THz-metamaterial absorbers

Pham, Van Tuong; Park, J W; Vu, Dinh Lam; Zheng, Haiyu; Rhee, Joo Yull; Kim, K W; Lee, Y P

doi:10.1088/2043-6262/4/1/015001

Cited by 34 publications

(25 citation statements)

References 15 publications

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“…Numerous particular realizations of thin absorbers of this type have been reported, e.g., Refs. [19,21,29,30,53,63,66,106]. The majority of the known realizations are for the microwave frequencies, and they use metals, most commonly, copper, as the material for the ground plane and the capacitive patch array.…”

Section: Thin Layer Of An Artificial Magnetic At a Pec Plane (High-immentioning

confidence: 99%

“…[29], where the name metamaterialbased perfect absorber is introduced, designs of thin composite absorbing layers (now commonly called metamaterial-based absorbers) developed earlier for microwave frequencies have been extended to higher frequencies, up to the visible range. There have been perfect absorbers reported in terahertz [12,30], near-infrared [31], and visible light [23] frequencies. A recent review of metamaterialbased electromagnetic wave absorbers can be found in Ref.…”

Section: Introductionmentioning

confidence: 99%

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Thin Perfect Absorbers for Electromagnetic Waves: Theory, Design, and Realizations

2015

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With recent advances in nanophotonics and nanofabrication, considerable progress has been achieved in realizations of thin composite layers designed for full absorption of incident electromagnetic radiation, from microwaves to the visible. If the layer is structured at a subwavelength scale, thin perfect absorbers are usually called "metamaterial absorbers," because these composite structures are designed to emulate some material responses not reachable with any natural material. On the other hand, many thin absorbing composite layers were designed and used already in the time of the introduction of radar technology, predominantly as a means to reduce radar visibility of targets. In view of a wide variety of classical and new topologies of optically thin metamaterial absorbers and plurality of applications, there is a need for a general, conceptual overview of the fundamental mechanisms of full absorption of light or microwave radiation in thin layers. Here, we present such an overview in the form of a general theory of thin perfectly absorbing layers. Possible topologies of perfect metamaterial absorbers are classified based on their fundamental operational principles. For each of the identified classes, we provide design equations and give examples of particular realizations. The concluding section provides a summary and gives an outlook on future developments in this field.

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Section: Thin Layer Of An Artificial Magnetic At a Pec Plane (High-immentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thin Perfect Absorbers for Electromagnetic Waves: Theory, Design, and Realizations

2015

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“…Following this design strategy, polarization insensitive or polarization dependent broadband absorbers have been widely demonstrated from microwave to optical [8]- [23]. For example, Huang et al [11] presented the polarization dependent broadband absorber based on three I-shaped resonators.…”

Section: Introductionmentioning

confidence: 99%

Polarization Tunable Terahertz Metamaterial Absorber

Wang

Zhai

et al. 2015

IEEE Photonics J.

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Metamaterial-based perfect absorbers have attracted considerable attention due to their great prospect for practical applications. The existing absorbers, however, are mostly polarization insensitive or only sensitive to one direction, which is inapplicable in some areas. Polarization tunable or high absorption in two orthogonal directions is very useful and necessary. Herein, we present a polarization tunable absorber formed by an asymmetric patch and a dielectric layer on top of a metallic board. With this structure, the frequency of the absorber can be tuned by merely changing the polarization of the incident. The tunable mechanism originates from the different length of the patch along the two orthogonal directions. The concept is rather general and applicable to various absorbers as long as the asymmetric design is valid. The absorber can find practical applications in manipulation of the polarization of the light and detecting waves with specific polarization.

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“…Several multilayer structures with three or more number of layers have been theoretically proposed to enhance the bandwidth of absorption using metamaterial; but they are polarization-dependant structures which limits them for practical applications [26,27]. Bandwidth-enhanced absorbers in terahertz frequency domain have been proposed using structures with larger thicknesses [28,29]. Structures using magnetic composite layer and lumped elements have also been proposed as bandwidth-enhanced metamaterial absorber [30,31].…”

Section: Introductionmentioning

confidence: 99%

Bandwidth-enhanced dual-band dual-layer polarization-independent ultra-thin metamaterial absorber

et al. 2014

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In this paper, a polarization-independent metamaterial absorber with enhanced bandwidth at two separate frequency bands is proposed over wide angle of incidence. The proposed structure consists of two layers of dielectric substrate. The unit cell is designed on the top surfaces of both the layers of the dielectric by parametric optimization in such a way that bandwidth-enhanced absorptions occur in C and X bands. The proposed structure is fabricated, and experimental results are in good agreement with the simulated responses. This bandwidthenhanced dual-band absorption nature is maintained for any angle of polarization under normal incidence, thus making the absorber polarization independent in nature. The structure also shows bandwidth-enhanced dual-band absorptions over wide angle of incidence up to 45°under TE polarization and 30°under TM polarization. Moreover, the proposed structure is ultra-thin, having total thickness of 3.2 mm, *k/14 and k/10 with respect to the center frequencies of two absorption bands.

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THz-metamaterial absorbers

Cited by 34 publications

References 15 publications

Thin Perfect Absorbers for Electromagnetic Waves: Theory, Design, and Realizations

Thin Perfect Absorbers for Electromagnetic Waves: Theory, Design, and Realizations

Polarization Tunable Terahertz Metamaterial Absorber

Bandwidth-enhanced dual-band dual-layer polarization-independent ultra-thin metamaterial absorber

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