4.5 Review

A Review: The Functional Materials-Assisted Terahertz Metamaterial Absorbers and Polarization Converters

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A switchable terahertz device combining ultra-wideband absorption and ultra-wideband complete reflection

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Summary: This study proposes a terahertz metamaterial absorber that combines metamaterial structures and a VO2 film. Flexible switching of absorption performance and an ultra-broadband perfect absorption with a bandwidth of 3.3 THz can be achieved through temperature adjustment. The study also highlights the wide thermal tuning range of spectral absorbance.

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Wideband switchable dual-functional terahertz polarization converter based on vanadium dioxide-assisted metasurface

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Summary: Terahertz technology has gained significant attention due to its potential applications in various fields. This study presents a reflective dual-functional terahertz metadevice that combines two different polarization conversions using a switchable metasurface. The metadevice can function as a linear-to-linear polarization converter and a wideband linear-to-circular polarization converter, with high conversion ratios and large bandwidths.

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Thermal tuning of terahertz metamaterial absorber properties based on VO2

Zhipeng Zheng et al.

Summary: A novel and structurally simple multifunctional broadband absorber is presented, using the thermogenic phase change properties of vanadium dioxide material to flexibly adjust absorption intensity and achieve near-perfect absorption in an ultra-broadband range.

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Multi-mode surface plasmon resonance absorber based on dart-type single-layer graphene

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Terahertz absorption modulator with largely tunable bandwidth and intensity

Wenwen Liu et al.

Summary: A dual-tunable metamaterial absorption modulator has been proposed based on a hybrid vanadium dioxide-graphene configuration, allowing for dynamic adjustments of absorption intensity and frequency through external stimuli. The design consists of narrowband and broadband absorbers, which are polarization-insensitive for small incident angles.

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Wen Liu et al.

Summary: This paper presents a broadband metamaterial perfect absorber using both graphene and metal resonator elements. The absorber achieves wider absorption band with high absorption rate, polarization independence, and wide incident angle characteristics, which can be adjusted by changing the chemical potential of the graphene.

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Tunable terahertz circular polarization convertor based on graphene metamaterial

Yongzhi Cheng et al.

Summary: This paper presents a tunable terahertz circular-polarization (CP) convertor based on graphene metamaterial, which can achieve high efficiency polarization conversion at specific Fermi energy levels and be continuously adjusted for various applications.

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Tunable triple-band and broad-band convertible metamaterial absorber with bulk Dirac semimetal and vanadium dioxide

Shihao Ban et al.

Summary: A convertible metamaterial device based on BDS and VO2 is proposed, showcasing triple-band and broad-band absorption characteristics without altering structural parameters. The system allows for dynamic tuning of resonance frequency and absorption intensity in the THz range, opening up various potential applications.

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Dual-layer graphene based tunable broadband terahertz absorber relying on the coexistence of hybridization and stacking effects

Rong Lin et al.

Summary: The study introduces a dual-layer graphene THz absorber with high absorption rate in a wide THz frequency range and insensitivity to incident angle and polarization.

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Multi-functional polarization conversion manipulation via graphene-based metasurface reflectors

Houjiao Zhang et al.

Summary: This work presents an efficient polarization conversion device using a hollow graphene metasurface, which can achieve excellent performances such as broadband x-to-y cross polarization conversion, dual-frequency linear-to-circular polarization conversion, and highly sensitive polarization conversion function manipulation. Through tuning the Fermi energy of graphene, different polarization conversion functions can be switched, with a high frequency shift sensitivity observed.

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Ultra-wideband tunable metamaterial perfect absorber based on vanadium dioxide

Guozhang Wu et al.

Summary: The proposed ultra-wideband metamaterial perfect absorber based on vanadium dioxide shows a high terahertz absorption bandwidth and controllable absorption peak intensity. By optimizing the geometric structure and using interference cancellation and impedance matching theory, the absorber achieves better absorption performance and efficiency. It has wide-angle absorption effects in both TE and TM waves, making it suitable for various applications in modulation, sensing, and imaging technology.

OPTICS EXPRESS (2021)

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Polarization-dependent and tunable absorption of terahertz waves based on anisotropic metasurfaces

Jie Li et al.

Summary: A tunable and polarization-dependent terahertz metamaterial absorber is proposed, which can work for both linearly and circularly polarized waves, and achieve high absorption efficiency with wide-range tuning. The absorber demonstrates different tunable absorption performances for x- or y-polarized terahertz waves when VO2 is in insulating state, and behaves as a chiral absorber when VO2 is in metallic state. Efficient absorption is maintained with a large incident angle under the two working conditions. Additionally, the absorber is applied in tunable and polarization multiplexed near-field image display.

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Dynamically tunable narrowband anisotropic total absorption in monolayer black phosphorus based on critical coupling

Yong Li et al.

Summary: The study introduces a dynamically tunable anisotropic narrowband absorber based on monolayer black phosphorous and silicon grating in the terahertz band, featuring high absorption efficiency controlled by critical coupling conditions, exceptional tunability, intrinsic anisotropy, and ease of manufacturing.

