Dual-band switchable terahertz metamaterial absorber based on metal nanostructure

Zhang, Yubin; Cen, Chunlian; Liang, Cuiping; Yi, Zao; Chen, Xifang; Li, Meiwen; Zhou, Zigang; Tang, Yongjian; Yi, You‐Gen; Zhang, Guangfu

doi:10.1016/j.rinp.2019.102422

Cited by 51 publications

(25 citation statements)

References 13 publications

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“…A slightly decreased Eg is observed for the NaBH4-treated BiOCl samples, which could be ascribed to the lattice expansion of BiOCl crystals due to their partial reduction into Bi. It is noted that the properties of nanomaterials are highly dependent on their optical absorption properties, which can be determined by UV-vis diffuse reflectance spectroscopy measurements [50][51][52]. Figure 2a demonstrates the apparent color change of the NaBH 4 -treated BiOCl samples.…”

Section: Catalysts 2019 9 X For Peer Review 3 Of 21mentioning

confidence: 99%

NaBH4-Reduction Induced Evolution of Bi Nanoparticles from BiOCl Nanoplates and Construction of Promising Bi@BiOCl Hybrid Photocatalysts

Yan

Yang

et al. 2019

Catalysts

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In this work, we have synthesized BiOCl nanoplates (diameter 140–220 nm, thickness 60–70 nm) via a co-precipitation method, and then created Bi nanoparticles (diameter 35–50 nm) on the surface of BiOCl nanoplates via a NaBH4 reduction method. By varying the NaBH4 concentration and reaction time, the evolution of Bi nanoparticles was systematically investigated. It is demonstrated that with increasing the NaBH4 concentration (at a fixing reaction time of 30 min), BiOCl crystals are gradually reduced into Bi nanoparticles, and pure Bi nanoparticles are formed at 120 mM NaBH4 solution treatment. At low-concentration NaBH4 solutions (e.g., 10 and 30 mM), with increasing the reaction time, BiOCl crystals are partially reduced into Bi nanoparticles, and then the Bi nanoparticles return to form BiOCl crystals. At high-concentration NaBH4 solutions (e.g., 120 mM), BiOCl crystals are reduced to Bi nanoparticles completely with a short reaction time, and further prolong the treatment time leads to the transformation of the Bi nanoparticles into a two-phase mixture of BiOCl and Bi2O3 nanowires. The photodegradation performances of the samples were investigated by choosing rhodamine B (RhB) as the model pollutant and using simulated sunlight as the light source. It is demonstrated that an enhanced photodegradation performance can be achieved for the created Bi@BiOCl hybrid composites with appropriate NaBH4 treatment. The underlying photocatalytic mechanism was systematically investigated and discussed.

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Section: Catalysts 2019 9 X For Peer Review 3 Of 21mentioning

confidence: 99%

NaBH4-Reduction Induced Evolution of Bi Nanoparticles from BiOCl Nanoplates and Construction of Promising Bi@BiOCl Hybrid Photocatalysts

Yan

Yang

et al. 2019

Catalysts

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“…The dipolar resonance mode (Mode B) of the graphene metamaterials has the highest index sensitivity, while the quadrupolar mode (Mode A) displays the highest FOM due to the narrow bandwidth. Table 1 shows that the comparison of sensitivity (S) and the figure of merit (FOM) of different structures proposed in previous publications [44,56,57,58,59,60]. It can be seen clearly that the proposed structure has better sensing performance.…”

Section: Simulation Results and Discussionmentioning

confidence: 89%

“…Many gate dielectric materials such as 2D electron gas [39] indium tin oxide [40] monolayer MoS 2 [41] and ion-gel [42] have been researched in the midinfrared and THz regime. Because ion-gel has good mechanical flexibility, fatigue stability, and excellent electrochemical and thermal stability, it can be compatible with tunable graphene plasmonic devices on various substrates [43,44]. Therefore, the most appropriate and common dielectric is an ion-gel with high capacitance [45].…”

Section: Structure Design and Numerical Modelmentioning

confidence: 99%

Dual-Band Plasmonic Perfect Absorber Based on Graphene Metamaterials for Refractive Index Sensing Application

Liang

Chen

et al. 2019

Micromachines

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We demonstrate a dual-band plasmonic perfect absorber (PA) based on graphene metamaterials. Two absorption peaks (22.5 μm and 74.5 μm) with the maximal absorption of 99.4% and 99.9% have been achieved, respectively. We utilize this perfect absorber as a plasmonic sensor for refractive index (RI) sensing. It has the figure of merit (FOM) of 10.8 and 3.2, and sensitivities of about 5.6 and 17.2 μm/RIU, respectively. Hence, the designed dual-band PA-based RI sensor exhibits good sensing performance in the infrared regime, which offers great potential applications in various biomedical, tunable spectral detecting, environmental monitoring and medical diagnostics.

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“…Metamaterial-based absorbers have attracted considerable attention in the terahertz (THz) region due to their promising applications in imaging [ 4 ], biosensing [ 5 , 6 ], optical control [ 7 ], etc. Recently, the realization of dual-band terahertz absorbers based on metamaterials has been investigated [ 8 , 9 , 10 , 11 , 12 , 13 , 14 ]. Such dual-band absorbers can be utilized in dual-band transceiver systems and enhance energy absorption for imaging and biochemical sensing.…”

Section: Introductionmentioning

confidence: 99%

Design of Dual-Band Terahertz Perfect Metamaterial Absorber Based on Circuit Theory

2020

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We present a novel strategy for designing a dual-band absorber based on graphene metasurface for terahertz frequencies. The absorber consists of a two-dimensional array of patches deposited on a metal-backed dielectric layer. Using an analytical circuit model, we obtain closed-form relatinos for the geometrical parameters of the absorber and the properties of the applied materials to achieve the dual-band absorber. Two absorption bands with perfect absorption at the preset frequencies of 0.5 and 1.5 THz are achieved. The results obtained by the analytical circuit model are compared to the simulations carried out by full-wave electromagnetic field analysis. The agreement between results is very good. We demonstrate that the graphene absorber remains as the dual band for a wide range of the chemical potential. Furthermore, the recommended dual band absorber is insensitive in terms of polarization and remain within various incident angles.

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Dual-band switchable terahertz metamaterial absorber based on metal nanostructure

Cited by 51 publications

References 13 publications

NaBH4-Reduction Induced Evolution of Bi Nanoparticles from BiOCl Nanoplates and Construction of Promising Bi@BiOCl Hybrid Photocatalysts

NaBH4-Reduction Induced Evolution of Bi Nanoparticles from BiOCl Nanoplates and Construction of Promising Bi@BiOCl Hybrid Photocatalysts

Dual-Band Plasmonic Perfect Absorber Based on Graphene Metamaterials for Refractive Index Sensing Application

Design of Dual-Band Terahertz Perfect Metamaterial Absorber Based on Circuit Theory

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