A wide-angle and TE/TM polarization-insensitive terahertz metamaterial near-perfect absorber based on a multi-layer plasmonic structure

Sun, Yuanbo; Shi, Yanpeng; Liu, Xiaoyu; Song, Jinmei; Li, Meiping; Wang, Xiaodong; Yang, Fuhua

doi:10.1039/d1na00246e

Cited by 19 publications

(16 citation statements)

References 53 publications

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Section: Non‐tunable Tmasmentioning

confidence: 99%

“…[46,47] Sun et al proposed a multilayer gradient structure based on Au/Si (Figure 6a). [46] The wide spectral absorption can be achieved when the two unit cells with different gradients are placed in a period (Figure 6b). The second is a multi-layer structure formed by vertical stacking of the metal layers with different geometries or sizes separated by the dielectric layers.…”

Section: Broadband Tmasmentioning

confidence: 99%

“…The absorption band and its bandwidth will be fixed once the above mentioned TMAs are designed and processed. With the continuous development of modern technology and continuous deepening of TMA research, however, the requirements for TMAs are no longer just small size and high absorption, [46] Copyright 2021, Royal Society of Chemistry. c,d) A multi-layer TMA, for which the resonators in different metal layers are different.…”

Section: Tunable Tmasmentioning

confidence: 99%

“…The first is a pyramid structure formed by the alternating superposition of the metal layers and dielectric layers with gradient changes in size. [46,47] Sun et al proposed a multilayer gradient structure based on Au/Si (Figure 6a). [46] The wide spectral absorption can be achieved when the two unit cells with different gradients are placed in a period (Figure 6b).…”

Section: Broadband Tmasmentioning

confidence: 99%

mentioning

confidence: 99%

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Terahertz Metamaterial Absorbers

Chen

Chai

Jin

et al. 2021

Adv Materials Technologies

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Terahertz metamaterial absorbers (TMAs) can efficiently absorb electromagnetic wave in the range of 0.1–10 THz based on the tunable electromagnetic properties of artificially designed unit cells. TMAs can achieve perfect absorption, as well as broad band absorption. Specifically, TMAs can break the thickness limit of a device at a quarter wavelength, realizing ultra‐thin devices so as to facilitate integration with other systems. Accordingly, TMAs have high application value in communication, imaging, detection, security inspection, and other fields because of their characteristics of small size, perfect absorption, less restriction of natural materials, and tunable electromagnetic parameters. This review covers the fundamental principles and recent advances of TMAs, from the essential structural features of TMAs and working principle of various types of TMAs to the design and applications of corresponding structures, especially the TMAs that can be tuned by various approaches. The development trend and challenges of TMAs are briefly discussed too. It is envisioned that this review can help R&D of the future TMAs for real applications.

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Section: Non‐tunable Tmasmentioning

confidence: 99%

Section: Broadband Tmasmentioning

confidence: 99%

Section: Tunable Tmasmentioning

confidence: 99%

Section: Broadband Tmasmentioning

confidence: 99%

mentioning

confidence: 99%

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Terahertz Metamaterial Absorbers

Chen

Chai

Jin

et al. 2021

Adv Materials Technologies

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

Wang

Duan

et al. 2023

Adv Funct Materials

149

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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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Flexible Terahertz Metasurface Absorbers Empowered by Bound States in the Continuum

Xu,

Xue,

Fan

et al. 2024

Advanced Materials

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Terahertz absorbers are crucial to the cutting‐edge techniques in the next‐generation wireless communications, imaging, sensing, and radar stealth, as they fundamentally determine the performance of detectors and cloaking capabilities. It has long been a pressing task to find absorbers with customizable performance that can adapt to various environments with low cost and great flexibility. Here, perfect absorption empowered by bound states in the continuum (BICs) is demonstrated, allowing for the tailoring of absorption coefficient, bandwidth, and field of view. The one‐port absorbers are interpreted using temporal coupled‐mode theory highlighting the dominant role of BICs in the far‐field radiation properties. Through a thorough investigation of BICs from the perspective of lattice symmetry, the radiation features of three BIC modes are unraveled using both multipolar and topological analysis. The versatile radiation capabilities of BICs provide ample freedom to meet specific requirements of absorbers, including tunable bandwidth, stable performance in a large field of view, and multiband absorption using a thin and flexible film without extreme geometric demands. These findings offer a systematic approach to developing optoelectronic devices and demonstrate the significant potential of BICs for optical and photonic applications, which will stimulate further studies on terahertz photonics and metasurfaces.

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A wide-angle and TE/TM polarization-insensitive terahertz metamaterial near-perfect absorber based on a multi-layer plasmonic structure

Abstract: A kind of near-perfect metamaterial absorber, made of only Au and Si, has been presented in the terahertz band with extremely high absorptance. A flexible design method is proposed, which...

Cited by 19 publications

References 53 publications

Terahertz Metamaterial Absorbers

Terahertz Metamaterial Absorbers

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

Flexible Terahertz Metasurface Absorbers Empowered by Bound States in the Continuum

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