A Tunable Triple-Band Near-Infrared Metamaterial Absorber Based on Au Nano-Cuboids Array

Qin, Feng; Chen, Zeqiang; Chen, Xifang; Yi, Zao; Yao, Weitang; Duan, Tao; Wu, Pinghui; Yang, Hua; Li, Gongfa; Yi, Yougen

doi:10.3390/nano10020207

Cited by 109 publications

(45 citation statements)

References 69 publications

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“…In Figure 3a,b, it can be seen that the two observed absorption peaks essentially originate from the fundamental and second order graphene SPP resonances, respectively. In addition, it can also be seen that the electric fields near the interface area between the graphene and PDMS substrate are composed of propagating waves related to the far-field interaction and evanescent waves, which correspond to the near-field interaction effect [50][51][52]. In summary, it can be concluded that the stronger electric field confinement characteristics of the unit cell structure above are consistent with the absorbance spectra shown in Figure 2a.…”

Section: Resultssupporting

confidence: 78%

A Broadband Tunable Terahertz Metamaterial Absorber Based on Single-Layer Complementary Gammadion-Shaped Graphene

2020

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We present a simple design of a broadband tunable metamaterial absorber (MMA) in the terahertz (THz) region, which consists of a single layer complementary gammadion-shaped (CGS) graphene sheet and a polydimethylsiloxane (PDMS) dielectric substrate placed on a continuous metal film. The Fermi energy level (E f ) of the graphene can be modulated dynamically by the applied DC bias voltage, which enables us to electrically control the absorption performance of the proposed MMA flexibly. When E f = 0.8 eV, the relative bandwidth of the proposed MMA, which represents the frequency region of absorption beyond 90%, can reaches its maximal value of 72.1%. Simulated electric field distributions reveal that the broadband absorption mainly originates from the excitation of surface plasmon polaritons (SPPs) on the CGS graphene sheet. Furthermore, the proposed MMA is polarization-insensitive and has wide angles for both transverse-electric (TE) and transverse-magnetic (TM) waves in the broadband frequency range. The broadband absorption capacity of the designed MMA can be effectively adjusted by varying the Fermi energy level of graphene. Lastly, the absorbance of the MMA can be adjusted from 42% to 99.1% by changing the E f from 0 eV to 0.8 eV, which is in agreement with the theoretical calculation by using the interference 41theory. Due to its simple structure and flexible tunability, the proposed MMA has potential application prospects in tunable filtering, modulators, sensing, and other multispectral devices.Materials 2020, 13, 860 2 of 11 candidate material because of its unique properties, including optical transparency, electron mobility, and excellent mechanical properties [15][16][17][18]. The most attractive property is that the permittivity and conductivity of graphene can be dynamically tuned by changing the Fermi energy through chemical doping or external bias voltage, achieving dynamically tunable MMAs [19][20][21].In the last few years, MMAs based on graphene have received increasing interest and have achieved tremendous progress. Various MMAs based on patterned graphene structures, such as disks [21], ribbons [22,23], patches [24], cross fishnets [25], and other microstructures [26][27][28][29][30][31], have been proposed to enhance the absorption. It is believed that the perfect absorption of the graphene-based MMA is mainly originated from excitation of surface plasmon resonances (SPRs) in the periodic patterned graphene structures. However, most of these MMAs are usually narrowband, which greatly limits their applications in some circumstances. Numerous efforts have been made to realize multi-and broadband absorption by various methods, including multilayer graphene structures [32], multiple graphene resonators in a unit cell [33], structured graphene with gradually changing geometric sizes [34], and other hybrid-patterned metal-graphene composite structures [33][34][35][36][37]. Although the broad absorption bandwidth of the MMAs can be enhanced, most of them still suffer from some drawbacks, including dif...

