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Bi-functional tunable reflector/high-Q absorber design using VO2 assisted graphene-coated cylinder array.
Optics Express
|June 22, 2021
Summary
A novel graphene-based device acts as a tunable reflector or absorber. Switching between functions is achieved using a vanadium dioxide (VO2) phase change material, enabling versatile optical applications.
Area of Science:
- Plasmonics
- Metamaterials
- Nanophotonics
Background:
- Graphene's unique optical properties enable plasmonic resonances.
- Tunable optical devices are crucial for advanced photonic applications.
- Phase change materials offer dynamic control over optical responses.
Purpose of the Study:
- To propose a bi-functional tunable reflector/absorber device.
- To investigate the plasmonic resonances in graphene-coated cylindrical wires.
- To demonstrate switching between reflection and absorption functionalities.
Main Methods:
- Utilizing graphene-coated cylindrical wires in a grating structure.
- Incorporating a vanadium dioxide (VO2) phase change material as a back layer.
- Analyzing the optical response through reflection and absorption coefficients.
Main Results:
- Observed multiple resonances due to hybridized localized surface plasmons.
- Achieved tunable near-perfect reflection and near-perfect absorption.
- Demonstrated switching between functionalities via VO2 metal-insulator transition.
- Exhibited a high-quality factor (Q ~ 128.86) for the absorption band due to Fano resonance.
Conclusions:
- The proposed device offers flexible, bi-functional optical control.
- The absorbing mode shows potential for high-sensitivity refractive index sensing (S ~ 9000 nm/RIU, FOM ~ 104 RIU⁻¹).
- Tunability through optical, material, and geometrical parameters allows for flexible design.
