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Dynamically tunable plasmonically induced transparency in sinusoidally curved and planar graphene layers
Optics Express
|August 10, 2016
Summary
This study demonstrates plasmonically induced transparency (PIT) using patterned graphene, overcoming challenges with nanostructure fabrication. The findings suggest Autler-Townes splitting (ATS) as the mechanism, offering tunable optical properties for advanced photonic devices.
Area of Science:
- Photonics
- Plasmonics
- Graphene-based metamaterials
Background:
- Plasmonically induced transparency (PIT) typically requires precise nanostructure design and fabrication.
- Challenges exist in manufacturing nanostructures with sub-wavelength gaps for PIT devices.
Purpose of the Study:
- To propose and numerically demonstrate a novel graphene-based system for achieving PIT.
- To investigate the underlying physical mechanism and tunability of the proposed PIT system.
Main Methods:
- Numerical simulations of a dual-layer graphene system with a sinusoidally curved upper layer and a planar lower layer.
- Analytical fitting and Akaike Information Criterion (AIC) for distinguishing transparency mechanisms.
- Investigation of resonant mode tuning via geometric parameters and Fermi energy.
Main Results:
- Achieved PIT without patterning graphene sheets, using a curved and planar layer configuration.
- Identified Autler-Townes splitting (ATS) as the dominant mechanism over electromagnetically induced transparency (EIT).
- Demonstrated tunability of resonant modes through grating amplitude, interlayer spacing, and Fermi energy.
Conclusions:
- The proposed graphene system offers a viable alternative for PIT realization, circumventing nanostructure fabrication difficulties.
- The system exhibits dynamic tunability, making it suitable for applications in optical switches and plasmonic sensors.
