Theoretical Investigation of Broadband and Wide-Angle Terahertz Metamaterial Absorber

Wang, Ben‐Xin; Wang, Lingling; Wang, Guizhen; Huang, Wei‐Qing; Li, Xiaofei; Zhai, Xiang

doi:10.1109/lpt.2013.2289299

Cited by 187 publications

(58 citation statements)

References 22 publications

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“…It is critical to note here that unlike metamaterial absorbers, the proposed metamaterial harvester not only absorb the energy within the medium, but also utilize a load resistor to channel the absorbed energy to a load. In previous metamaterial absorber designs [22][23][24]28], the absorbed energy is dissipated mostly within the lossy substrate used to host the metasurface resonators. In the proposed metasurface harvester, a low loss substrate was used, and the energy was trapped across a resistive load placed at the gap of the resonator instead of the substrate host material.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Dual-Polarized Multi-Band Infrared Energy Harvesting Using H-Shaped Metasurface Absorber

Almoneef¹,

Ramahi²

2017

PIER C

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Abstract-We present the design of an infrared metasurface harvester based on the full absorption concept. The metasurface unit cells consist of an H-shaped resonator with the load placed across the gap of the resonator. Different from infrared metamaterial absorber designs, the resonator is capable of not only full absorption but also maximum energy channeling across the load resistance. Numerical simulation demonstrates that 96% of the absorbed energy is dissipated across the load resistance. In addition, cross-polarized H-resonators design is presented, which is capable of harvesting infrared energy using dual polarizations within three frequency bands.

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Section: Resultsmentioning

confidence: 99%

“…Infrared metasurface perfect absorbers consist of an array of sub-wavelength unit cells that is capable of absorbing all the energy from an incoming wave [22][23][24][25][26][27]. This is achievable by simultaneously minimizing the reflectivity and transmissivity from and through the medium.…”

Section: Introductionmentioning

confidence: 99%

Dual-Polarized Multi-Band Infrared Energy Harvesting Using H-Shaped Metasurface Absorber

Almoneef¹,

Ramahi²

2017

PIER C

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“…[14][15][16][17][18][19] The main limitation of multi-layer structures is the devices involved very complex designs and fabrication processes, so it is difficult to integrate with commercial technologies and leads to the high cost. Most multilayer broadband absorbers are mainly focused on theoretical calculations and analysis, [14][15][16][17] while only a few reports have experimental results. 18,19 Single-layer structure is more attractive than the multi-layer broadband absorbers in terms of fabrication simplicity and low cost.…”

Section: Introductionmentioning

confidence: 99%

Broadband terahertz metamaterial absorber based on simple multi-ring structures

et al. 2018

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Single-layer metallic rings are the effective structure cell which are widely used to design single-band and multiband perfect metamaterial absorbers owning to their electromagnetic resonance. However, the absorbers based on the single-layer metallic rings have a common shortcoming, that is the narrow absorption bandwidth. To overcome the limitations, here we proposed a single-layer, flexible and broadband terahertz metamaterial absorber, which consists of four sub-cells with multiple metal rings and a metal ground plane separated by a dielectric layer. By enhancing the coupling response between adjacent metallic rings and merging the adjacent resonant peaks of multi-resonators, we experimentally observed broadband characteristics at the terahertz band. The average absorption of 88% from 0.63 to 1.34 THz and the relative absorption bandwidth of 95% at the incident angle of 15o for TE polarization. Correspondingly, for TM polarization the absorption of more than 80% from 0.61 to 1.1 THz with the relative absorption bandwidth of 80% were also observed. The results went far beyond the previous single-layer absorbers based on metal rings and were much better than the fractal-cross structure reported recently [Kenney et al., ACS Photonics 4, 2604 (2017)]. We had reason to believe that the presented terahertz metamaterial absorber with broad absorption bandwidth and simple structure can find important applications in communication, stealth, energy harvesting systems and so on.

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“…Different geometries have been demonstrated including split-ring resonators, 13,14 Swiss crosses, [15][16][17] concentric rings, 18 square patches, [19][20][21][22][23] and circular disks. 24 At resonance, these structures can absorb radiation with high efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…25 Typically, structures with different sizes are combined together to increase the number of absorption bands for broadband absorbers. As an alternative method, square patches with comparable sizes are located in a planar array 19 or are stacked on top of each other with dielectric spacers in between 20,23 to increase the number of absorption bands. In addition, concentric rings are used as resonators to extend the absorption band as well.…”

Section: Introductionmentioning

confidence: 99%

A micromachined freestanding terahertz absorber with an array of metallic patches

2016

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An array of square metallic patches on a thin suspended dielectric layer is introduced as an effective terahertz absorber. The suspended structure is placed on a metalized substrate and the device exhibits metamaterial behavior at specific frequencies determined by the size of the patches. It is feasible to place patches with different sizes in an array formation for a broadband absorber. In array configuration, individual elements induce distinct resonances yielding narrow band absorption regions. Design of the absorber is described using electromagnetic simulations. The absorber structure was fabricated on a silicon wafer using standard microfabrication techniques. The characteristics of the absorber were measured using a terahertz time domain spectroscope. The measured data match well the simulations indicating strong absorption peaks in a band of 0.5-2 THz.

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Theoretical Investigation of Broadband and Wide-Angle Terahertz Metamaterial Absorber

Cited by 187 publications

References 22 publications

Dual-Polarized Multi-Band Infrared Energy Harvesting Using H-Shaped Metasurface Absorber

Dual-Polarized Multi-Band Infrared Energy Harvesting Using H-Shaped Metasurface Absorber

Broadband terahertz metamaterial absorber based on simple multi-ring structures

A micromachined freestanding terahertz absorber with an array of metallic patches

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