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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
Published on: December 27, 2012
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An optimized metastructure switchable between ultra-wideband angle-insensitive absorption and transmissive
Zhao Tang1, You-Ran Wu1, Si-Ying Li1
1College of Electronic and Optical Engineering & College of Flexible Electronics (Future Technology), Nanjing University of Posts and Telecommunications, Nanjing, 210023, China. hanlor@163.com.
Nanoscale
|April 10, 2024
Summary
This study presents a novel metastructure (MS) switchable between ultra-wideband (UWB) absorption and linear-to-circular (LTC) polarization conversion (PC). This tunable terahertz device offers potential for advanced communication and shielding applications.
Area of Science:
- Metamaterials and Nanophotonics
- Terahertz (THz) Technology
- Electromagnetic Wave Manipulation
Background:
- Metamaterials offer unique electromagnetic properties.
- Switchable devices are crucial for advanced terahertz applications.
- Graphene's tunable properties are key for dynamic control.
Purpose of the Study:
- To propose and theoretically study an optimized metastructure (MS).
- To achieve switchable ultra-wideband (UWB) angle-insensitive absorption and transmissive linear-to-circular (LTC) polarization conversion (PC).
- To explore the tunability of absorption and polarization conversion via chemical potential modulation.
Main Methods:
- Optimization of metastructure parameters using a thermal exchange optimization algorithm.
- Modulation of the chemical potential (μc) of embedded graphene-based hyperbolic metamaterial.
- Theoretical analysis of absorption, transmittance, axial ratio, and angular stability.
Main Results:
- Achieved UWB absorption (>0.9 absorptivity) from 7-15.45 THz (75.28% RBW) at normal incidence.
- Realized UWB LTC PC (>0.9 transmittance, <3 dB axial ratio) with 118.8% RBW.
- Demonstrated significant angular stability (up to 75° for TE, 65° for TM in absorption; 60° for PC).
- Confirmed tunability of UWB absorption by manipulating chemical potential.
Conclusions:
- The optimized MS functions as a multifunctional tunable terahertz modulator.
- The design provides a reference for developing intelligent terahertz devices.
- Potential applications include electromagnetic shielding, communication systems, and THz modulation.
