Multiband terahertz absorber and selective sensing performance

Wang, Yue; Cui, Zijian; Zhu, Dongying; Wang, Xinmei; Chen, Suguo; Nie, Ping

doi:10.1364/oe.27.014133

Cited by 22 publications

(8 citation statements)

References 38 publications

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“…59,60 In contrast, conventional metamaterial sensors capable of high-concentration detection have rarely employed graphene to enhance sensitivity for low-concentration detection. 35,61 In this work, a THz dual-band metamaterial sensor is proposed, using a metal periodically patterned structure coated on the top of a polyimide film. This design achieves strong resonances at 0.37 and 1.13 THz with remarkable polarization insensitivity.…”

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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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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“…Compared with single-band absorption, multi-band MAs can achieve simultaneously near-perfect absorption at multiple discrete frequency points, which can enrich the practical applications of the MAs. [53][54][55] However, considering the intrinsic property of multi-band MAs, that is, discrete absorption rather than continuous absorption, they are exceptionally restricted in some civilian and military aspects, such as radar cloaking, [56][57][58] solar photovoltaic conversion, [59] photodetectors, [60,61] and thermal radiation measurements. [62][63][64] It is of great significance, therefore, to make a profound study of the construction of MAs having broadband absorption.…”

Section: Introductionmentioning

confidence: 99%

Review of Broadband Metamaterial Absorbers: From Principles, Design Strategies, and Tunable Properties to Functional Applications

Wang

Duan

et al. 2023

Adv Funct Materials

111

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Metamaterial absorbers have been widely studied and continuously concerned owing to their excellent resonance features of ultra-thin thickness, light-weight, and high absorbance. Their applications, however, are typically restricted by the intrinsic dispersion of materials and strong resonant features of patterned arrays (mainly referring to narrow absorption bandwidth). It is, therefore essential to reassert the principles of building broadband metamaterial absorbers (BMAs). Herein, the research progress of BMAs from principles, design strategies, tunable properties to functional applications are comprehensively and deeply summarized. Physical principles behind broadband absorption are briefly discussed, typical design strategies in realizing broadband absorption are further emphasized, such as top-down lithography, bottom-up self-assembly, and emerging 3D printing technology. Diversified active components choices, including optical response, temperature response, electrical response, magnetic response, mechanical response, and multi-parameter responses, are reviewed in achieving dynamically tuned broadband absorption. Following this, the achievements of various interdisciplinary applications for BMAs in energy-harvesting, photodetectors, radar-IR dual stealth, bolometers, noise absorbing, imaging, and fabric wearable are summarized. Finally, the challenges and perspectives for future development of BMAs are discussed.

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“…In some recently works, the sensing properties of sensors are studied by means of several solutions with different concentrations, such as glucose, 42 chlorpyrifos (CPS), and 2,4-dichlorophenoxyacetic acid (2,4-D). 43,44 Moreover, terahertz sensors using diverse novel materials have also been investigated in depth, including lead iodide (PbI 2 ) for ultrafast all-optical switching, 45 polymethyl methacrylate (PMMA) for molecular vibrational sensing, 46 perovskites for flexible devices, 47 and valley photonic crystals for ultrasensitive topological sensing. 48 In addition to the familiar sensors that judged by the amplitude shift, some sensors rely on phase change characteristics, which also have potential applications in biosensing.…”

Section: Introductionmentioning

confidence: 99%