Journal
NANOSCALE RESEARCH LETTERS
Volume 13, Issue -, Pages -Publisher
SPRINGEROPEN
DOI: 10.1186/s11671-018-2569-3
Keywords
Light absorption; Monolayer graphene; Magnetic dipole resonances; Metamaterials; Plasmonics
Funding
- National Natural Science Foundation of China (NSFC) [11304159, 11104136]
- Natural Science Foundation of Zhejiang Province [LY14A040004]
- Natural Science Foundation of Jiangsu Province [BK20161512]
- Qing Lan Project of Jiangsu Province
- Open Project of State Key Laboratory of Millimeter Waves [K201821]
- NUPTSF [NY217045, NY218022]
- National Research Foundation of Korea under Young Scientist Exchange Program between The Republic of Korea and the People's Republic of China
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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.
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