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Graphene-based dual-band tunable perfect absorber in THz range

Zhaoyang Liu et al.

Summary: A tunable dual-band perfect absorber composed of graphene layer is designed and simulated, with the absorption peaks in the terahertz band. The position of absorption peak can be changed by adjusting the Fermi level and geometric parameters of the graphene pattern, and the absorber is insensitive to polarized incident light with wide incident angle. Such absorber can be applied in graphene-based photonic devices with lower manufacturing costs.

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Highly sensitive and tunable refractive index biosensor based on phase change material

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Summary: This study presents a tunable and highly sensitive absorbing metasurface based on phase-change material for sensing hemoglobin biomolecules. The research demonstrates that the metasurface is angle sensitive and responsive to different geometrical parameters.

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Tunable terahertz Dirac semimetal metamaterials

Xiaoyong He et al.

Summary: The tunable propagation properties of 3D Dirac semimetal patterned metamaterial structures in the terahertz regime have been symmetrically investigated. The results show that resonant properties are highly sensitive to the thicknesses of DSM MMs and support strong LC and dipolar resonances. By increasing the Fermi level, resonant strength becomes stronger, and asymmetrical resonators can achieve a very sharp Fano resonant peak with a large Q-factor.

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Tunable and polarization-sensitive graphene-based terahertz absorber with eight absorption bands

Yijun Cai et al.

Summary: A metamaterial absorber made of stacked and orthogonal elliptical graphene layers has been proposed to achieve eight absorption bands in the terahertz frequency range, with the ability to independently tune absorption peaks by adjusting the length of each graphene ellipse's short or long axis. The absorption spectrum can also be tuned by varying the chemical potential of each graphene ellipse and manipulating the polarization angle of the incidence. The absorber is also able to function properly under oblique incidences, paving the way for the design of tunable terahertz absorbers with multiple absorption bands.

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Dynamically tunable single-layer VO2/metasurface based THz cross-polarization converter

Riad Yahiaoui et al.

Summary: The research demonstrates a single-layer THz metadevice that can achieve cross polarization transmission and asymmetric transmission in the THz range. The transmission characteristics change with the conductivity of the material VO2, and a promising method for active sub-cycle dynamic tunability for THz polarization conversion using optical, electrical, or thermal switching is proposed.

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Terahertz broadband tunable reflective cross-polarization convertor based on complementary cross-shaped graphene metasurface

Yongzhi Cheng et al.

Summary: In this study, a broadband tunable reflective polarization convertor was proposed using a single layer complementary-cross-shaped (CCS) graphene metasurface, which can achieve high polarization conversion ratio at specific Fermi energy levels, with its performance regulated by varying the Fermi energy level.

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Dual-band terahertz metamaterial absorber using hexagon graphene structure

Zhonghao Lu et al.

Summary: A dual-band terahertz metamaterial absorber using a one-layer periodically patterned hexagon graphene structure is proposed in this study. By tuning the structural parameters or Fermi energy levels, the absorption bands can be changed to the required working frequencies. The absorber has the properties of polarization independence and incident angle insensitivity, making it suitable for applications in detecting and sensing systems.

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Wide-range tunable, dual-band, background refractive index insensitive terahertz absorber based on graphene and Dirac semimetal

Shuaizhao Wang et al.

Summary: In this study, a dual-band wide-range tunable terahertz absorber based on graphene and bulk Dirac semimetal (BDS) is proposed, achieving high absorption rates at 3.97 and 7.94 THz. The resonance frequency can be tuned by changing the Fermi energy of graphene and BDS, and the absorption is insensitive to changes in background refractive index, showing potential applications in various optoelectronic devices.

OPTICAL ENGINEERING (2021)

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Switchable dual-band to broadband terahertz metamaterial absorber incorporating a VO2 phase transition

Tingting Lv et al.

Summary: The article presents a thermally switchable terahertz metamaterial absorber based on VO2 phase transition, capable of switching absorption effects in different frequency bands, with polarization-dependency and absorption switching effects under metallic VO2 state at different polarization angles.

OPTICS EXPRESS (2021)

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Switchable Metamaterial With Terahertz Buffering and Absorbing Performance

Chenxi Liu et al.

Summary: This research demonstrates a terahertz metamaterial with the capability to switch between optical buffering and absorbing performance by incorporating a phase-change film of vanadium dioxide, achieving a slow light effect with a group delay of up to 3.5 ps. The switching mechanism is discussed through analysis of electric field and power loss distributions, as well as the impedance matching principle, offering potential applications in terahertz detecting, switching, and slow light devices.

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Reflective triple-band line-to-circular polarization conversion based on diamond-shaped graphene metasurface

Yongqi Liu et al.

