Broadband Terahertz Metamaterial Absorber Based on Asymmetric Resonators With Perfect Absorption

Wen, Yongzheng; Ma, Wei; Bailey, Joe; Matmon, Guy; Yu, Xiaomei

doi:10.1109/tthz.2015.2401392

Cited by 75 publications

(23 citation statements)

References 30 publications

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“…The signal greater than 95% can be absorbed by the device with SiO 2 thickness of t = 4 µm and metal diameter of d = 90 µm. This result can be interpreted from a normalized impedance extracted from the simulation [15,26]. For a sample with d = 90 µm and SiO 2 thickness of t = 4 µm, the imaginary and real parts of its normalized impedance are 0.04 and 0.95 respectively at a resonance frequency of 0.932 THz, as presented in Figs.…”

Section: Resultsmentioning

confidence: 80%

“…For example, Tao et al [17] experimentally showed a bi-layer THz MA composed of electrical ring resonator on cut wire in a reflection mode for the first time. Others have developed broadband THz MAs using methods such as a stack of many metamaterial layers, different material sizes in a unit cell, and a special pattern design in a unit cell [25][26][27][28]. In order to achieve frequency-adjustable absorption in a single device, the THz MAs with resonance frequency tunability are widely studied with different techniques such as those in the photoexcitation, liquid crystal, and thermal-based MAs [29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

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Polarization-Independent Wide-Angle Terahertz Metamaterial Absorber: Design, Fabrication and Characterization

Tantiwanichapan¹,

Ruangphanit²,

Yamwong³

et al. 2019

PIER M

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A metamaterial absorber in the Terahertz (THz) range is simulated and experimentally investigated in this work. The desired absorption frequency, efficiency, and bandwidth can be tuned by changing the metal and dielectric geometric parameters. An absorption greater than 85% for TM polarized light with an incident angle up to 70 • at any azimuthal direction is observed in a circular disc THz metamaterial structure. By adjusting the dielectric silicon dioxide (SiO 2) thickness to 4 µm, an optimal absorption greater than 95% can be achieved at a resonance frequency of 0.97 THz. The experimental results also indicate that using Titanium (Ti) as a metamaterial metal layer provides four times broader absorption bandwidth than Aluminium (Al). This study, which works on polarization-insensitive and wide-angle metamaterial absorbers, can be fundamentally applied to many THz applications including THz spectroscopy, imaging, and detection.

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Section: Resultsmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Polarization-Independent Wide-Angle Terahertz Metamaterial Absorber: Design, Fabrication and Characterization

Tantiwanichapan¹,

Ruangphanit²,

Yamwong³

et al. 2019

PIER M

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show abstract

“…plasmonic sensor [1,2], broadband terahertz resonator [3], heat generation [4] and selective thermal emitters [5]. The impact of engineered metamaterial structures on negative index metamaterial absorbers (MAs) allows us to govern absorption peaks in specific spans of the electromagnetic (EM) spectrum [6].…”

Section: Introductionmentioning

confidence: 99%

Metamaterial Absorber Comprised of Butt-Facing U-Shaped Nanoengineered Gold Metasurface

Ghasemi

Choudhury

2016

Energies

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Abstract:The paper reports spectral features of the absorbed electromagnetic (EM) waves in a new kind of multilayered plasmonic metamaterial thin film comprised of homogenous layers of copper and silicon as the bottom and the middle sections (of the thin film), respectively, and the inhomogeneous U-shaped nanoengineered gold layer as the top. Each unit cell of the top metasurface consists of one upside and one downside U-shaped (butt-facing) structure. The absorbance of EM waves is simulated in the wavelength range of 200´1500 nm under different incidence angles considering the wave as being transmitted from the metasurface side. The low-order TE and TM modes are taken into account for the estimation of wave absorbance under varying metasurfaces as well as silicon layer thicknesses. It has been found that the nanoengineered gold layer causes higher confinement of power in silicon, which can be further controlled by suitably adjusting its thickness. Further, the increased thickness of metasurface results in shifts in absorption peak along with the existence of dual-absorption maxima in the visible spectral range. The obtained spectral features reveal possible application of the proposed structure as a prudent metamaterial absorber, which can be exploited for EM heating purposes.

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“…In this concern, one should mention perfect transmission in the deflection mode, 10,11 perfect one-way absorbers with high transmission in the neighboring bands, 12 and ultrathin, (nearly) perfect absorbers for various frequency ranges. [13][14][15][16][17][18][19][20][21][22] In spite of the fact that many absorbers were designed for terahertz frequencies, the potential of polar dielectrics in such devices has not yet been fully exploited. Clearly, absorption regimes achievable in more or less complex structures depend on the properties of the lossy materials that are comprised by these structures.…”

Section: Introductionmentioning

confidence: 99%

Effect of in-material losses on terahertz absorption, transmission, and reflection in photonic crystals made of polar dielectrics

Serebryannikov

Nojima

Alıcı

et al. 2015

Journal of Applied Physics

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The effect of the material absorption factor on terahertz absorption (A), transmittance (T), and reflectance (R) for slabs of PhC that comprise rods made of GaAs, a polar dielectric, is studied. The main goal was to illustrate how critical a choice of the absorption factor for simulations is and to indicate the importance of the possible modification of the absorption ability by using either active or lossy impurities. The spectra of A, T, and R are strongly sensitive to the location of the polaritonic gap with respect to the photonic pass and stop bands connected with periodicity that enables the efficient combination of the effects of material and structural parameters. It will be shown that the spectra can strongly depend on the utilized value of the material absorption factor. In particular, both narrow and wide absorption bands may appear owing to a variation of the material parameters with a frequency in the vicinity of the polaritonic gap. The latter are often achieved at wideband suppression of transmission, so that an ultra-wide stop band can appear as a result of adjustment of the stop bands having different origin. The results obtained at simultaneous variation of the absorption factor and frequency, and angle of incidence and frequency, indicate the possibility of the existence of wide ranges of tolerance, in which the basic features do remain. This allows for mitigating the accuracy requirements for the absorption factor in simulations and promises the efficient absorption of nonmonochromatic waves and beams with a wide angular spectrum. Suppression of narrowband effects in transmission is demonstrated at rather large values of the absorption factor, when they appear due to either the defect modes related to structural defects or dispersion inspired variations of the material parameters in the vicinity of the polaritonic gap. Comparison with auxiliary structures helps one to detect the common features and differences of homogeneous slabs and slabs of a PhC, which are made of GaAs. © 2015 AIP Publishing LLC

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Broadband Terahertz Metamaterial Absorber Based on Asymmetric Resonators With Perfect Absorption

Cited by 75 publications

References 30 publications

Polarization-Independent Wide-Angle Terahertz Metamaterial Absorber: Design, Fabrication and Characterization

Polarization-Independent Wide-Angle Terahertz Metamaterial Absorber: Design, Fabrication and Characterization

Metamaterial Absorber Comprised of Butt-Facing U-Shaped Nanoengineered Gold Metasurface

Effect of in-material losses on terahertz absorption, transmission, and reflection in photonic crystals made of polar dielectrics

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