An Infrared Ultra-Broadband Absorber Based on MIM Structure

We designed an infrared ultra-broadband metal–insulator–metal (MIM)-based absorber which is composed of a top layer with four different chromium (Cr) nano-rings, an intermediate media of aluminum trioxide (Al2O3), and a bottom layer of tungsten (W). By using the finite-difference time-domain (FDTD),...

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Bibliographic Details
Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2022-10, Vol.12 (19), p.3477
Main Authors: Li, Meichen, Wang, Guan, Gao, Yang, Gao, Yachen
Format: Article
Language:English
Subjects:
Absorbers
Absorption
Absorptivity
Aluminum
Aluminum oxide
Bandwidths
Broadband
Broadband transmission
Chromium
Dielectrics
Electric fields
Incidence angle
infrared
local surface plasmon resonance
Magnetic fields
metamaterial
Spectrum allocation
Surface plasmon resonance
Tungsten
ultra-broadband absorption
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Summary:We designed an infrared ultra-broadband metal–insulator–metal (MIM)-based absorber which is composed of a top layer with four different chromium (Cr) nano-rings, an intermediate media of aluminum trioxide (Al2O3), and a bottom layer of tungsten (W). By using the finite-difference time-domain (FDTD), the absorption performance of the absorber was studied theoretically. The results indicate that the average absorption of the absorber can reach 94.84% in the wavelength range of 800–3000 nm. The analysis of the electric and magnetic field indicates that the ultra-broadband absorption rate results from the effect of local surface plasmon resonance (LSPR). After that, the effect of structural parameters, metal and dielectric materials on the absorptivity of the absorber was also discussed. Finally, the effect of incidence angle on absorption was investigated. It was found that it is not sensitive to incidence angle; even when incidence angle is 30°, average absorptivity can reach 90%. The absorber is easy to manufacture and simple in structure, and can be applied in infrared detection and optical imaging.
ISSN:2079-4991
2079-4991
DOI:10.3390/nano12193477