LIGHT ABSORBER WITH AN ULTRA-BROAD FLAT BAND BASED ON MULTI-SIZED SLOW-WAVE HYPERBOLIC METAMATERIAL THIN-FILMS (Invited Paper)

He, Sailing; Ding, Fei; Mo, Liuye; Bao, Fanglin

doi:10.2528/pier14040306

Cited by 56 publications

(32 citation statements)

References 27 publications

(30 reference statements)

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“…Thus the bandwidth broadening is still limited and the experimentally measured absorption efficiency is not very high. In addition to this, there have been other methods addressing this issue, such as adiabatic nanofocusing of gap surface plasmon modes excited by the scattering off subwavelength-sized wedges2324 and the excitation of slow-wave modes in tapered alternating metal-dielectric multiple thin films25262728.…”

mentioning

confidence: 99%

Broadband near-infrared metamaterial absorbers utilizing highly lossy metals

Ding

Dai

Chen

et al. 2016

Sci Rep

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260

147

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Radiation absorbers have increasingly been attracting attention as crucial components for controllable thermal emission, energy harvesting, modulators, etc. However, it is still challenging to realize thin absorbers which can operate over a wide spectrum range. Here, we propose and experimentally demonstrate thin, broadband, polarization-insensitive and omnidirectional absorbers working in the near-infrared range. We choose titanium (Ti) instead of the commonly used gold (Au) to construct nano-disk arrays on the top of a silicon dioxide (SiO2) coated Au substrate, with the quality (Q) factor of the localized surface plasmon (LSP) resonance being decreased due to the intrinsic high loss of Ti. The combination of this low-Q LSP resonance and the propagating surface plasmon (PSP) excitation resonance, which occur at different wavelengths, is the fundamental origin of the broadband absorption. The measured (at normal light incidence) absorption is over 90% in the wavelength range from 900 nm to 1825 nm, with high absorption persisting up to the incident angle of ~40°. The demonstrated thin-film absorber configuration is relatively easy to fabricate and can be realized with other properly selected materials.

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mentioning

confidence: 99%

Broadband near-infrared metamaterial absorbers utilizing highly lossy metals

Ding

Dai

Chen

et al. 2016

Sci Rep

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260

147

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“…A much higher photonic density of states will result in bigger absorption efficiency. There have been several papers on light absorption utilizing the HMM waveguide array [28]- [31]. Slow-light mode occurs in the HMM waveguide, and hence significantly enhance the photonic density of states, which results in strong light absorption [35].…”

Section: A Single-sized Tapered Hmm Absorbermentioning

confidence: 99%

“…Recently, "trapped rainbow" storage of light in metamaterials and plasmonic grating structures has been widely proposed to slow down light waves of different frequencies at different positions, representing a promising approach to producing localized EM enhancement over a wide spectral range [26], [27]. By utilizing the concept of trapped rainbow effect, tapered hyperbolic metamaterials (HMMs) that consist of a metal-dielectric multilayer structure have been further proposed and demonstrated to be capable of achieving broadband high absorption of incident EM waves for a wide range of incident angles [28]- [31]. Since the condition of hyperbolic dispersion relationship for HMMs can in principle be fulfilled from visible to microwave spectral regions by freely tuning the filling ratio of metal and dielectric layers, such a scheme is believed to be capable of simultaneous operation over a wide range of frequencies throughout the visible, near-infrared, mid-infrared, terahertz, and microwave spectral regions.…”

Section: Introductionmentioning

confidence: 99%

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

Yin

Chen

2015

J. Lightwave Technol.

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We propose an ultra-broadband super light absorber by integrating different-sized tapered hyperbolic metamaterial (HMM) waveguides, each of which has a different and wide absorption band due to broadband slow-light response, into a unit cell. We numerically demonstrate that such an absorber is superior to a single-sized HMM absorber in terms of absorption bandwidth, while maintaining a comparable absorption efficiency. A three different-sized HMM absorber presents the capability of working with an ultra-wide frequency band ranging from 1 to 30 THz, which is much larger than previously proposed absorbers working in the same spectral region. Such a design shows great promise for a broad range of applications such as thermal emitters, photovoltaics, optical-chemical energy harvesting, and stealth technology, where ultra-wideband absorption is in very high demand.

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“…Since the resonance wavelength of a single resonator highly depends on its geometrical design, methods have been developed by combining dual or multiple resonators with different sizes in one unit cell in order to obtain the multi-band or broadband absorption, including multi-width strips [27], multiple patches [28], cross resonators [26], disks [31] and mixture of cross and disk resonators [32], as well as stacked double ring resonators [33]. The metal-dielectric multilayers are also used to realize ultra-broadband absorption with either 1D gratings [34] or 2D trapezoid cavities [35] based on the stop-light waveguide theory and structured metamaterial absorber through multiple overlapping resonances [36,37].…”

Section: Introductionmentioning

confidence: 99%

Wavelength-selective mid-infrared metamaterial absorbers with multiple tungsten cross resonators

Li¹,

Stan²,

Czaplewski³

et al. 2018

Opt. Express

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Wavelength-selective metamaterial absorbers in the mid-infrared range are demonstrated by using multiple tungsten cross resonators. By adjusting the geometrical parameters of cross resonators in single-sized unit cells, near-perfect absorption with single absorption peak tunable from 3.5 µm to 5.5 µm is realized. The combination of two, three, or four cross resonators of different sizes in one unit cell enables broadband near-perfect absorption at mid-infrared range. The obtained absorption spectra exhibit omnidirectionality and weak dependence on incident polarization. The underlying mechanism of near-perfect absorption with cross resonators is further explained by the optical mode analysis, dispersion relation and equivalent RLC circuit model. Moreover, thermal analysis is performed to study the heat generation and temperature increase in the cross resonator absorbers, while the energy conversion efficiency is calculated for the thermophotovoltaic system made of the cross resonator thermal emitters and low-bandgap semiconductors.

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LIGHT ABSORBER WITH AN ULTRA-BROAD FLAT BAND BASED ON MULTI-SIZED SLOW-WAVE HYPERBOLIC METAMATERIAL THIN-FILMS (Invited Paper)

Cited by 56 publications

References 27 publications

Broadband near-infrared metamaterial absorbers utilizing highly lossy metals

Broadband near-infrared metamaterial absorbers utilizing highly lossy metals

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

Wavelength-selective mid-infrared metamaterial absorbers with multiple tungsten cross resonators

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