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Published on: September 28, 2020
Bilayer fractal structure with multiband left-handed characteristics
Qiujiao Du1, Jinsong Liu, Hongwu Yang
1Wuhan National Laboratory for Optoelectronics, School of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
We developed a novel bilayer fractal structure creating a multiband left-handed metamaterial for terahertz frequencies. This compact design enables simultaneous negative refraction for advanced terahertz devices.
Area of Science:
- Metamaterials and Nanophotonics
- Electromagnetics and Wave Propagation
- Terahertz Science and Technology
Background:
- Metamaterials offer unique electromagnetic properties not found in natural materials.
- Achieving multiband functionality in metamaterials is crucial for versatile applications.
- Terahertz frequencies present opportunities for novel sensing and communication technologies.
Purpose of the Study:
- To design and investigate a bilayer fractal structure for multiband left-handed metamaterial realization.
- To explore the electromagnetic properties of H-fractal pairs at terahertz frequencies.
- To demonstrate simultaneous negative refraction for parallel and perpendicular polarizations.
Main Methods:
- Numerical simulations were employed to analyze the electromagnetic properties of the proposed structure.
- The structure consists of metallic H-fractal pairs separated by a dielectric layer.
- Analysis focused on the response to electromagnetic wave normal incidence.
Main Results:
- The bilayer fractal structure exhibits left-handed metamaterial properties.
- Simultaneous negative refraction was observed at multiple frequencies for both polarizations.
- Specific frequencies for negative refraction: 0.10 & 0.15 THz (parallel), 0.19 & 0.38 THz (perpendicular).
Conclusions:
- The developed H-fractal based structure is a viable candidate for multiband left-handed metamaterials.
- The design is suitable for compact device realization at terahertz frequencies.
- This work contributes to the advancement of terahertz metamaterial applications.
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