Tunable broadband-negative-permeability metamaterials by hybridization at THz frequencies
| Autor: | Thi Hien Nguyen, Dinh Lam Vu, Son Tung Bui, Xuan Khuyen Bui, Xuan Ca Nguyen |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science business.industry Terahertz radiation General Chemical Engineering Bandwidth (signal processing) Physics::Optics Metamaterial 02 engineering and technology General Chemistry Conductivity 021001 nanoscience & nanotechnology 01 natural sciences Kinetic inductance Semiconductor Permeability (electromagnetism) 0103 physical sciences Broadband Optoelectronics 0210 nano-technology business |
| Zdroj: | RSC Advances. 10:28343-28350 |
| ISSN: | 2046-2069 |
| DOI: | 10.1039/d0ra04612d |
| Popis: | We present a numerical study of thermo-tunable broadband-negative-permeability metamaterial based on second-order hybridization operating at the THz regime. The conventional metal is replaced by InSb, in which the temperature-dependent conductivity plays a key role in tuning the separation of second-order-hybridization magnetic-resonance modes. It is demonstrated that the hybridization in a simple disk-pair dimer can be tuned by temperature, leading to a significant broadening of the negative-permeability at THz frequencies. By increasing the temperature of the InSb patterns in the structure from 300 to 450 K, the fractional bandwidth (FBW) of the negative permeability curve varies from 4.4% to 12.9%. The thermally-increased carrier-density of InSb reduces the kinetic inductance, the main mechanism of the enhanced magnetic-resonance and the stronger activated-hybridization. Moreover, optimization for the bandwidth of negative permeability is also carried out by changing the geometrical parameters to have a FBW of 20.9%. The equivalent LC-circuit model and standard retrieval method are performed to elaborate our proposed idea. Our results would pave the way for the implementations of diversified semiconductors in tunable broadband-negative-permeability and broadband-negative-refractive-index metamaterials at THz frequencies. |
| Databáze: | OpenAIRE |
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