Single- and dual-band convertible terahertz absorber based on bulk Dirac semimetal

Fang, Panpan; Shi, Xinwei; Liu, Chang; Zhai, Xiang; Li, Hongjian; Wang, Lingling

doi:10.1016/j.optcom.2020.125333

Cited by 21 publications

(12 citation statements)

References 32 publications

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“…In addition, the electromagnetic field energy distribution of the terahertz absorber is clearly explained by FEM. Compared with the reported terahertz absorber, [ 27 ] the terahertz metamaterial absorber in our work has the angle‐insensitive and tunable characteristics. In addition, the results show that the absorber designed has good fabrication tolerance.…”

Section: Discussionmentioning

confidence: 86%

“…Meanwhile, the terahertz absorber achieves a dual-broadband absorption peak of 94.56% and 99.11% at 11.4 and 26.2 THz, respectively. Compared with the reported terahertz absorber, [27] the graphene-based absorber in our work can adjust the Fermi level to achieve the tunable and angle-insensitive absorption peak. In addition, in contrast to other reported graphene-based dual-band absorbers, [28][29][30] our proposed structure is simple and does not require patterning in graphene, which does not cause unnecessary contamination and damage to ultrathin graphene and reduces the fabrication difficulty in the actual production process.…”

Section: Introductionmentioning

confidence: 99%

“…Fang et al analyzed a multiband terahertz absorber. [ 27 ] The reported absorber has the characteristics of single‐band and dual‐band absorption peaks in the terahertz band. Although the terahertz absorber can achieve multipeak absorption and large angle incidence, the tunable and angle‐insensitivity terahertz absorber needs to be further studied.…”

Section: Introductionmentioning

confidence: 99%

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Graphene‐Based Angle‐Insensitive and Tunable Single‐Band and Dual‐Band Metamaterial Terahertz Absorber

Zhu

Wang

2021

Physica Status Solidi (b)

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To solve the problem of incident and controllable characteristics of the multi‐band terahertz absorber, a kind of graphene‐based metamaterial angle‐insensitive and tunable terahertz absorber is proposed. The proposed absorber has single‐band and dual‐band absorption function, and profile parameters are presented by single‐groove and dual‐groove arrays, separately. The results show that the absorber has an absorption peak of 99.30% at 16.0 THz. In addition, the absorption of the absorber can reach 94.56% and 99.11% at 11.4 THz and 26.2 THz. Electromagnetic field energy distribution and the real and imaginary parts of the graphene surface conductivity are analyzed by the finite‐element method as a function of the Fermi level and the terahertz frequency. Moreover, compared with a reported terahertz absorber, the graphene‐based absorber is angle insensitive and tunable by adjusting the Fermi levels of graphene. It is believed that the proposed absorber has great potential in the fields of time‐domain spectroscopy technology and imaging technology.

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Section: Discussionmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Graphene‐Based Angle‐Insensitive and Tunable Single‐Band and Dual‐Band Metamaterial Terahertz Absorber

Zhu

Wang

2021

Physica Status Solidi (b)

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“…Topological materials (TMs) ( Cava et al, 2013 ; Kong and Cui, 2011 ; Xu et al, 2015 ; Strambini et al, 2016 ; Wang et al, 2017 ; Banik et al, 2018 ; Kageyama et al, 2018 ; Schoop et al, 2018 ; Culcer et al, 2020 ; Kumar et al, 2020 ; Li and Xia, 2020 ; Xu et al, 2020 ) enjoy nontrivial band-crossings (BCs) in their low-energy region, giving rise to novel fermionic excitations. A series of TMs, including nodal-point ( Alcón et al, 2017 ; Fu et al, 2018a ; Kong et al, 2018 ; Jin et al, 2019a ; Jin et al, 2019b ; Wang et al, 2019 ; Fang et al, 2020 ; Zhang et al, 2020 ), nodal-line ( Chen et al, 2018 ; Zhou et al, 2018 ; Li et al, 2019 ; Liu et al, 2019 ; Sankar et al, 2019 ; Tang et al, 2019 ; Xu et al, 2019 ; Yi et al, 2019 ; Wang et al, 2020a ; Zhao et al, 2020 ), and nodal-surface ( Wu et al, 2018 ; Qie et al, 2019 ; Wang et al, 2020b ) materials, have been predicted via symmetry and first-principle analysis. Some of them have been verified via experiment.…”

Section: Introductionmentioning

confidence: 99%

Various Nodal Lines in P63/mmc-type TiTe Topological Metal and its (001) Surface State

et al. 2021

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Searching for existing topological materials is a hot topic in quantum and computational chemistry. This study uncovers P63/mmc type TiTe compound—an existing material—is a newly discovered topological metal that hosts the various type of nodal line states. Different nodal line states normally exhibit different properties; they may have their individual applications. We report that TiTe hosts I, II, and hybrid type nodal line (NL) states at its ground state without chemical doping and strain engineering effects. Specifically, two type I NLs, two hybrid-type NLs, and one Γ—centered type II NL can be found in the kz = 0 plane. Moreover, the spin-orbit coupling induced gaps for these NLs are very small and within acceptable limits. The surface states of the TiTe (001) plane were determined to provide strong evidence for the appearance of the three types of NLs in TiTe. We also provide a reference for the data of the dynamic and mechanical properties of TiTe. We expect that the proposed NL states in TiTe can be obtained in future experiments.

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“…Similarly, the relative permittivity of BDS, a material that can be considered as “3D graphene”, can also be dynamically controlled by an external gate voltage [ 8 , 9 ]. Up to now, some graphene- or Dirac-semimetal-based devices have been reported in the terahertz range [ 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ]. Nevertheless, the bandwidth of these absorbers is not wide enough, and the tuning method is relatively monotonous.…”

Section: Introductionmentioning

confidence: 99%

Dual-Tunable Broadband Terahertz Absorber Based on a Hybrid Graphene-Dirac Semimetal Structure

Yuan

Zhang

et al. 2020

Micromachines

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A dual-controlled tunable broadband terahertz absorber based on a hybrid graphene-Dirac semimetal structure is designed and studied. Owing to the flexible tunability of the surface conductivity of graphene and relative permittivity of Dirac semimetal, the absorption bandwidth can be tuned independently or jointly by shifting the Fermi energy through chemical doping or applying gate voltage. Under normal incidence, the device exhibits a high absorption larger than 90% over a broad range of 4.06–10.7 THz for both TE and TM polarizations. Moreover, the absorber is insensitive to incident angles, yielding a high absorption over 90% at a large incident angle of 60° and 70° for TE and TM modes, respectively. The structure shows great potential in miniaturized ultra-broadband terahertz absorbers and related applications.

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Single- and dual-band convertible terahertz absorber based on bulk Dirac semimetal

Cited by 21 publications

References 32 publications

Graphene‐Based Angle‐Insensitive and Tunable Single‐Band and Dual‐Band Metamaterial Terahertz Absorber

Graphene‐Based Angle‐Insensitive and Tunable Single‐Band and Dual‐Band Metamaterial Terahertz Absorber

Various Nodal Lines in P63/mmc-type TiTe Topological Metal and its (001) Surface State

Dual-Tunable Broadband Terahertz Absorber Based on a Hybrid Graphene-Dirac Semimetal Structure

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