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Section: Resultssupporting

confidence: 78%

A Broadband Tunable Terahertz Metamaterial Absorber Based on Single-Layer Complementary Gammadion-Shaped Graphene

2020

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“…The excitation of surface plasmons resonance will produce oscillating dipole elds due to the semicircle nanostructure with small diameters relative to the incident wavelength of the different CP lights [43][44][45][46]. When RCP or LCP light excites the semicircle nanostructure, a chiral-selective absorption and giant CD effect will occur, and the electric eld and magnetic eld components of each layer are different due to the chirality [46][47][48][49][50][51]. charges are separated and mainly accumulated at the corners of the each semicircle nanostructure, acting like an electric dipole.…”

Section: Resultsmentioning

confidence: 99%

Chiral-selective Plasmonic Metasurface Absorber Based on Bilayer Fourfold Twisted Semicircle Nanostructure at Optical Frequency

Cheng

Chen

Luo

2020

Preprint

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In this paper, we demonstrate theoretically a plasmonic metasurface absorber (PMSA) for the high chiral-selective absorption for right-handed and left-handed circular polarization (RCP and LCP) lights at optical frequency. The PMSA is composed of a dielectric substrate sandwiched with bi-layer fourfold twisted semicircle nanostructure. Numerical simulation results that the proposed PMSA has a strong chiral selective absorption bands, where absorption peaks for LCP and RCP lights occur at different resonance frequencies resulting in significant circular dichroism (CD) effect. It is shown that the maximum absorbance of the PMSA can reach to 93.2% for LCP light and 91.6% for RCP light, and that the maximum CD magnitude is about 0.85 and 0.91 around 288.5 THz and 404 THz, respectively. The mechanism of the strong chiroptical response of the PMSA is illustrated and revealed by electric fields distributions. Furthermore, the influence of the geometry of the proposed PMSA on the chiral-selective absorption characterization is studied systematically. Due to the strong chiral-selective absorption and CD effect, the proposed PMSA can be found many potential applications in some areas, such as chiral imaging, optical filters, detecting, and optical communications.PACS numbers: 42.25.Bs, 78.20.−e

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“…That is to say, the larger the imaginary part of permittivity is, the greater the loss of light is. However, noble metals just can arouse very narrow absorption peaks owing to its small imaginary part of permittivity [34]. On the contrary, refractory metals can cause higher light absorption within broadband because of its large imaginary part of permittivity [35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Ultra-Broadband High-Efficiency Solar Absorber Based on Double-Size Cross-Shaped Refractory Metals

Niu

Zhang

et al. 2020

Nanomaterials

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In this paper, a theoretical simulation based on a finite-difference time-domain method (FDTD) shows that the solar absorber can reach ultra-broadband and high-efficiency by refractory metals titanium (Ti) and titanium nitride (TiN). In the absorption spectrum of double-size cross-shaped absorber, the absorption bandwidth of more than 90% is 1182 nm (415.648-1597.39 nm). Through the analysis of the field distribution, we know the physical mechanism is the combined action of propagating plasmon resonance and local surface plasmon resonance. After that, the paper has a discussion about the influence of different structure parameters, polarization angle and angle of incident light on the absorptivity of the absorber. At last, the absorption spectrum of the absorber under the standard spectrum of solar radiance Air Mass 1.5 (AM1.5) is studied. The absorber we proposed can be used in solar energy absorber, thermal photovoltaics, hot-electron devices and so on.

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A Tunable Triple-Band Near-Infrared Metamaterial Absorber Based on Au Nano-Cuboids Array

Cited by 109 publications

References 69 publications

A Broadband Tunable Terahertz Metamaterial Absorber Based on Single-Layer Complementary Gammadion-Shaped Graphene

A Broadband Tunable Terahertz Metamaterial Absorber Based on Single-Layer Complementary Gammadion-Shaped Graphene

Chiral-selective Plasmonic Metasurface Absorber Based on Bilayer Fourfold Twisted Semicircle Nanostructure at Optical Frequency

Ultra-Broadband High-Efficiency Solar Absorber Based on Double-Size Cross-Shaped Refractory Metals

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