Multi-band absorption induced by near-field coupling and defects in metamaterial
| Autor: | Bui Son Tung, Vu Dinh Lam, Bui Xuan Khuyen, Le Dac Tuyen, Dang Hong Luu |
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| Rok vydání: | 2018 |
| Předmět: |
Coupling
Materials science business.industry Terahertz radiation Metamaterial Resonance 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Resonator Interference (communication) Excited state 0103 physical sciences Optoelectronics Electrical and Electronic Engineering 010306 general physics 0210 nano-technology business Absorption (electromagnetic radiation) |
| Zdroj: | Optik. 156:811-816 |
| ISSN: | 0030-4026 |
| Popis: | In this work, we propose two approaches to obtain a multi-band metamaterial perfect absorber (MPA) in the THz region. The first one is based on the near-field coupling between bright and dark resonators in the structure of MPA. A dark resonance is excited by the near-field of bright resonance and, then, interference between these resonances happens, giving a dual-band absorption. For the next step, the second approach is applied by creating defects in MPA structure. Due to the existence of defects, an additional perfect absorption resonance appears next to the second resonance. Our work might contribute another way to create future THz devices using multi-band MPA. |
| Databáze: | OpenAIRE |
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