Journal
MATERIALS LETTERS
Volume 219, Issue -, Pages 123-126Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2018.02.078
Keywords
Metamaterials; Plasmonic perfect absorber; All-metal nanostructure; Simulation and modeling; Sensors
Funding
- Joint Funds of the National Natural Science Foundation of China [U1435209, 61605147]
- Natural Science Foundation of Hubei province [20172017]
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We present a simple design of a dual-band plasmonic perfect absorber (PA) based on all-metal nanostructure for ultra-sensitive refractive index (RI) sensing applications in infrared region. The proposed PA is only consisted of an assembly of vertical-split-ring (VSR) structure array adhered on a continuous gold film. The numerical simulation results show that the designed PA can achieve absorbance of 99.1% and 98.8% with quality-factor (Q-factor) of 16.4 and 19.8 at 163.6 THz and 258.8 THz, respectively. The physical origin of the observed absorption is elucidated through distributions of magnetic field and power loss density at resonances. The designed PA served as a refractive index (RI) sensor can achieve sensitivity of 1518 and 959 nm/refractive index unit (RIU), respectively. The proposed dual-band PA could be a desirable candidate for applications in the RI sensing, notch filtering and the enhanced infrared spectroscopy. (C) 2018 Elsevier B.V. All rights reserved.
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