Dual-band tunable terahertz perfect metamaterial absorber based on strontium titanate (STO) resonator structure

Li, Wangyang; Cheng, Yongzhi

doi:10.1016/j.optcom.2020.125265

Cited by 122 publications

(51 citation statements)

References 52 publications

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“…As shown in Fig. 6(a), when increasing r, the resonance frequencies for both LCP and RCP waves decrease gradually, which can be interpreted by the equivalent LC resonance circuit theory [52,53]. The resonance frequencies for both LCP and RCP lights can be expressed as , where equivalent capacitance C and inductance L are mainly determined by the geometric parameters of the proposed PMSA.…”

Section: Resultsmentioning

confidence: 89%

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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Section: Resultsmentioning

confidence: 89%

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

Cheng

Chen

Luo

2020

Preprint

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“…Interference theory based on Fabry-Pérot-like resonance cavity can provide a profound understanding of the underlying physics for the proposed MMA. According to interference theory, the MMA can be considered as a Fabry-Pérot-like resonance cavity, which would induce multiple EM interference effects in multireflection in the incident terahertz waves [10][11][12][13][14]53]. The superposed multiple reflections would then destructively interfere with the direct reflection from the air-CGS graphene sheet and would finally result in high-level absorption [53].…”

Section: Resultsmentioning

confidence: 99%

“…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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“…Over the past few years, 2D materials, such as graphene and transition-metal dichalcogenides (TMDCs), have become the leading materials for numerous applications in modulators, optical detectors, metamaterial absorbers, and emitters due to their extraordinary electrical and optical characteristics, and also their ability to enhance light absorption with high temperature stability [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Tunable Broadband Solar Energy Absorber Based on Monolayer Transition Metal Dichalcogenides Materials Using Au Nanocubes

et al. 2020

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In order to significantly enhance the absorption capability of solar energy absorbers in the visible wavelength region, a novel monolayer molybdenum disulfide (MoS2)-based nanostructure was proposed. Local surface plasmon resonances (LSPRs) supported by Au nanocubes (NCs) can improve the absorption of monolayer MoS2. A theoretical simulation by a finite-difference time-domain method (FDTD) shows that the absorptions of proposed MoS2-based absorbers are above 94.0% and 99.7% at the resonant wavelengths of 422 and 545 nm, respectively. In addition, the optical properties of the proposed nanostructure can be tuned by the geometric parameters of the periodic Au nanocubes array, distributed Bragg mirror (DBR) and polarization angle of the incident light, which are of great pragmatic significance for improving the absorption efficiency and selectivity of monolayer MoS2. The absorber is also able to withstand a wide range of incident angles, showing polarization-independence. Similar design ideas can also be implemented to other transition-metal dichalcogenides (TMDCs) to strengthen the interaction between light and MoS2. This nanostructure is relatively simple to implement and has a potentially important application value in the development of high-efficiency solar energy absorbers and other optoelectronic devices.

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Dual-band tunable terahertz perfect metamaterial absorber based on strontium titanate (STO) resonator structure

Cited by 122 publications

References 52 publications

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

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

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

Tunable Broadband Solar Energy Absorber Based on Monolayer Transition Metal Dichalcogenides Materials Using Au Nanocubes

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