Using fine-structured gratings to implement mid-infrared dual-band absorbers
| Autor: | Yunxin Han, Junbo Yang, Xin He, Sen Zhang, Jinliang Jie |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Silicon business.industry Plane wave chemistry.chemical_element 02 engineering and technology Grating 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials 010309 optics Wavelength Optics Narrowband chemistry Excited state 0103 physical sciences Multi-band device 0210 nano-technology business Absorption (electromagnetic radiation) Instrumentation |
| Zdroj: | The European Physical Journal Applied Physics. 91:20501 |
| ISSN: | 1286-0050 1286-0042 |
| DOI: | 10.1051/epjap/2020200087 |
| Popis: | A dual narrowband absorber operating at mid-infrared (mid-IR) frequencies was numerically investigated. The structure consists of a fine-structured silicon grating on a gold film. Each unit cell of the fine-structured silicon grating is composed of two different silicon bars. When illuminated by a transverse-magnetic (TM) polarized plane wave, the absorber will create two absorption bands. At normal incidence, the two absorption bands have respective peak wavelengths of ∼3.864 µm and ∼3.994 µm, and respective bandwidths of ∼28 nm and ∼36 nm. The level of absorption can be higher than 0.998. It is shown that the two absorption bands are related to different silicon bars in each unit cell. Moreover, the physical origin of the two absorption bands is attributed to the different surface-plasmon-polariton (SPP) modes excited in the absorber. |
| Databáze: | OpenAIRE |
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