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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
Published on: December 27, 2012
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Broadband absorber with periodically sinusoidally-patterned graphene layer in terahertz range
Optics Express
|August 10, 2017
Summary
Researchers developed a novel broadband terahertz absorber using patterned graphene. This device achieves near-unity absorption across a wide frequency range, offering promising applications in optoelectronics and sensing.
Area of Science:
- Optoelectronics
- Materials Science
- Nanotechnology
Background:
- Terahertz (THz) absorbers are crucial for various applications, including sensing and imaging.
- Achieving broadband absorption with high efficiency and wide-angle insensitivity remains a challenge.
Purpose of the Study:
- To demonstrate a novel broadband terahertz absorber with near-unity absorption.
- To investigate the absorption characteristics and tunability of a graphene-based absorber.
Main Methods:
- Utilizing a net-shaped, periodically sinusoidally-patterned graphene sheet on a dielectric spacer and metallic reflector.
- Exciting continuous plasmon resonances through gradient width modulation of the graphene.
- Analyzing absorption performance under varying incident angles, polarizations, and graphene chemical potentials.
Main Results:
- Achieved a normalized bandwidth of over 65% for 90% terahertz absorbance at normal incidence for both TE and TM polarizations (graphene chemical potential at 0.7 eV).
- Demonstrated insensitivity to incident angles up to 60° and polarizations, with peak absorbance >70%.
- Showcased flexible tunability of peak absorbance from 14% to 100% via electrostatic doping (chemical potential 0 eV to 0.8 eV).
Conclusions:
- The proposed graphene-based structure is an effective broadband terahertz absorber with excellent angular and polarization stability.
- The absorber's tunable nature and scalable design offer significant potential for applications in sensing, detecting, and optoelectronic devices across various frequency ranges.
