A high <i>Q</i>-factor dual-band terahertz metamaterial absorber and its sensing characteristics

Wang, Dongxu; Xu, Kai-Da; Luo, Siyuan; Cui, Yuqing; Zhang, Liuyang; Cui, Jianlei

doi:10.1039/d2nr05820k

Cited by 52 publications

(17 citation statements)

References 61 publications

(62 reference statements)

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“…Terahertz metamaterial absorber has been studied for nearly a decade, but due to the difficulty of antenna preparation, it is difficult to test at higher frequency bands, so it is mainly concentrated in the stage of simulation design. In recent years, the passive absorbers also have a great development, such as high Q-factor dual-band absorber from Wang et al [103], the multiband terahertz absorber covering entire terahertz band from Ye et al [104], dual-band perfect absorber from Zhu et al [105]. For the active absorber, most of researcher chose VO 2 , BDS, and graphene as their tunable material to achieve the absorbing adjustability or multifunction.…”

Section: Metamaterials Absorber In Terahertzmentioning

confidence: 99%

Advancements in tunable and multifunctional metamaterial absorbers: a comprehensive review of microwave to terahertz frequency range

Liu,

Dong,

Sabri

et al. 2024

J. Phys. D: Appl. Phys.

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Over the past two decades, metamaterial absorbers have undergone significant advancements, evolving from microwave single-frequency designs to multi-frequency and broadband absorption, extending into the terahertz band. These absorbers have transitioned from unadjustable to adjustable and multifunctional configurations, enabled by the integration of adjustable materials, mechanical structures, and semiconductor devices. This article provides a comprehensive review of the progress achieved in the microwave to terahertz frequency range over the last five years. Key aspects covered include the absorbing mechanism of metamaterials in the microwave frequency band, with absorption efficiencies exceeding 90% for specific frequency ranges. The development of adjustable absorbers allows for frequency tunability within ±10% of the central frequency, while multifunctional absorbers enable concurrent control over absorption and reflection properties. In the terahertz regime, advanced electromagnetic simulations have led to absorber designs with bandwidths exceeding 50% of the central frequency, resulting in absorption efficiencies above 80% over the entire bandwidth. Integration of gallium nitride-based Gallium Nitride High Electron Mobility Transistors (GaN HMET) provides fast switching speeds below 100 nanoseconds, facilitating rapid reconfiguration of absorber functionalities. These advancements in metamaterial absorbers offer promising prospects for intelligent and integrated designs in future applications.

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Section: Metamaterials Absorber In Terahertzmentioning

confidence: 99%

Advancements in tunable and multifunctional metamaterial absorbers: a comprehensive review of microwave to terahertz frequency range

Liu,

Dong,

Sabri

et al. 2024

J. Phys. D: Appl. Phys.

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“…The THz sensors can be categorized into several types. The first type is the refractive index sensor, which infers the refractive index of the analyte attached to the sensor surface based on the change of the sensor’s resonant frequency. − The second type is the biosensor, capable of detecting DNA short sequences, thrombin, carcinoembryonic antigen (CEA) biomarkers, glucose, − microorganisms, and corneal tissues, ensuring food security, and identifying viruses , and cancer cells, , while some other biosensors have been achieved through on-chip design. , Furthermore, the pesticide sensor is also a hot topic, aiming to detect pesticide concentration through variations in resonant peaks (frequency or amplitude shifts). Some recent works have focused on detecting pesticides like 2,4-dichlorophenoxyacetic acid (2,4-D), chlorpyrifos-methyl, and phosalone. − In addition, other types of THz sensors include temperature metamaterial sensors for low-loss amplitude modulators and temperature-controlled THz devices, − as well as photonic sensors for ultrafast all-optical switching and precise label-free immunosensing. , …”

Section: Introductionmentioning

confidence: 99%

A Flexible Terahertz Metamaterial Sensor for Pesticide Sensing and Detection

Wang,

Luo,

2024

ACS Appl. Mater. Interfaces

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Terahertz (THz) waves have garnered significant interest across various fields, particularly in high-sensitivity sensing applications. Metamaterials can be employed in THz sensors, specifically for refractive index sensing and pesticide detection due to their highsensitivity characteristics. In this Article, a dual-band flexible THz metamaterial sensor based on polyimide is proposed for refractive index and pesticide sensing, which is fabricated using ultraviolet (UV) lithography technology and measured by a THz time-domain spectroscope (TDS) system. The resonant frequencies of the sensor are at 0.37 and 1.13 THz, with transmission rates of 2.9% and 0.3%, respectively. With an analyte layer attached to the sensor's surface, the sensitivity of refractive index sensing can be calculated as 0.09 and 0.28 THz/RIU (refractive index unit) at the two resonant frequencies. In order to validate the exceptional pesticide sensing performance of the sensor, chlorpyrifos-methyl acetone solutions with various concentrations are added on it. Furthermore, a monolayer of graphene is coated on the sensor's surface, which is proved capable of improving pesticide sensing sensitivity at low concentrations due to strong π−π stacking interactions with π-electrons in chlorpyrifos-methyl solutions. Therefore, the graphene-coated sensor can be utilized in detecting pesticide solutions with low concentrations, and the sensor without graphene is preferred for high concentration detection. This work provides a novel option for the THz metamaterial sensor with high sensitivity covering a wide pesticide concentration range.

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“…Plasmonic perfect absorbers (PPAs) with narrowband and broadband absorption have been present in metamaterials since they were first investigated in 2008. 1,2 A large number of PPAs have been proposed for frequencies ranging from visible, 3 near-infrared, 4,5 mid-infrared, 6 and terahertz 7 to microwave. 8 PPAs have attracted a large amount of research attention due to their potential applications in sensors, 9 solar cells, 10 thermal imaging devices, 11 and photodetectors.…”

Section: Introductionmentioning

confidence: 99%

A TM polarization absorber based on a graphene–silver asymmetrical grating structure for near-infrared frequencies

Wang,

Li,

Chen

et al. 2023

Phys. Chem. Chem. Phys.

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A high Q-factor dual-band terahertz metamaterial absorber and its sensing characteristics

Abstract: In this paper, a dual-band metamaterial absorber in the terahertz frequencies is proposed and its refractive index sensing characteristics is analyzed. The metamaterial structure is designed using a square metal...

Cited by 52 publications

References 61 publications

Advancements in tunable and multifunctional metamaterial absorbers: a comprehensive review of microwave to terahertz frequency range

Advancements in tunable and multifunctional metamaterial absorbers: a comprehensive review of microwave to terahertz frequency range

A Flexible Terahertz Metamaterial Sensor for Pesticide Sensing and Detection

A TM polarization absorber based on a graphene–silver asymmetrical grating structure for near-infrared frequencies

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