Yongzhi Cheng

Wuhan University of Science and Technology · School of information Science and Engineering

In this paper, a narrowband perfect metasurface absorber (MSA) based on micro-ring-shaped structure GaAs array was proposed and investigated theoretically in terahertz (THz) region, which can be applicable for the enhanced refractive index (RI) sensing. Simulation results show that the proposed perfect MSA can achieve an absorbance of 99.9% at 2.21...

In this work, a wideband circular polarization (CP) metasurface (MS) antenna is proposed, which is composed of a centrosymmetric structure with mode suppressor and an asymmetric aperture coupled feed structure separated by dielectric substrates. Based on characteristic mode theory (CMT), the aperture coupled feed structure consisted of a L-shape sl...

In this study, we numerically demonstrate how the response of recently reported circuit-based metasurfaces is characterized by their circuit parameters. These metasurfaces, which include a set of four diodes as a full wave rectifier, are capable of sensing different waves even at the same frequency in response to the incident waveform, or more spec...

In this paper, a notched-wideband (NWB) bandpass filter (BPF) based on the spoof surface plasmon polaritons (SSPPs) with loaded resonator structure is proposed in microwave region. The design of the NWB BPF consists of a U-shaped SSPPs transmission line embedded with 山-shaped resonator structures, dielectric substrate, and metal ground-plane. The l...

High-performance microwave absorption materials are considered to be an effective solution to the increasing electromagnetic pollution. In this work, Ti3C2Tx [email protected] double hydroxide (NiFe-LDH) derived multi-interfacial FeNi3/[email protected] carbon (NC)@magnetic multiwalled carbon nanotube composites were prepared by a hydrothermal proc...

In this paper, a broadband and thermally switchable reflective metasurface based on InSb Z-shape resonator (ZSR) structure was proposed for the vortex beam generation in terahertz (THz) region. Numerical simulation results indicate that the operation frequency range and efficiency will be basically unchanged when the external environment temperatur...

Broadband metamaterial absorber (MMA) with optically transparent property is essential for solving the electromagnetic pollution problem at gigahertz. In this work, we designed and prepared a sandwich MMA consisting of high-transmittance substrate polymethyl methacrylate (PMMA), a periodically arranged indium tin oxide (ITO) film, and a low resisti...

A temperature‐tunable terahertz (THz) perfect absorber (PA) composed of a periodic array of deep subwavelength micro‐cross‐shaped (MCS) structures of the strontium titanate (STO) resonator is proposed and investigated theoretically, which can be applicable for the temperature sensing. Simulation results indicate that the absorbance of 99.8% at 0.22...

This paper proposes a dual-band high-gain microstrip antenna with a reflective metasurface (MS). The initial designed coaxial-fed laminated microstrip antenna can realize linear polarization (LP) radiation at the lower frequency of 5 GHz and circular polarization (CP) radiation at the higher frequency of 11 GHz, with a relatively low gain of about...

In this paper, we present a simple design of six-band terahertz (THz) perfect metasurface absorber (PMSA) composed of a single circular-split-ring (CSR) structure placed over a ground-plane by a dielectric substrate. The average absorbance of 99.1% at six distinct frequencies can be obtained for the proposed PMSA under normal incident THz wave. The...

A dual-band terahertz (THz) perfect absorber (PA) based on the all-dielectric metamaterial (MM) composed of the vertical-square-split-ring (VSSR) structure InSb array was proposed and investigated numerically. Simulation results show that the absorbance of the proposed PA under room temperature T = 295 K is up to 99.9% and 99.8% at 1.265 THz and 1....

A transmission‐type metasurface (MS) based on the combined geometric and transmission phase is proposed and investigated here numerically, which can achieve independently manipulation of the circular polarization (CP) and linear polarization (LP) wavefront at terahertz (THz) region. The unit‐cell of the proposed MS is composed of the dielectric sub...

A multilayer metamaterial absorber (MMA) with optically transparent and broadband microwave absorption characteristics based on Indium Tin Oxide (ITO) and polymethyl methacrylate (PMMA) was designed and fabricated. The microwave absorption properties can be regulated by the resistance of ITO and the structural parameters of the unit cell. In the fr...

In this paper, an all-metal metasurface (MS), which can achieve high-efficient reflective circular-polarization conversion and multifunctional terahertz (THz) wavefront manipulation in an ultra-broadband frequency range, is proposed and investigated theoretically. The proposed all-metal MS consists of the periodic array of a gold vertical-split-rin...

