Dual-guiding-layer resonance structure with an embedded metasurface for quasi-critical coupling without a perfect mirror
Autor: | Gyeong Cheol Park, Kwangwook Park |
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Jazyk: | angličtina |
Rok vydání: | 2020 |
Předmět: |
Materials science
Fabrication Silicon Silicon photonics chemistry.chemical_element lcsh:Medicine 02 engineering and technology 01 natural sciences Article law.invention 010309 optics Optics law 0103 physical sciences Optical materials and structures Absorption (electromagnetic radiation) lcsh:Science Coupling Range (particle radiation) Multidisciplinary Photonic devices Graphene business.industry lcsh:R 021001 nanoscience & nanotechnology Perfect mirror Wavelength Optics and photonics chemistry lcsh:Q 0210 nano-technology business |
Zdroj: | Scientific Reports, Vol 10, Iss 1, Pp 1-10 (2020) Scientific Reports Park, G C & Park, K 2020, ' Dual-guiding-layer resonance structure with an embedded metasurface for quasi-critical coupling without a perfect mirror ', Scientific Reports, vol. 10, no. 1, 16014 . https://doi.org/10.1038/s41598-020-72983-8 |
ISSN: | 2045-2322 |
Popis: | We propose an all-dielectric quasi-one-port resonance structure that achieves near perfect absorption without the use of a back mirror. The structure mainly consists of a high-refractive-index silicon metasurface and surrounding high-refractive-index guiding layers. The dual-guiding-layer (DGL) structure has high background reflectance and is designed to have a ratio of two decay rates into the upper and lower regions within a wider range. When an absorbing material is introduced into a DGL system, it can be designed to achieve a near critical-coupling condition by reducing the constraints in the two decay rates. By using single-layer graphene as an absorbing material, the DGL resonance structure shows an absorption of ~ 97% and a phase change of ∼ 0.95π near the wavelength of 1550 nm, confirming quasi-critical coupling. The optimized DGL structure is relatively insensitive to potential fabrication imperfections, and consequently, the expected average peak wavelength and absorption are obtained as 1549.29 nm and 96.74%, respectively. Angle-dependent absorption confirms that maximum absorption occurs under normal incidence. The DGL absorber is also designed to cover the whole C-band region, in order to meet the quasi-critical-coupling condition. All mode profiles are similarly quasi-symmetric along the metasurface due to the same DGL resonance mechanism. |
Databáze: | OpenAIRE |
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