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Wide Angle Dynamically Tunable Enhanced Infrared Absorption on Large-Area Nanopatterned Graphene.

Alireza Safaei^1,2, Sayan Chandra², Michael N Leuenberger^1,2,3

¹Department of Physics , University of Central Florida , Orlando , Florida 32816 , United States.

|December 12, 2018

Summary

Researchers enhanced infrared light absorption using Dirac plasmons in patterned graphene. This method achieves high absorption in the 8-12 μm band, showing potential for optoelectronic devices.

Keywords:

electrostatic tunability graphene light-matter interaction localized Dirac plasmon mid-infrared spectral domain optical cavity plasmon lifetime

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Area of Science:

Plasmonics
Optoelectronics
Materials Science

Background:

Enhancing light-matter interaction is crucial for infrared absorption.
Dirac plasmons in patterned graphene offer a route to high absorption.

Purpose of the Study:

To investigate Dirac plasmon excitation in nanopatterned monolayer graphene.
To analyze factors influencing light absorption spectra, including plasmon lifetime and incident light properties.
To demonstrate tunable infrared absorption using electrostatic gating.

Main Methods:

Fabrication of hexagonal planar arrays of nanoholes and nanodisks.
Integration of an aluminum oxide (Al2O3) layer for electrostatic tuning of the Fermi level.
Theoretical and experimental analysis of light absorption spectra under varying conditions (polarization, angle, dimensions).

Main Results:

Achieved peak absorptions of 60% (nanohole) and 90% (nanodisk) in the 8-12 μm infrared band.
Demonstrated high spectral tunability via electrostatic gating.
Showcased angular dependence of light absorption for both s- and p-polarized light.

Conclusions:

Low carrier mobility CVD-grown graphene is suitable for wide-angle infrared absorption.
The developed nanopatterned graphene structures are promising for next-generation optoelectronic devices.
This work highlights the potential of Dirac plasmons for efficient light absorption applications.