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Dynamically tunable dual plasmon-induced transparency and absorption based on a single-layer patterned graphene

Enduo Gao, Zhimin Liu, Hongjian Li

|June 6, 2019

Summary

This study demonstrates dual plasmon-induced transparency (PIT) and absorption (PIA) in graphene metamaterials. These effects are tunable, enabling applications in slow-light and light absorption devices.

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Area of Science:

Condensed Matter Physics
Metamaterials
Plasmonics

Background:

Plasmon-induced transparency (PIT) and plasmon-induced absorption (PIA) are significant optical phenomena in metamaterials.
Graphene-based metamaterials offer unique tunable properties for optical applications.

Purpose of the Study:

To achieve simultaneous dual plasmon-induced transparency (PIT) and plasmon-induced absorption (PIA) in a single-layer graphene metamaterial.
To investigate the physical mechanisms and modulation of these dual phenomena.
To explore potential applications in advanced optical devices.

Main Methods:

Utilized a single layer of graphene integrated into a metamaterial structure.
Employed electric field distribution analysis and coupled mode theory (CMT) for theoretical demonstration.
Validated theoretical results using the finite-difference time-domain (FDTD) method for simulation.

Main Results:

Successfully demonstrated simultaneous dual PIT and PIA effects.
Confirmed that both phenomena are effectively modulated by graphene's Fermi level, carrier mobility, and the surrounding environment's refractive index.
Achieved high absorption of 93.5% in the dual PIA spectrum with a carrier mobility of 0.8m²/Vs.
Observed a significant group index as high as 328.

Conclusions:

The developed graphene metamaterial effectively exhibits dual PIT and PIA.
The tunability of these phenomena by graphene properties and environmental factors is confirmed.
This work presents a novel platform for developing high-performance slow-light and light absorption functional devices.