geometric parameters.
Main Results:
- Demonstrated dynamic tunability of PIT windows by adjusting graphene's chemical potential and nanocavity geometry.
- Achieved a sensing sensitivity of 333.3 nm/RIU for refractive index sensing.
- Observed slow light effects within the PIT system.
Conclusions:
- The proposed graphene nanostructure enables tunable PIT effects.
- It shows promise for developing high-sensitivity on-chip refractive index sensors.
- This work contributes to the advancement of integrated nanophotonic devices.
