A reconfigurable hyperbolic metamaterial perfect absorber

Behera, Jitendra K.; Liu, Kuan; Lian, Meng; Cao, Tun

doi:10.1039/d0na00787k

Cited by 25 publications

(23 citation statements)

References 89 publications

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“…Instead of VO 2 , some other PCMs capable of reconfiguring their electrical properties at different crystalline states have also been demonstrated to effectively modulate the absorption performance of MAs. [28,30,131] For instance, Jeong et al reported a reconfigurable MA based on the PCM of germanium telluride (GeTe). [30] By applying temperature from 25 to 250 °C, the GeTe films located between the gap of a circular patch transited from an amorphous state with high resistance to a crystalline lowresistive state, resulting in the reconfigurability of the resonant frequency from 10.23 to 9.6 GHz, as displayed in Figure 5i.…”

Section: Phase-change Materialsmentioning

confidence: 99%

Section: Periodic Patterns For Tunable/reconfigurable Masmentioning

confidence: 99%

“…Similarly, Behera et al experimentally realized a frequency reconfigurable MA composed of Au and Ge 2 Sb 2 Te 5 (GST225) multilayers. [28] Different from thermally driven GeTe, a pulsed laser was employed to the GST225 films to change its state from amorphous to crystalline. The fabricated MA operating in the near-IR region could reconfigure the resonant wavelength from 1.18 to 1.68 µm, demonstrating a W RTR of 34.9%.…”

Section: Phase-change Materialsmentioning

confidence: 99%

“…For example, as MAs are passive devices, the operating frequency and the working bandwidth are fixed once they are fabricated. [27][28][29] This is doomed to conflict with the miniaturization of electrical devices due to the multiple MAs used in the devices. The concept of tunable/reconfigurable MAs has been proposed to solve this dilemma.…”

Section: Introductionmentioning

confidence: 99%

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Metamaterial Absorbers: From Tunable Surface to Structural Transformation

et al. 2022

Advanced Materials

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Since the first demonstration, remarkable progress has been made in the theoretical analysis, structural design, numerical simulation, and potential applications of metamaterial absorbers (MAs). With the continuous advancement of novel materials and creative designs, the absorption of MAs is significantly improved over a wide frequency spectrum from microwaves to the optical regime. Further, the integration of active elements into the MA design allows the dynamical manipulation of electromagnetic waves, opening a new platform to push breakthroughs in metadevices. In the last several years, numerous efforts have been devoted to exploring innovative approaches for incorporating tunability to MAs, which is highly desirable because of the progressively increasing demand on designing versatile metadevices. Here, a comprehensive and systematical overview of active MAs with adaptive and on‐demand manner is presented, highlighting innovative materials and unique strategies to precisely control the electromagnetic response. In addition to the mainstream method by manipulating periodic patterns, two additional approaches, including tailoring dielectric spacer and transforming overall structure are called back. Following this, key parameters, such as operating frequency, relative tuning range, and switching speed are summarized and compared to guide for optimum design. Finally, potential opportunities in the development of active MAs are discussed.

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Section: Phase-change Materialsmentioning

confidence: 99%

Section: Periodic Patterns For Tunable/reconfigurable Masmentioning

confidence: 99%

Section: Phase-change Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Metamaterial Absorbers: From Tunable Surface to Structural Transformation

et al. 2022

Advanced Materials

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“…[11] Multilayers are the most common realization of HMMs. [12] Of special interest is the interaction of temperature with multilayer HMMs, either in wavelength-switchable temperature-actuated hyperlenses [13] and super absorbers [14] or in applications with high operating temperatures such as thermophotovoltaics, [15,16] hyperthermia therapy, [17,18] or radiative cooling. [19][20][21] However, one of the key challenges for all of these proposed applications is thermal stability.…”

mentioning

confidence: 99%

Strain‐Driven Thermal and Optical Instability in Silver/Amorphous‐Silicon Hyperbolic Metamaterials

Ocana‐Pujol

Forster

Spolenak

et al. 2022

Advanced Optical Materials

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Hyperbolic metamaterials show exceptional optical properties, such as near‐perfect broadband absorption, due to their geometrically‐engineered optical anisotropy. Many of their proposed applications, such as thermophotovoltaics or radiative cooling, require high‐temperature stability. In this work, Ag/a‐Si multilayers are examined as a model system for the thermal stability of hyperbolic metamaterials. Using a combination of nanotomography, finite element simulations, and optical spectroscopy, the thermal and optical instability of the metamaterials is mapped. Although the thermal instability initiates at 300 °C, the hyperbolic dispersion persists up to 500 °C. Direct finite element simulations on tomographical data provide a route to decouple and evaluate interfacial and elastic strain energy contributions to the instability. Depending on stacking order the instability's driving force is either dominated by changes in anisotropic elastic strain energy due thermal expansion mismatch or by minimization of interfacial energy. These findings open new avenues to understand multilayer instability and pave the way to design hyperbolic metamaterials able to withstand high temperatures.

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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

120

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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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A reconfigurable hyperbolic metamaterial perfect absorber

Abstract: Metamaterial (MM) perfect absorbers are realised over the various spectra from visible to microwave. Recently, different approaches have been explored to integrate tunability into the MM absorbers. Particularly, tuning has...

Cited by 25 publications

References 89 publications

Metamaterial Absorbers: From Tunable Surface to Structural Transformation

Metamaterial Absorbers: From Tunable Surface to Structural Transformation

Strain‐Driven Thermal and Optical Instability in Silver/Amorphous‐Silicon Hyperbolic Metamaterials

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

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