Design of multiple-frequency-band terahertz metamaterial absorbers with adjustable absorption peaks using toothed resonator

Wang, Ben‐Xin; Duan, Guiyuan; Xu, Chongyang; Jiang, Jieying; Xu, Wei; Pi, Fuwei

doi:10.1016/j.matdes.2023.111586

Cited by 57 publications

(8 citation statements)

References 53 publications

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“…GST has so far been used in its various combinations like GeSb 2 Te 4 (GST124), Ge 3 Sb 2 Te 6 (GST326) where in its general form we can obtain many other combinations using the formula ((Ge) m (Sb 2 Te 3 ) n ). GST has been explored widely due to its fast switching and higher thermal stability [35,36]. Guo Linyang et al proposed the temperature-sensitive tunable metamaterial based on GST particles for Terahertz applications, maintaining resonance performance while achieving absorption window conversion with temperature variation.…”

Section: Introductionmentioning

confidence: 99%

A functionality switchable meta-device: from perfect reflection to perfect absorption

et al. 2023

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Tunable meta-devices trigger immense interest in many applications like biosensing, thermal camouflage, radiative cooling, thermal emitting, infrared imaging, and energy harvesting. This paper presents a polarization-independent broadband tunable absorbing and reflecting meta-device using a phase change material Germanium-Antimony-Tellurium (GST). The proposed design manifests high absorptivity >80% over a broadband range of wavelength spanning the mid-IR regime. Furthermore, by changing the phase of GST material from crystalline to amorphous with the help of external stimuli, the absorbance of the device was reduced to almost zero in the range from 4 µm to 12 µm. To previse the angular constancy of the meta-absorber, the absorptivity was scrutinized under different incidence angles in both transverse magnetic (TM) and transverse electric (TE) polarizations which manifested the robustness of the proposed meta-absorber. As a result, the proposed absorber has tunable broadband absorbance and angular stability, which proclaim great potential in applications such as thermal camouflage, radiation detection, thermal emitter, and stealth technology, etc.

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Section: Introductionmentioning

confidence: 99%

A functionality switchable meta-device: from perfect reflection to perfect absorption

et al. 2023

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“…As a novel twodimensional material, the successful discovery of graphene has opened a very outstanding field of research. In the past decade, graphene is widely used by scientific researchers in various applications and devices with its excellent electrical and optical properties, such as a series of modulators, sensors, optical switches, optical loop, slow light devices and so on [21][22][23][24][25][26][27][28]. These terahertz devices based on graphene surface plasma and their related applications have become one of the international research hotspots, and have very broad application prospects in biomedicine, information technology, new energy and other fields [29][30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Optical tunable multifunctional applications based on graphene metasurface in terahertz

Chen

et al. 2023

Phys. Scr.

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Due to the superior properties of graphene and the application potential of surface plasmons, the research of graphene surface plasmons has become a hot research direction. Based on the surface plasmons of graphene, this paper has done some researches on the plasma induced transparency, absorption, and slow light effect. The main work and results of this paper are as follows: we have designed a graphene-based metamaterial structure that can realize a dual plasma induced transparency (PIT) effect. The specific structure is formed by the periodic arrangement of graphene bands (as bright mode) and band edge microchips (as bright mode). We use the finite-difference time-domain (FDTD) method to study the dual PIT effect from the aspect of numerical simulation, and then further study the phenomenon of this device from the theoretical fitting of the coupled mode theory (CMT). The CMT model explores the physical mechanism of dual PIT spectral line and obtains a good fitting result. By studying the formation mechanism of the dual PIT effect, we have found that the graphene band as a bright mode interacts with the band edge microchip as a dark mode, and then the dual PIT is formed by destructive interference of the bright and dark modes. In order to better external modulation, the structure only studies the modulation effect caused by the change of Fermi level affected by the external voltage of graphene. Moreover, we also have studied the slow light performance of this structure, and the slow light coefficient reached 0.236 picoseconds (ps). This proposed coupling system of dual PIT effect has important research significance in optical switches, optical loop, and slow light devices.

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“…To realize broad bandwidth, two perpendicular antisymmetric resonators are used 19 . As multiple frequency‐band increase, structure deformation as a toothed resonator, 20 split ring resonator, 21 perforated square‐patch, 22 and so on the tenability of the absorber can be changed by changing material conductivity 23 . This absorber also lacks tenability, unlike the graphene absorber 24 …”

Section: Introductionmentioning

confidence: 99%

An ultrathin triple‐band absorber for tuneable THz bio‐sensing

Deekonda

Sahu

Panda

et al. 2023

Micro & Optical Tech Letters

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In this paper, a multimode terahertz absorber is implemented using an ultrathin silicon ring with varying multimodal resonance. The rectangular silicon ring is providing three resonances with creating electromagnetic dipoles. The altering of these resonances is explicitly controlled with the help of a circular graphene ring. The graphene ring is used in the centre for tenability and to achieve perfect absorption. An equivalent circuit model is also presented and verified for the proposed structure. The design is intended to measure the glucose percentage in water. In addition, this can be used as a biosensor for the detection of malaria parasite percentage in water. A few important parameters like sensitivity and quality factors are considered to evaluate the performance of the said design. The sensitivity with analyte thickness is found to be 0.445 THz TU−1, 0.4255 THz TU−1, and 0.4305 THz TU−1. The corresponding quality factor is noted for the lower, middle, and upper bands as 235, 653, and 264 respectively. Further, the sensitivity and quality factors were measured just by changing the refractive index. The new estimated values are 0.480 THz RIU−1, 0.403 THz RIU−1, and 0.562 THz RIU−1 and corresponding quality factors are 203, 555, and 261 for lower, middle, and upper bands respectively. The design is also expected to flourish as a polarization‐insensitive absorber.

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Design of multiple-frequency-band terahertz metamaterial absorbers with adjustable absorption peaks using toothed resonator

Cited by 57 publications

References 53 publications

A functionality switchable meta-device: from perfect reflection to perfect absorption

A functionality switchable meta-device: from perfect reflection to perfect absorption

Optical tunable multifunctional applications based on graphene metasurface in terahertz

An ultrathin triple‐band absorber for tuneable THz bio‐sensing

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