Multiband and Broadband Absorption Enhancement of Monolayer Graphene at Optical Frequencies from Multiple Magnetic Dipole Resonances in Metamaterials
Abstract It is well known that a suspended monolayer graphene has a weak light absorption efficiency of about 2.3% at normal incidence, which is disadvantageous to some applications in optoelectronic devices. In this work, we will numerically study multiband and broadband absorption enhancement of m...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2018-05-01
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| Series: | Nanoscale Research Letters |
| Subjects: | |
| Online Access: | http://link.springer.com/article/10.1186/s11671-018-2569-3 |
| _version_ | 1797708126138400768 |
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| author | Bo Liu Chaojun Tang Jing Chen Ningyan Xie Huang Tang Xiaoqin Zhu Gun-sik Park |
| author_facet | Bo Liu Chaojun Tang Jing Chen Ningyan Xie Huang Tang Xiaoqin Zhu Gun-sik Park |
| author_sort | Bo Liu |
| collection | DOAJ |
| description | Abstract It is well known that a suspended monolayer graphene has a weak light absorption efficiency of about 2.3% at normal incidence, which is disadvantageous to some applications in optoelectronic devices. In this work, we will numerically study multiband and broadband absorption enhancement of monolayer graphene over the whole visible spectrum, due to multiple magnetic dipole resonances in metamaterials. The unit cell of the metamaterials is composed of a graphene monolayer sandwiched between four Ag nanodisks with different diameters and a SiO2 spacer on an Ag substrate. The near-field plasmon hybridizations between individual Ag nanodisks and the Ag substrate form four independent magnetic dipole modes, which result into multiband absorption enhancement of monolayer graphene at optical frequencies. When the resonance wavelengths of the magnetic dipole modes are tuned to approach one another by changing the diameters of the Ag nanodisks, a broadband absorption enhancement can be achieved. The position of the absorption band in monolayer graphene can be also controlled by varying the thickness of the SiO2 spacer or the distance between the Ag nanodisks. Our designed graphene light absorber may find some potential applications in optoelectronic devices, such as photodetectors. |
| first_indexed | 2024-03-12T06:16:50Z |
| format | Article |
| id | doaj.art-7f812b0022934e6fbd674b9ae6278a07 |
| institution | Directory Open Access Journal |
| issn | 1931-7573 1556-276X |
| language | English |
| last_indexed | 2024-03-12T06:16:50Z |
| publishDate | 2018-05-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Nanoscale Research Letters |
| spelling | doaj.art-7f812b0022934e6fbd674b9ae6278a072023-09-03T02:31:19ZengSpringerOpenNanoscale Research Letters1931-75731556-276X2018-05-011311710.1186/s11671-018-2569-3Multiband and Broadband Absorption Enhancement of Monolayer Graphene at Optical Frequencies from Multiple Magnetic Dipole Resonances in MetamaterialsBo Liu0Chaojun Tang1Jing Chen2Ningyan Xie3Huang Tang4Xiaoqin Zhu5Gun-sik Park6School of Mathematics and Physics, Jiangsu University of TechnologyCenter for Optics and Optoelectronics Research, Collaborative Innovation Center for Information Technology in Biological and Medical Physics, College of Science, Zhejiang University of TechnologyCollege of Electronic and Optical Engineering and College of Microelectronics, Nanjing University of Posts and TelecommunicationsCollege of Electronic and Optical Engineering and College of Microelectronics, Nanjing University of Posts and TelecommunicationsSchool of Mathematics and Physics, Jiangsu University of TechnologySchool of Mathematics and Physics, Jiangsu University of TechnologyCenter for THz-driven Biological Systems, Department of Physics and Astronomy, Seoul National UniversityAbstract It is well known that a suspended monolayer graphene has a weak light absorption efficiency of about 2.3% at normal incidence, which is disadvantageous to some applications in optoelectronic devices. In this work, we will numerically study multiband and broadband absorption enhancement of monolayer graphene over the whole visible spectrum, due to multiple magnetic dipole resonances in metamaterials. The unit cell of the metamaterials is composed of a graphene monolayer sandwiched between four Ag nanodisks with different diameters and a SiO2 spacer on an Ag substrate. The near-field plasmon hybridizations between individual Ag nanodisks and the Ag substrate form four independent magnetic dipole modes, which result into multiband absorption enhancement of monolayer graphene at optical frequencies. When the resonance wavelengths of the magnetic dipole modes are tuned to approach one another by changing the diameters of the Ag nanodisks, a broadband absorption enhancement can be achieved. The position of the absorption band in monolayer graphene can be also controlled by varying the thickness of the SiO2 spacer or the distance between the Ag nanodisks. Our designed graphene light absorber may find some potential applications in optoelectronic devices, such as photodetectors.http://link.springer.com/article/10.1186/s11671-018-2569-3Light absorptionMonolayer grapheneMagnetic dipole resonancesMetamaterialsPlasmonics |
| spellingShingle | Bo Liu Chaojun Tang Jing Chen Ningyan Xie Huang Tang Xiaoqin Zhu Gun-sik Park Multiband and Broadband Absorption Enhancement of Monolayer Graphene at Optical Frequencies from Multiple Magnetic Dipole Resonances in Metamaterials Nanoscale Research Letters Light absorption Monolayer graphene Magnetic dipole resonances Metamaterials Plasmonics |
| title | Multiband and Broadband Absorption Enhancement of Monolayer Graphene at Optical Frequencies from Multiple Magnetic Dipole Resonances in Metamaterials |
| title_full | Multiband and Broadband Absorption Enhancement of Monolayer Graphene at Optical Frequencies from Multiple Magnetic Dipole Resonances in Metamaterials |
| title_fullStr | Multiband and Broadband Absorption Enhancement of Monolayer Graphene at Optical Frequencies from Multiple Magnetic Dipole Resonances in Metamaterials |
| title_full_unstemmed | Multiband and Broadband Absorption Enhancement of Monolayer Graphene at Optical Frequencies from Multiple Magnetic Dipole Resonances in Metamaterials |
| title_short | Multiband and Broadband Absorption Enhancement of Monolayer Graphene at Optical Frequencies from Multiple Magnetic Dipole Resonances in Metamaterials |
| title_sort | multiband and broadband absorption enhancement of monolayer graphene at optical frequencies from multiple magnetic dipole resonances in metamaterials |
| topic | Light absorption Monolayer graphene Magnetic dipole resonances Metamaterials Plasmonics |
| url | http://link.springer.com/article/10.1186/s11671-018-2569-3 |
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