Perfect subwavelength fishnetlike metamaterial-based film terahertz absorbers

Shchegolkov, Dmitry; Azad, Abul K.; O’Hara, John F.; Simakov, Evgenya I.

doi:10.1103/physrevb.82.205117

Cited by 197 publications

(68 citation statements)

References 15 publications

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“…[ 83 ] Rather than the standard 3-layer design, this group utilized a chiral version of an SRR that consisted of two stacked rings connected by vias to create an inductive effect, while strips of these chiral metamaterials are then interlocked in a 3D grid to create a capacitive effect; the chiral metamaterial array is then backed by a copper ground plane and covered with a dielectric plate. [ 83 ] Since these fi rst few absorbers many groups have also shown absorption for all wave polarizations using very similar structures in various bands of the electromagnetic spectrum, such as at THz [84][85][86][87][88][89] and IR. [ 72 , 71 , 90-94 ] Many plasmonic absorbers yield polarization independent response, as the structures utilized are either rotationally symmetric, or have π /2 rotational symmetry.…”

Section: Broad Bandwidthmentioning

confidence: 99%

Metamaterial Electromagnetic Wave Absorbers

2012

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The advent of negative index materials has spawned extensive research into metamaterials over the past decade. Metamaterials are attractive not only for their exotic electromagnetic properties, but also their promise for applications. A particular branch–the metamaterial perfect absorber (MPA)–has garnered interest due to the fact that it can achieve unity absorptivity of electromagnetic waves. Since its first experimental demonstration in 2008, the MPA has progressed significantly with designs shown across the electromagnetic spectrum, from microwave to optical. In this Progress Report we give an overview of the field and discuss a selection of examples and related applications. The ability of the MPA to exhibit extreme performance flexibility will be discussed and the theory underlying their operation and limitations will be established. Insight is given into what we can expect from this rapidly expanding field and future challenges will be addressed.

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Section: Broad Bandwidthmentioning

confidence: 99%

Metamaterial Electromagnetic Wave Absorbers

2012

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“…[5] Selective absorption has been investigated in metamaterials made of different micro/nanostructures from GHz to IR spectral regime, including split-ring-resonators, [6,7] fishnet, [8] cut-wires [9,10] and photonic crystals. [11] Recently, film-coupled metamaterials in metal-insulator-metal configurations have been intensively studied as thermal emitters or selective absorbers from visible to NIR spectral regime.…”

Section: Introductionmentioning

confidence: 99%

Highly efficient selective metamaterial absorber for high-temperature solar thermal energy harvesting

Wang

Sivan²,

Mitchell³

et al. 2015

Solar Energy Materials and Solar Cells

262

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ABSTRACT:In this work, a metamaterial selective solar absorber made of nanostructured titanium gratings deposited on an ultrathin MgF 2 spacer and a tungsten ground film is proposed and experimentally demonstrated. Normal absorptance of the fabricated solar absorber is characterized to be higher than 90% in the UV, visible and, near infrared (IR) regime, while the mid-IR emittance is around 20%. The high broadband absorption in the solar spectrum is realized by the excitation of surface plasmon and magnetic polariton resonances, while the low mid-IR emittance is due to the highly reflective nature of the metallic components. Further directional and polarized reflectance measurements show wide-angle and polarization-insensitive high absorption within solar spectrum. Temperature-dependent spectroscopic characterization indicates that the optical properties barely change at elevated temperatures up to 350°C. The solar-to-heat conversion efficiency with the fabricated metamaterial solar absorber is predicted to be 78% at 100°C without optical concentration or 80% at 400°C with 25 suns, and could be further improved with better fabrication processes and geometric optimization during metamaterial design. The strong spectral selectivity, favorable diffuse-like behavior, and excellent thermal stability make the metamaterial selective absorber promising for significantly enhancing solar thermal energy harvesting in various system at mid to high temperatures.

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“…The first demonstration of magnetic response at terahertz frequencies was by Yen et al [30] in 2004 using ellipsometric techniques. Inspired by the promise of negative index materials, metamaterial research has resulted in the development of MM-based THz devices such as THz modulators, filters, perfect absorbers, compact antennas, polarization rotators and many more [31][32][33][34][35][36]. The resonant response is fixed by the SRR geometry and the substrate.…”

Section: Terahertz Metamaterialsmentioning

confidence: 99%