Narrowband Metamaterial Absorber for Terahertz Secure Labeling

Nasr, Magued B.; Richard, Jonathan T.; Skirlo, Scott A.; Heimbeck, Martin S.; Joannopoulos, John D.; Soljačić, Marin; Everitt, Henry O.; Domash, Lawrence H.

doi:10.1007/s10762-017-0389-7

Cited by 15 publications

(4 citation statements)

References 17 publications

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“…After Landy et al creatively proposed a perfect metamaterial absorber in 2008 [ 6 ], various kinds of absorbers have been proposed and studied. For example, absorbers with periodic arrays of metallic square ring/cross/hash-shaped resonators, circular split rings, combined metamaterial structures, 3D TiN nanopillars, and all-dielectric metasurfaces were proposed to achieve single narrowband, dual/multi-narrowband, and broadband perfect absorption [ 3 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 ]. However, these metamaterial or metasurface absorbers consist of normal metals and dielectric materials, which have the inherent drawback of non-adjustability after fabrication.…”

Section: Introductionmentioning

confidence: 99%

Electrically Tunable Broadband Terahertz Absorption with Hybrid-Patterned Graphene Metasurfaces

Chen

Cai

et al. 2018

Nanomaterials

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We numerically demonstrate a broadband terahertz (THz) absorber that is based on a hybrid-patterned graphene metasurface with excellent properties of polarization insensitivity, wide-angle, and active tunability. Our design is made up of a single-layer graphene with periodically arranged hybrid square/disk/loop patterns on a multilayer structure. We find that broadband absorption with 90% terahertz absorbance and the fractional bandwidth of 84.5% from 1.38 THz to 3.4 THz can be achieved. Because of the axisymmetric configuration, the absorber demonstrates absolute polarization independence for both transverse electric (TE) and transverse magnetic (TM) polarized terahertz waves under normal incidence. We also show that a bandwidth of 60% absorbance still remains 2.7 THz, ranging from 1.3 THz to 4 THz, for a wide incident angle ranging from 0° to 60°. Finally, we find that by changing the graphene Fermi energy from 0.7 eV to 0 eV, the absorbance of the absorbers can be easily tuned from more than 90% to lower than 20%. The proposed absorber may have promising applications in terahertz sensing, detecting, imaging, and cloaking.

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Section: Introductionmentioning

confidence: 99%

Electrically Tunable Broadband Terahertz Absorption with Hybrid-Patterned Graphene Metasurfaces

Chen

Cai

et al. 2018

Nanomaterials

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“…Most of the proposed perfect absorbers only absorb specific frequency bands that cannot not be adjusted [20][21][22][23][24][25][26]. The absorption bandwidth of this type of absorber is not wide enough, which means that the designed absorber has limited functions.…”

Section: Introductionmentioning

confidence: 99%

Grating Structure Broadband Absorber Based on Gallium Arsenide and Titanium

et al. 2022

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We designed a broadband absorber based on a multilayer grating structure composed of gallium arsenide and titanium. The basic unit is a grating structure stacked on top of a semiconductor of gallium arsenide and titanium metal. We used the finite difference time domain method to simulate the designed model and found that the absorber absorption efficiency exceeded 90% in the range from 736 nm to 3171 nm. The absorption efficiency near perfect absorption at 867 nm was 99.69%. The structure had good angle insensitivity, and could maintain good absorption under both the TE mode and TM mode polarized light when the incident angle of the light source changed from 0° to 50°. This kind of metamaterial grating perfect absorber is expected to be widely used in optical fields such as infrared detection, optical sensing, and thermal electronics.

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“…Terahertz wave metamaterial absorbers (MMAs) have recently attracted great attention and become one of the widespread research hotspots due to their promising applications in communication, imaging, detection and sensing, and stealth [1][2][3][4][5]. In the past few years, a great number of terahertz MMAs based on various resonator structures have been proposed to achieve single narrowband, dual or multi-narrowband, and broadband absorption [6][7][8][9][10][11][12]. MMAs exhibiting high absorption performance are usually realized by periodic array structures consisting of lossy materials that can effectively confine and consume the incident electromagnetic (EM) fields [1,13,14].…”

Section: Introductionmentioning

confidence: 99%

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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Narrowband Metamaterial Absorber for Terahertz Secure Labeling

Cited by 15 publications

References 17 publications

Electrically Tunable Broadband Terahertz Absorption with Hybrid-Patterned Graphene Metasurfaces

Electrically Tunable Broadband Terahertz Absorption with Hybrid-Patterned Graphene Metasurfaces

Grating Structure Broadband Absorber Based on Gallium Arsenide and Titanium

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

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