Thermally and electrically tunable narrowband absorber in mid-infrared region

Liu, Haotuo; Ai, Qing; Xie, Min

doi:10.1016/j.ijthermalsci.2021.107225

Cited by 29 publications

(9 citation statements)

References 66 publications

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“…The two interfaces, including array-spacer interface (interface a) and spacer-reflector interface (interface b), in F-P interference model are considered as uncoupled, where the nearfield coupling between the top Au ring array layer and the gold ground plane is neglected. 47,48 The propagation path of the incident light is expressly marked in Fig. 5.…”

Section: Resultsmentioning

confidence: 99%

Dual-wavelength switchable perfect infrared absorber based on multiple ENZ materials

Ma,

Liu,

Yan

et al. 2024

Opt. Eng.

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A dual-wavelength switchable perfect absorber, comprised of a continuous Au film, an alumina (Al 2 O 3 ) spacer, an indium tin oxide (ITO) layer, double-layer Dysprosiumdoped cadmium oxide (CdO:Dy) films, and a gold ring array from bottom to top, is numerically designed in this paper. The epsilon-near-zero (ENZ) properties are determined by the carrier concentration of these ENZ materials. As for ITO material, the carrier (electron) concentration can be electrically modified by applying a biasing voltage V . And different growth conditions afford significant variation of carrier concentration in CdO:Dy layers. Via changing the biasing voltage V , we can achieve broadband and multifrequency absorption in our infrared absorber. Especially, the proposed infrared absorber demonstrates excellent electrical regulation performance, enabling bidirectional switching of "ON" and "OFF" states at dual-wavelength. We also further reveal the absorption mechanism by establishing quasi-Fabry-Pérot cavity resonance model. In addition, it is shown that the infrared absorber can tolerate a wide range of incident angles as well as has polarization insensitive features by verification. This device has great potential in numerous optoelectronic applications, such as invisibility cloaking, sub-diffraction imaging, and thermal emission.

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Section: Resultsmentioning

confidence: 99%

Dual-wavelength switchable perfect infrared absorber based on multiple ENZ materials

Ma,

Liu,

Yan

et al. 2024

Opt. Eng.

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“…Re(ε x ) < 0 from 10.3 μm to 12.2 μm, Re(ε y ) < 0 from 11.8 μm to 18.3 μm, and Re(ε z ) < 0 from 10.0 μm to 10.4 μm. The dielectric function of Ag can be found in [27]:…”

Section: Materials Parametersmentioning

confidence: 99%

Mid-infrared broadband metamaterial absorber based on van der Waals material

Liu,

Hu,

et al. 2023

Phys. Scr.

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Van der Waals materials, such as α-phase molybdenum trioxide (α-MoO3), have promising prospects in modern optics technologies, such as nano-imaging, negative refraction, and infrared detection. Particularly, the natural hyperbolic properties of α-MoO3 make it an excellent candidate for perfect absorber. Here, we propose a design method for achieving broadband absorption based on van der Waals material (α-MoO3) in the mid-infrared band. The segmented cubic Hermite interpolation is used to generate various geometric structures. Numerical results show that the average spectral absorptance of the optimized structure is up to 0.993 in the wavelength range of 10.4-12.7 μm. The high absorption performance can be explained as the slow-light effect. The impact of incident angle on absorption performance is also investigated. Finally, we calculate the spectral absorptance of the proposed absorber when the crystal axes of α-MoO3 are rotated in the x-y plane. Our findings pave a novel path for designing broadband absorbers based on van der Waals materials, particularly in the mid-infrared band.

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“…In this case, since the metal-insulator transition of VO 2 happens at about 340 K 120 , this material is often used for non-volatile phase transitions. Phase change materials have been exploited for various applications, including optical switching 95,103,121,122 , lensing 123 , engineered absorption 111,124,125 and thermal rectification 34,114,[126][127][128][129][130][131] .…”

Section: A Phase Change Materialsmentioning

confidence: 99%