A Mid-Infrared Narrowband Absorber Based on a Subwavelength Fine-Structured Silicon–Gold Metagrating
| Autor: | Sen Zhang, Jinliang Jie, Xin He, Junbo Yang, Yunxin Han |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Silicon perfect absorber chemistry.chemical_element 02 engineering and technology Grating 01 natural sciences lcsh:Technology 010309 optics lcsh:Chemistry Narrowband grating Stack (abstract data type) 0103 physical sciences Figure of merit General Materials Science Absorption (electromagnetic radiation) Instrumentation lcsh:QH301-705.5 Fluid Flow and Transfer Processes business.industry lcsh:T Process Chemistry and Technology General Engineering mid-infrared 021001 nanoscience & nanotechnology lcsh:QC1-999 Computer Science Applications narrowband Wavelength chemistry lcsh:Biology (General) lcsh:QD1-999 lcsh:TA1-2040 Optoelectronics 0210 nano-technology business lcsh:Engineering (General). Civil engineering (General) Refractive index lcsh:Physics |
| Zdroj: | Applied Sciences, Vol 9, Iss 23, p 5022 (2019) Applied Sciences Volume 9 Issue 23 |
| ISSN: | 2076-3417 |
| Popis: | A subwavelength fine-structured silicon&ndash gold metagrating was designed for realizing mid-infrared (mid-IR) narrowband absorbers. The metagrating consisted of a silicon grating on the stack of a gold film and a quartz substrate. The silicon grating consisted of two periodically arranged silicon strips in each unit cell. The numerical results reveal that perfect absorption of the traverse-magnetic (TM) polarized light at a wavelength of 4.071 &mu m can be achieved, with an absorption rate of ~99.2% and an absorption full-width at half-maximum (FWHM) bandwidth of ~31 nm. Thus, the proposed structure is useful for the spectral control of mid-IR signals. When used as a refractive index sensor, the structure has a measuring range of 1.0&ndash 2.0 with a quasi linear response, with a figure of merit (FOM) of ~103. |
| Databáze: | OpenAIRE |
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