Multiple-band terahertz perfect light absorbers enabled by using multiple metallic bars

Lou, Pengcheng; He, Yongfeng; Zhu, Huaxin; Zeng, Xiangyang; Hu, Lunzhen; Wang, Ben‐Xin

doi:10.1088/1402-4896/abe830

Cited by 12 publications

(10 citation statements)

References 50 publications

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“…Figure 7b-d show the fitting results of the three peak's frequency with the corresponding n. The sensitivity of the three peaks to the external refractive index are 72, 103.5, 139.5 GHz/RIU, respectively. As shown in Table 2, we compare the sensitivity to the refractive index of this proposed absorber with some reported results [12,36,41]. Our values are slightly higher than some of them.…”

Section: Simulation Results and Discussionmentioning

confidence: 57%

Design and Fabrication of a Triple-Band Terahertz Metamaterial Absorber

et al. 2021

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We presented and manufactured a triple-band terahertz (THz) metamaterial absorber with three concentric square ring metallic resonators, a polyethylene terephthalate (PET) layer, and a metallic substrate. The simulation results demonstrate that the absorptivity of 99.5%, 86.4%, and 98.4% can be achieved at resonant frequency of 0.337, 0.496, and 0.718 THz, respectively. The experimental results show three distinct absorption peaks at 0.366, 0.512, and 0.751 THz, which is mostly agreement with the simulation. We analyzed the absorption mechanism from the distribution of electric and magnetic fields. The sensitivity of the three peaks of this triple-band absorber to the surrounding is 72, 103.5, 139.5 GHz/RIU, respectively. In addition, the absorber is polarization insensitive because of the symmetric configuration. The absorber can simultaneously exhibit high absorption effect at incident angles up to 60° for transverse electric (TE) polarization and 70° for transverse magnetic (TM) polarization. This presented terahertz metamaterial absorber with a triple-band absorption and easy fabrication can find important applications in biological sensing, THz imaging, filter and optical communication.

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Section: Simulation Results and Discussionmentioning

confidence: 57%

Design and Fabrication of a Triple-Band Terahertz Metamaterial Absorber

et al. 2021

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“…Compared with our previously reported multiple-band absorbers [20,22,24,[27][28][29]32], the main novelty and difference of this work are as follows: firstly, this work is based on the coplanar design strategy to achieve multiple-band absorption, which is obviously better than the stacked design method [24]. It is well known that the stacked design methods require accurate alignment between layers and strict control of layer spacing, resulting in great fabrication difficulty and high manufacturing cost, while these issues should not exist in front of the coplanar design strategies.…”

Section: Introductionmentioning

confidence: 75%

“…In recent years, the design of multiple-band metamaterial absorbers [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] with special functions have gradually become a research hotspot. According to the number of resonance absorption peaks, the multipleband metamaterial absorption devices can be grouped into the categories of the dual-band absorption, triple-band absorption, quad-band absorption, and even penta-band absorption [19][20][21][22]. There are also some studies achieving quite large number of absorption bands in a narrow terahertz range, e.g., the absorber exhibit nine bands in the frequency range of 0.5 to 0.75 THz [23].…”

Section: Introductionmentioning

confidence: 99%

Quad-band terahertz metamaterial absorber using three parallel gold strips surrounded by two identical gold ring arcs

Lai¹,

Xu²,

Yang³

et al. 2022

Phys. Scr.

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Quad-band terahertz metamaterial absorber with near-perfect absorption is given in this paper. It is designed by a patterned Au layer and a continuous Au film separated by an insulating dielectric layer, of which the patterned Au layer is consisted of three parallel Au strips (a longer and two shorter) surrounded by two Au ring arcs of the same size. Four separated terahertz absorption peaks with narrow bandwidths and large absorptance are realized. The first three absorption peaks are due to the fundamental modes of the Au strips and the Au ring arcs, while the fourth absorption peak is ascribed to the excitation of three-order resonance in the Au ring arcs. The field distributions of the four absorption peaks are presented to verify their physical mechanisms. The influence of geometrical dimensions of the proposed configuration on the performance of the quad-band light absorption is discussed. Moreover, considering the potential sensing applications, the sensing performance of the proposed absorption device is also explored. The suggested scheme could provide considerable application prospects in selective thermal radiation, spectral imaging, sensing, detecting, electromagnetic stealth, etc.

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“…Since their discovery, metamaterials have been widely used in various fields [10][11][12][13]. On the one hand, combined with the ultra-thin feature of metamaterials, in line with the current pursuit of compact structure design, is of great significance to the design of optical materials; on the other hand, metamaterials, with a variety of functions, provide great significance for the study of stealth technology [14], perfect absorption [15][16][17][18][19][20], plasmonic induced transparency (PIT) [21][22][23][24], sensors [25] and so on. Nowadays, the study of metamaterial absorbers and PIT effect has extremely attracted considerable attention.…”

Section: Introductionmentioning

confidence: 99%

Study on vanadium dioxide based terahertz metamaterials with switchable functions from five-band absorption to triple-band plasmon-induced transparency

Lin¹,

Zou²,

Wu³

et al. 2023

Phys. Scr.

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A bifunctional switchable terahertz metamaterial utilizing vanadium dioxide (VO2) able to dynamically convert from multiband absorption to multiband plasmon-induced transparency (PIT) is designed, which is consisted of four different-sized metallic split rings placed on a dielectric slab backed by a continuous VO2 film. Based on unique insulator-metal phase transition properties of VO2, the present functions of designed structural could be realized by changing the temperature of VO2. When the VO2 is in the conducting phase, it possesses five discrete absorption peaks with the frequencies of 1.30 THz, 1.48 Hz, 2.07 THz, 2.46 THz and 2.72 THz with average absorbance greater than 98.0%. When the VO2 is in the insulating phase, it exhibits three obvious PIT peaks, the transmittances of them are 79.5%, 95.3% and 99.7% at the frequencies of 1.57 THz, 1.75 THz and 2.09 THz, respectively. Effects of geometric parameters on absorption and transparency are investigated. Results revealed that the dimension changes of surface patterned arrays show an important role in controlling resonance responses of absorption and transparency behavior. The switchable VO2-based metamaterial could have great potential applications in the fields of smart absorption, terahertz optical switches, filters, and slow-light devices.

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Multiple-band terahertz perfect light absorbers enabled by using multiple metallic bars

Cited by 12 publications

References 50 publications

Design and Fabrication of a Triple-Band Terahertz Metamaterial Absorber

Design and Fabrication of a Triple-Band Terahertz Metamaterial Absorber

Quad-band terahertz metamaterial absorber using three parallel gold strips surrounded by two identical gold ring arcs

Study on vanadium dioxide based terahertz metamaterials with switchable functions from five-band absorption to triple-band plasmon-induced transparency

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