Ultra-Broadband Super Light Absorber Based on Multi-Sized Tapered Hyperbolic Metamaterial Waveguide Arrays

Yin, Xiangkun; Chen, Lin; Li, Xun

doi:10.1109/jlt.2015.2453995

Cited by 44 publications

(22 citation statements)

References 39 publications

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“…Understanding the EM characteristics of an HMM waveguide array above‐mentioned helps us design a transmissive wavefront manipulation device. It should be emphasized here, the phase control with the HMM waveguide array can be fulfilled over a wide range of frequencies throughout the visible, near‐infrared, mid‐infrared, terahertz, and microwave spectral regions by freely tuning the geometry defining the multilayer . Here as an example, we have chosen the microwave regime to investigate the modal dispersions for the three HMM waveguide arrays ( Figure a–c) as Cu and FR4 are taken as the metal and dielectric layers.…”

Section: Resultsmentioning

confidence: 99%

“…We believe, provided the coupling issue solved, the resultant conversion efficiency can be significantly enhanced, being comparable to that with dielectric metasurfaces . A promising approach to address the coupling issue is to add a tapered HMM waveguide array to overcome the momentum mismatch at the incidence plane, which has been exploited for ultra‐wideband absorption with HMM waveguide arrays . We are currently exploring some of these avenues.…”

Section: Resultsmentioning

confidence: 99%

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Hyperbolic Metamaterial Devices for Wavefront Manipulation

Yin

Zhu

Guo

et al. 2018

Laser & Photonics Reviews

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Metasurfaces have shown great potential to reshape the wavefront of electromagnetic (EM) waves, but transmissive meta-devices face challenges of low-efficiency and/or fabrication complexities. Here, an alternative approach to realize high-efficiency transmission-mode meta-devices to control EM wavefronts, based on hyperbolic metamaterial (HMM) waveguides supporting tailored spoof surface plasmons (SSPs) on their side walls, is proposed. By manipulating the dispersions of SSPs through adjusting the HMM geometrical parameters, the phases of EM waves passing through such waveguides, which enables the design of meta-devices with desired transmission-phase profiles for particular wave-manipulation applications, can be controlled. Microwave experiments are implemented to demonstrate two wave-control effects based on the mechanism, that is, beam-deflection and focusing, and a maximum conversion efficiency of 42.9% is achieved for the anomalous refracted beam. By scaling down the HMM meta-devices, the proposal herein is applicable to optical frequencies and in principle promises significantly raised conversion efficiencies. The scheme herein can offer a higher effective refractive index and more tunable dispersion without using high-index dielectric materials, and thus can serve as an effective and robust approach to make high-efficiency transmissive meta-devices with diversified functionalities.approach to the extreme control of EM waves, leading to a variety of intriguing phenomena and applications that are unattainable with natural materials such as negative refraction, [4] super-resolution imaging, [5] and invisibility cloaking. [6] As the 2D equivalent of metamaterials, metasurfaces have shown great promises to control EM waves by locally modulating the phase, amplitude and/or polarization of the scattered field. [7][8][9][10][11][12][13] Distinct from traditional photonic devices (e.g., lenses) that rely on propagation phases accumulated inside the device to shape the wavefront, metasurfaces utilize the interfacial phase discontinuities introduced by subwavelength-sized planar resonators to locally control the amplitude and phase of scattered waves and thus to reshape the wavefront of EM waves. Many fascinating wave-manipulation effects were discovered based on metasurfaces, such as light bending, [7,11,13] unidirectional surface plasmon coupling, [8,14] invisibility cloaks, [6,15] flat lenses, [9,16] holography, [17,18] and generation of vortex beam. [7,19] Transmissive metasurfaces are particularly useful in practice, but the working efficiencies of single-layer plasmonic metasurfaces are typically low. For example, a single-layer Pancharatnam-Berry (PB) metasurface, working for circularly polarized (CP) light, cannot exhibit an efficiency higher than 25%, due to

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Hyperbolic Metamaterial Devices for Wavefront Manipulation

Yin

Zhu

Guo

et al. 2018

Laser & Photonics Reviews

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“…In ref. 42, an ultra-wideband absorber has a bandwidth from 1-30 THz (187.1%) with absorptivity larger than 0.8. However, the structure in ref.…”

Section: Introductionmentioning

confidence: 99%

“…However, the structure in ref. 42 is very complicated as each unit cell includes three tapered hyperbolic metamaterial (HMM) waveguides and each tapered HMM is composed of alternating Al and GaAs layers. In ref.…”

Section: Introductionmentioning

confidence: 99%

Metal and graphene hybrid metasurface designed ultra-wideband terahertz absorbers with polarization and incident angle insensitivity

Peng

Liu

et al. 2019

Nanoscale Adv.

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“…For decades, perfect absorption has been central to various potential applications, such as sensors [1], micro-lens [2], energy harvesting [3][4][5][6], and radar stealth [7]. Compared to the traditional absorbers, such as quarter-wave antireflection coatings and surface relief structures that are limited by their large and bulk dimensions [8,9], metamaterial absorbers (MAs) have attracted considerable attention from microwave to optical frequency by virtue of the perfect absorption, thin thickness and flexible design [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Ultra-Broadband Absorption With Gradient Pyramidal Metamaterials

Liu¹,

Guo²,

Han³

2017

PIER C

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Abstract-We propose a novel absorber by integrating four different-sized pyramidal metamaterials into a unit cell, which leads to a super broadband absorption by properly selecting the geometrical parameters for each pyramid. It is found that in such a design strategy, the high-order modes may be excited and further enhanced by multi-layer overlapping between adjacent unit cells. The as-designed MA, which consists of 13 pairs of alternating metal-dielectric layers with a total thickness of 4.13 mm, shows an absorption of above 90% in the whole frequency range of 7-21.5 GHz. The full width at half maximum is 101.8%, and the ratio of operational bandwidth to thickness achieves 7. The proposed MA is 30% broader and 5.2% thinner than previously reported absorbers working in the same spectral region. Numerical result shows that the proposed absorber is independent of the polarization. The absorption decreases with fluctuations as the incident angle increases but remains quasi-constant up to relatively large angles. Such a design shows great promise for a broad range of applications at microwave frequencies, and the proposed scheme may be extended to the visible, infrared, terahertz spectral regions.

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Ultra-Broadband Super Light Absorber Based on Multi-Sized Tapered Hyperbolic Metamaterial Waveguide Arrays

Cited by 44 publications

References 39 publications

Hyperbolic Metamaterial Devices for Wavefront Manipulation

Hyperbolic Metamaterial Devices for Wavefront Manipulation

Metal and graphene hybrid metasurface designed ultra-wideband terahertz absorbers with polarization and incident angle insensitivity

Ultra-Broadband Absorption With Gradient Pyramidal Metamaterials

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