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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
Published on: December 27, 2012
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Tunable broadband all-silicon terahertz absorber based on a simple metamaterial structure
Applied Optics
|August 5, 2020
Summary
We developed a tunable all-silicon terahertz absorber with a cylindrical metamaterial structure. It achieves 94% average absorbance from 0.86 to 2.00 THz, showing potential for modulators and imaging devices.
Area of Science:
- Metamaterials
- Terahertz Technology
- Silicon Photonics
Background:
- Terahertz (THz) absorbers are crucial for various photonic applications.
- Developing broadband and tunable THz absorbers remains a significant challenge.
Purpose of the Study:
- To propose and demonstrate a novel modulatable all-silicon terahertz absorber.
- To achieve broadband absorption with high absorbance and tunable characteristics.
Main Methods:
- Utilized a cylindrical metamaterial structure for THz absorption.
- Employed simulation to investigate absorption mechanisms (electric and magnetic dipole modes).
- Investigated tunability using a hierarchical model for optical pump-induced carrier density.
Main Results:
- Achieved broadband absorption from 0.86 to 2.00 THz with 94% average absorbance.
- Demonstrated maximum absorption of 98% around 1.24 THz.
- Verified polarization and angle-of-incidence insensitivity.
Conclusions:
- The all-silicon terahertz absorber exhibits excellent broadband absorption and tunability.
- The design is scalable for other frequencies and holds potential for THz modulators, imaging, and energy conversion.