One of the considerable disadvantages of a metasurface (MS) is frequency-dependent behavior, which largely restricts its practical applications. To overcome this challenge, a MS is designed to generate vortex beams at three distinct terahertz (THz) frequencies. Specifically, a unit-cell structure comprising three resonators is proposed to operate a...

A high-gain bidirectional radiative circular polarization (CP) antenna loaded with a dual-mode focusing metasurface (MS) is proposed. The original microstrip patch antenna consists of two coaxially fed tangential patches with different sizes, enabling CP radiation at 8.15 GHz and 14.8 GHz with the gain of 5.4 dBic and 6.2 dBic, respectively. The un...

Developing high-performance microwave absorbing materials is still a challenge to address the electromagnetic pollution. Interfacial engineering to heighten interfacial polarization plays a key role in microwave absorption. In this work, Multiple interfacial magnetic carbon nanotubes encapsulated hydrangea-like NiMo/MoC/N-doped carbon were prepared...

In this paper, a broadband reflective dual-functional polarization convertor based on all-metal anisotropic metasurface was proposed and investigated numerically in visible region. The unit-cell of the all-metal anisotropic metasurface based polarization convertor is composed of the Au ellipse nanostructure adhered on an Au substrate. The proposed...

A broadband metamaterial absorber (MMA) with optical transmittance property was designed to address the electromagnetic (EM) pollution in gigahertz (GHz). The proposed MMA with high optical transmittance polymethyl methacrylate (PMMA) between a periodic arrayed indium tin oxide (ITO) film and a low-resistivity ITO reflective layer. Over 90% microwa...

High-performance microwave absorbing materials (MAMs) play a vital role in electromagnetic (EM) pollution protection. Multi-interfacial heterogeneous structure design has become a mainstream direction for designing and fabricating excellent MAMs. Herein, multi-interfacial hollow core-shelled yttrium aluminum [email protected] carbon ([email protect...

A compact microwave bandpass filter with fishbone-shaped and hourglass-shaped groove structures based on substrate integrated plasmonic waveguide (SIPW) and spoof surface plasmon polariton (SSPP) is proposed and investigated. The dispersion and transmission characteristics of the proposed unit-cell structures of SSPP and SIPW were analyzed numerica...

In this work, a high-efficiency full-space metasurface (MS) is demonstrated numerically, which can independently manipulate the transmitted linear polarization (LP) and the reflected circular polarization (CP) wavefront based on the transmission and geometric phase at terahertz (THz) range. The unit-cell of the full-space MS is composed of a C-shap...

Metasurfaces (MSs) have received great attention due to their wide application potentials in terahertz (THz) wavefront manipulation. Although great achievements have been obtained in MSs so far, the functionalities are almost static. The active adjustable MS-based devices are far less explored. In this paper, an efficiency adjustable MS composed of...

In this paper, we present an effective design of a tri-band high-efficiency circular polarization (CP) convertor based on double-split-ring resonator (DSRR) structures in the microwave region. The proposed CP convertor is composed of a periodic array of sub-wavelength tri-layered DSRR structures separated by a dielectric spacer, which can convert t...

In this work, a high-gain and wideband microstrip-fed slot antenna is proposed and investigated, which is composed of an anisotropic metasurface (AMS) and an aperture coupled structure. The proposed microstrip antenna with four resonances can be obtained by merging the AMS with an anomalous inverted π-slot feed structure in a low profile (1.07λ × 1...

In this paper, we present a plasmonic chiral metasurface absorber (CMSA), which can achieve high selective absorption for right-handed and left-handed circular polarization (RCP, “+”, and LCP, “−”) lights at optical frequency. The CMSA is composed of a dielectric substrate sandwiched with bi-layer fourfold twisted semicircle metal nanostructure. Th...

Microwave absorbing materials with excellent electromagnetic wave attenuation have been applied to address electromagnetic pollution. In this work, bimetallic CoFe- [email protected]3C2Tx MXene derived multiple-interfacial composites with controllable structures were prepared via solvothermal, electrostatic self-assembly and thermal treatment. The...

Exploring excellent microwave absorbing materials (MAMs) to manage the electromagnetic (EM) radiation and interference is still a grand challenge nowadays. In this work, NiFe Prussian blue analogues (NiFe-PBA) embedded in polyacrylonitrile (PAN) fibers is prepared by electrospinning, and the derived NiFe nanoparticles embedded in nitrogen doped car...

