Near-Perfect Narrow-Band Tunable Graphene Absorber with a Dual-Layer Asymmetric Meta-Grating
A near-perfect narrow-band graphene-based absorber was fabricated using a resonant system integrated with an asymmetric meta-grating at a wavelength of 1550 nm. By optimizing the gap between the two grating strips, the absorption of monolayer graphene can be increased to 99.6% owing to the strong fi...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-12-01
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| Series: | Photonics |
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| Online Access: | https://www.mdpi.com/2304-6732/10/1/14 |
| _version_ | 1797437740280709120 |
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| author | Junfang Liang Jinhua Hu Xiuhong Liu Jijun Zhao |
| author_facet | Junfang Liang Jinhua Hu Xiuhong Liu Jijun Zhao |
| author_sort | Junfang Liang |
| collection | DOAJ |
| description | A near-perfect narrow-band graphene-based absorber was fabricated using a resonant system integrated with an asymmetric meta-grating at a wavelength of 1550 nm. By optimizing the gap between the two grating strips, the absorption of monolayer graphene can be increased to 99.6% owing to the strong field confinement of the bottom zero-contrast grating (ZCG). The position of the absorption spectrum could be adjusted by tailoring the grating period or the thickness of the waveguide layer. Interestingly, absorption spectrum linewidth can be tailored by changing the thickness of the spacer layer. The accidental bound states in the continuum (BICs) are then demonstrated in the structure. Moreover, the designed structure realizes the dynamic adjustment of the absorption efficiency at a specific wavelength, which has excellent potential in integrated optical devices and systems. |
| first_indexed | 2024-03-09T11:27:00Z |
| format | Article |
| id | doaj.art-ddf2fdfcc3834f70b515971628a930cd |
| institution | Directory Open Access Journal |
| issn | 2304-6732 |
| language | English |
| last_indexed | 2024-03-09T11:27:00Z |
| publishDate | 2022-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Photonics |
| spelling | doaj.art-ddf2fdfcc3834f70b515971628a930cd2023-12-01T00:01:03ZengMDPI AGPhotonics2304-67322022-12-011011410.3390/photonics10010014Near-Perfect Narrow-Band Tunable Graphene Absorber with a Dual-Layer Asymmetric Meta-GratingJunfang Liang0Jinhua Hu1Xiuhong Liu2Jijun Zhao3School of Information and Electrical Engineering, Hebei University of Engineering, Handan 056038, ChinaSchool of Information and Electrical Engineering, Hebei University of Engineering, Handan 056038, ChinaSchool of Mathematics and Physics, Hebei University of Engineering, Handan 056038, ChinaSchool of Information and Electrical Engineering, Hebei University of Engineering, Handan 056038, ChinaA near-perfect narrow-band graphene-based absorber was fabricated using a resonant system integrated with an asymmetric meta-grating at a wavelength of 1550 nm. By optimizing the gap between the two grating strips, the absorption of monolayer graphene can be increased to 99.6% owing to the strong field confinement of the bottom zero-contrast grating (ZCG). The position of the absorption spectrum could be adjusted by tailoring the grating period or the thickness of the waveguide layer. Interestingly, absorption spectrum linewidth can be tailored by changing the thickness of the spacer layer. The accidental bound states in the continuum (BICs) are then demonstrated in the structure. Moreover, the designed structure realizes the dynamic adjustment of the absorption efficiency at a specific wavelength, which has excellent potential in integrated optical devices and systems.https://www.mdpi.com/2304-6732/10/1/14meta-gratingnarrow-bandmonolayer graphenetunable absorption spectra |
| spellingShingle | Junfang Liang Jinhua Hu Xiuhong Liu Jijun Zhao Near-Perfect Narrow-Band Tunable Graphene Absorber with a Dual-Layer Asymmetric Meta-Grating Photonics meta-grating narrow-band monolayer graphene tunable absorption spectra |
| title | Near-Perfect Narrow-Band Tunable Graphene Absorber with a Dual-Layer Asymmetric Meta-Grating |
| title_full | Near-Perfect Narrow-Band Tunable Graphene Absorber with a Dual-Layer Asymmetric Meta-Grating |
| title_fullStr | Near-Perfect Narrow-Band Tunable Graphene Absorber with a Dual-Layer Asymmetric Meta-Grating |
| title_full_unstemmed | Near-Perfect Narrow-Band Tunable Graphene Absorber with a Dual-Layer Asymmetric Meta-Grating |
| title_short | Near-Perfect Narrow-Band Tunable Graphene Absorber with a Dual-Layer Asymmetric Meta-Grating |
| title_sort | near perfect narrow band tunable graphene absorber with a dual layer asymmetric meta grating |
| topic | meta-grating narrow-band monolayer graphene tunable absorption spectra |
| url | https://www.mdpi.com/2304-6732/10/1/14 |
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