Abstract
This paper proposes a perfect metamaterial absorber based on a dielectric−dielectric−metal structure, which realizes ultra-narrowband dual-band absorption in the near-infrared band. The maximum Q factor is 484. The physical mechanism that causes resonance is hybrid coupling between magnetic polaritons resonance and plasmon resonance. At the same time, the research results show that the intensity of magnetic polaritons resonance is much greater than the intensity of the plasmon resonance. By changing the structural parameters and the incident angle of the light source, it is proven that the absorber is tunable, and the working angle tolerance is 15°. In addition, the sensitivity and figure of merit when used as a refractive index sensor are also analyzed. This design provides a new idea for the design of high-Q optical devices, which can be applied to photon detection, spectral sensing, and other high-Q multispectral fields.
Highlights
Metamaterials are composite structures made of artificial unit structures, which can realize sensing [1,2], photocatalysis [3–5], thermal emitters [6], infrared detection and imaging equipment [7], and other applications [8,9]
The traditional metamaterial absorber is generally composed of a metal−dielectric−metal (MDM) structure, and different absorption characteristics are obtained by designing different microstructures on the top metal [10–15]
It can be seen that this absorber can obtain double-band perfect absorption in theinnearIt can be seen that this absorber can obtain double-band perfect absorption the infrared band range of 800–1300 nm
Summary
Metamaterials are composite structures made of artificial unit structures, which can realize sensing [1,2], photocatalysis [3–5], thermal emitters [6], infrared detection and imaging equipment [7], and other applications [8,9]. The traditional metamaterial absorber is generally composed of a metal−dielectric−metal (MDM) structure, and different absorption characteristics are obtained by designing different microstructures on the top metal [10–15]. Recently achieved perfect absorption with an absorption bandwidth of 1.3 nm width of 1.3 nm through a dielectric structure set on a metal substrate [33]. Another exthrough a dielectric structure onmedium a metal to substrate [33].ofAnother ample is that by adding a layerset of Si the surface the metalexample grating is to that formby a adding a layer ofstructure, Si medium to the of the metal grating to form complementary complementary. The resonance achieves dual-band perfect absorption in the near-infrared range.
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