Summary: This paper presents a triple-band line-to-circular (LTC) polarization converter based on a graphene-integrated metasurface, with two LTC polarization bands at 0.36 and 0.44 THz and one at 2.23 THz. Two graphene surface plasmons (GSPs) modes were excited, responsible for the three LTC bands. The triple-band polarization converter can be realized within incidence angles ranging from 0 to 30 degrees and polarization angles ranging from 0 to 9 degrees.

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Asymmetric transmission polarization conversion of chiral metamaterials with controllable switches based on VO2

Fei Lv et al.

Summary: A controllable switch-type chiral metamaterial has been proposed to achieve asymmetric transmission (AT) polarization conversion using the phase change characteristics of vanadium dioxide (VO2). The function achieves extremely low ellipticity, 90 degrees polarization azimuth, and higher than 90% polarization conversion rate in specific frequency bands. The physical and internal mechanisms of the switching function are explained through surface current distribution and chirality parameters comparison.

OPTICAL MATERIALS (2021)

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Tunable reflective dual-band line-to-circular polarization convertor with opposite handedness based on graphene metasurfaces

Yu Fu et al.

Summary: This study proposes a dual-band tunable reflective linear-to-circular polarization converter, consisting of a graphene sheet etched with an I-shaped carved-hollow array, which can simultaneously achieve two bands of linear-to-right-circular-polarization and linear-to-left-circular-polarization. The tunable responses of the frequency bands can be achieved by adjusting the Fermi energy and electron scattering time.

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Quad-band polarization-insensitive metamaterial perfect absorber based on bilayer graphene metasurface

Pouria Zamzam et al.

Summary: This paper presents a quad-band, polarization-insensitive metamaterial perfect absorber based on bi-layer graphene. By stacking the double layer graphene metasurface, a quad-band perfect absorber with an average absorption of 99.43% at four different frequencies is achieved. The proposed structure has advantages of tunable resonant frequency, polarization insensitivity, and tolerance to incident angles, showing potential in filtering, detection, imaging, and photodetector applications.

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Dynamically Switchable Polarization-Independent Triple-Band Perfect Metamaterial Absorber Using a Phase-Change Material in the Mid-Infrared (MIR) Region

Dongdong Xu et al.

Summary: A tunable metamaterial absorber in the mid-infrared regime was theoretically investigated, revealing that the combination of inlaid metal-medium dielectric waveguide mode and resonant cavity mode, as well as excitation of propagating surface plasmon mode, are the main reasons for triple-band high absorption. Through reversible phase transitions, the transition from high absorption to high reflection in the mid-infrared region was achieved, with near unity absorption efficiency maintained by incidence angles up to 60 degrees.

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Broadband switchable terahertz half-/quarter-wave plate based on VO2-metal hybrid metasurface with over/underdamped transition

Xiaoqing Luo et al.

Summary: A novel design strategy for dynamically switchable half-/quarter-wave plates using a VO2-metal hybrid metasurface has been proposed in this study. Simulation results demonstrate that the proposed metasurface can achieve efficient switching performance in the frequency range of 0.8-1.2 THz.

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Coordination multi-band absorbers with patterned irrelevant graphene patches based on multi-layer film structures

Zhiyu Bao et al.

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Multi-parameter tunable terahertz absorber based on graphene and vanadium dioxide

Qing Zhe Wang et al.

Summary: This article describes a novel THz metamaterial absorber based on graphene and vanadium dioxide (VO2) that can switch between single-band, dual-band, and broadband absorption modes. By controlling the material states and Fermi level, the absorber achieves expanded bandwidth and higher adjustability.

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Broadband and switchable terahertz polarization converter based on graphene metasurfaces

Rui Zhang et al.

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Terahertz absorber with dynamically switchable dual-broadband based on a hybrid metamaterial with vanadium dioxide and graphene

Yan Liu et al.

Summary: An absorber based on hybrid metamaterial with vanadium dioxide and graphene achieves dynamically switchable dual-broadband absorption in the terahertz regime by controlling the phase transition of vanadium dioxide and the Fermi energy level of graphene. The absorber can achieve high absorptance in high-frequency broadband and low-frequency broadband, with the absorption intensity being continuously adjustable by electrically controlling the Fermi energy level of graphene. The absorption window can be further broadened by adjusting geometrical parameters, making the absorber suitable for applications such as filtering, sensing, cloaking objects, and switches in the terahertz regime.

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Polarization independent and non-reciprocal absorption in multi-layer anisotropic black phosphorus metamaterials

Zhihui He et al.

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Multi-functional high-efficiency reflective polarization converter based on an ultra-thin graphene metasurface in the THz band

Mahsa Barkabian et al.

Summary: An ultra-thin reflective metasurface is proposed for polarization conversion in the terahertz band, utilizing graphene ribbons on a silicon substrate. By changing the chemical potential of graphene, the structure functions as linear and circular polarization converters. Simulation results show high efficiency and potential applications in imaging, sensing, communication, and optical technologies.

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Multiple interference theoretical model for graphene metamaterial-based tunable broadband terahertz linear polarization converter design and optimization

Rong Lin et al.

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