High-performance terahertz wave absorbers made of silicon-based metamaterials

Yin, Sheng; Zhu, Jin; Xu, Wendao; Jiang, Wei; Yuan, Jun; Yin, Geping; Xie, Lijuan; Ying, Yibin; Ma, Yungui

doi:10.1063/1.4929151

Cited by 115 publications

(49 citation statements)

References 28 publications

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“…4(b), which is qualitatively consistent with the waveguide cavity explanation. 25 For h = 140µm, the absorbance is larger than 90% in our interested frequency range of 0.51 to 3 THz and larger than 99% from 1.2 to 3 THz, better than existing silicon-based absorbers to our best knowledge. Although the efficiency of our sawtooth absorber can be further improved a little bit, we stop the height optimization process at h = 140µm, considering the fabrication difficulties for higher silicon sawtooth structure.…”

Section: -mentioning

confidence: 99%

“…30 Here we choose ω p = 2π × 5.22 THz and γ = 2π × 1.32 THz in our following structure design since doped silicon with these parameters had already been realized in reference. 25 The structure of our absorber are schematically shown in Fig. 1(a).…”

Section: The Performance Of Sawtooth-shaped Absorbermentioning

confidence: 99%

“…The latter two parameters are determined by the carrier concentration and mobility of the doped silicon, which can be obtained through either Hall Effect analysis 25 or THz reflection spectroscopy. 30 Here we choose ω p = 2π × 5.22 THz and γ = 2π × 1.32 THz in our following structure design since doped silicon with these parameters had already been realized in reference.…”

Section: The Performance Of Sawtooth-shaped Absorbermentioning

confidence: 99%

“…In order to get high-efficient polarization-insensitive and wide-angle operant THz absorbers, Cheng et al realized two-dimensional cross-shaped THz absorber 24 and Yin et al proposed a THz absorber using a square array of plastic-caped silicon. 25 However, the fabrication processes of these two-dimensional THz absorbers are complicated.…”

Section: Introductionmentioning

confidence: 99%

“…[4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] In the past few years, doped silicon has been introduced to improve the THz absorption efficiency and bandwidth. [22][23][24][25][26][27] As a desirable lossy material at THz frequency, doped silicon can support surface plasmon polaritons and accordingly localized surface plasmon resonances via periodic structures. The main advantage of semiconductor materials is that they can be easily processed using conventional micro-fabrication technology.…”

Section: Introductionmentioning

confidence: 99%

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A high-performance broadband terahertz absorber based on sawtooth-shape doped-silicon

Jiang

Zhai

et al. 2016

AIP Advances

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Perfect absorbers with broadband absorption of terahertz (THz) radiation are promising for applications in imaging and detection to enhance the contrast and sensitivity, as well as to provide concealment. Different from previous two-dimensional structures, here we put forward a new type of THz absorber based on sawtooth-shape doped-silicon with near-unit absorption across a broad spectral range. Absorbance over 99% is observed numerically from 1.2 to 3 THz by optimizing the geometric parameters of the sawtooth structure. Our absorbers can operate over a wide range of incident angle and are polarization insensitive. The underlying mechanisms due to the combination of an air-cavity mode and mode-matching resonance on the air-sawtooth interface are analyzed in terms of the field patterns and electromagnetic power loss features.

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Section: -mentioning

confidence: 99%

Section: The Performance Of Sawtooth-shaped Absorbermentioning

confidence: 99%

Section: The Performance Of Sawtooth-shaped Absorbermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A high-performance broadband terahertz absorber based on sawtooth-shape doped-silicon

Jiang

Zhai

et al. 2016

AIP Advances

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Strong Magnetic–Dielectric Synergistic Gradient Metamaterials for Boosting Superior Multispectral Ultra‐Broadband Absorption with Low‐Frequency Compatibility

Ma,

Liu,

Yang

et al. 2024

Adv Funct Materials

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The construction of 3D porous structures and metamaterials (MMs) is the most promising approaches to achieve broadband electromagnetic wave (EMW) absorption. However, it is still a huge challenge to achieve multispectral ultra‐broadband EMW absorption properties compatible with low‐frequency band (L‐ and S‐band) due to its ultralong wavelength and strong bypass capability. Herein, magnetic–dielectric synergistic gradient MMs (MDSGM) consisting of oriented flaky carbonyl iron (FCI) film and periodical RGO/CNT/CNF aerogel (GTFA) array are demonstrated. Benefiting from the synergistic effect of strong magnetic–dielectric loss, structural loss, and excellent impedance matching, MDSGM harvests an exciting multispectral ultra‐broadband EMW absorption performance with a remarkable effective absorption bandwidth covering the whole measured frequency of 1–40, 50–110 GHz, and 0.1–2.0 THz for the first time. The minimum RL (RLmin) reaches −40.24 dB and average RL is up to −19.3 dB (98.8% EMW being absorbed) in microwave band. Moreover, this multispectral ultra‐broadband EMW absorption property is less affected by the incident angle. This work pioneered realization of multispectral ultra‐broadband EMW absorption compatible with low‐frequency, which provides a great thrust for the development of stealth technology in the upcoming smart era.

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Subwavelength Optical Engineering with Metasurface Waves

Luo

2018

Advanced Optical Materials

167

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Figure 3. Plasmonic superlens and hyperlens. a) Plasmonic EYI effect in structured metal film. Adapted with permission. [46] Copyright 2004, American Institute of Physics (AIP). b) Schematic of the optical system for the demonstration of thin film superlens. Adapted with permission. [49] Figure 11. Multifunctional metasurfaces. a) The far-field intensity distribution of wave-fronts with positive (red) and negative (blue) helicities emerging from segmented, interleaved, and harmonic response metasurfaces composed of gap-plasmon nanoantennas (inset). Adapted with permission. [167] Copyright 2016, AAAS. b) Schematic of the generation of a solid and a hollow spot at two wavelengths and the calculated intensity distribution in the focal plane. Adapted with permission. [12]

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High-performance terahertz wave absorbers made of silicon-based metamaterials

Cited by 115 publications

References 28 publications

A high-performance broadband terahertz absorber based on sawtooth-shape doped-silicon

A high-performance broadband terahertz absorber based on sawtooth-shape doped-silicon

Strong Magnetic–Dielectric Synergistic Gradient Metamaterials for Boosting Superior Multispectral Ultra‐Broadband Absorption with Low‐Frequency Compatibility

Subwavelength Optical Engineering with Metasurface Waves

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