In this paper, a graphene metasurface based on split-ring resonators (SRRs) structure has been proposed and investigated numerically, which can achieve the highly efficiency switchability of anomalous refraction and planar focuing effects. Numerical simulation results indicated that the proposed graphene metasurface could not only realize polarizat...

In this paper, a tunable terahertz circular-polarization (CP) convertor based on anisotropic graphene metamaterial is proposed and investigated numerically and theoretically. The unit-cell of the CP convertor is composed of a sub-wavelength metal grating sandwiched with bi-layered complementary-oval-shaped (COS) graphene array sheet. The electric p...

In this paper, a terahertz perfect absorber (PA) made of all-dielectric metasurface with periodic sub-wavelength InSb micro-rod array in terahertz (THz) region was proposed, which can be functioned for temperature and refractive index (RI) sensing application simultaneously. Simulation results show that the absorbance of 99.9% at 1.757 THz and the...

In this work, a broadband tunable reflective polarization convertor using a single layer complementary-cross-shaped (CCS) graphene metasurface was proposed and investigated numerically in terahertz (THz) region. The electric property of CCS graphene could be flexibly tuned through the Fermi energy level (Ef). When Ef = 0.9 eV, the proposed graphene...

We numerically demonstrate an optically switchable broadband metasurface absorber (MSA) structure based on planar patterned photoconductive silicon (Si) in terahertz (THz) region. The designed MSA is composed of planar-square-ring-shaped (PSRS) structure photoconductive Si array placed over a ground-plane separated by a dielectric substrate. The el...

In this work, a thermally tunable dielectric metasurface (DMS) composed of InSb cylindrical micropillars is proposed to generate vortex beam in the terahertz region. The full 2 π phase shift could be realized at resonance frequency for the incident linearly polarized wave by changing the diameter of InSb cylindrical micropillars. In addition, the r...

In this paper, a high-gain and wideband circular polarization (CP) patch antenna using reflective focusing metasurface was proposed and demonstrated. The initial design of patch antenna is made of a slot planar patch radiation part fed by coplanar waveguide (CPW). The simulated return loss below -10 dB of the initial design is from 6.2 to 13.8 GHz...

A quad-band plasmonic perfect absorber (PPA) based on all-metal nanostructure metasurface in infrared regime has been proposed and investigated numerically, which could be applicable for refractive index (RI) sensing. The proposed PPA is made of all-metal nanostructure with an assembly array of vertical split-ring and multiple cylinders. The propos...

Metal-organic frameworks (MOFs) derivative have drawn extensive attention in the field of microwave absorption for their various structure morphologies, low density and large surface areas. Herein, a novel multi-interfacial Nickel/Nickel phosphide composite embedded in N-doped carbon (Ni/[email protected]) were successfully fabricated. The composit...

A simple design of triple-band perfect light absorber (PLA) based on hybrid metasurface in visible region has been presented in this work, which turns out to be applicable for refractive index (RI) sensing. Distinct from previous designs, the proposed hybrid metasurface for visible PLA is only consisted of periodic silicon cross nanostructure array...

It has been demonstrated that metasurfaces have the ability to manipulate the wavefront. However, most multifunctional metasurfaces reported to date only operate in either reflection or transmission mode. In this paper, a bilayer metasurface based on geometric phase is proposed to independently tailor the wavefronts of transmitted and reflected cir...

We present a simple design for a broadband tunable terahertz metasurface absorber (MSA), which is composed of a periodic array of complementary-wheel-shaped (CWS) graphene sheets and a lossy polyimide layer backed with a ground-plane. Numerical simulation results show that the absorbance of the proposed MSA achieves over 90% for the frequency range...

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 si...

In this paper, we present a plasmonic chiral metasurface absorber (CMSA), which can achieve the high selective absorption for right-handed and left-handed circular polarization (RCP, “+”, and LCP, “-”) lights at optical frequency. The CMSA is composed of a dielectric substrate sandwiched with bi-layer fourfold twisted semicircle metal nanostructure...

Aimed at broadband microwave absorption, we present the linear polarization conversion metasurface (MS) by a novel design of a two-bit matrix-type coding method. The coding patterns are applied to a dielectric substrate and a magnetic substrate. The radar cross section (RCS) reduction curves of different matrices can fully verify the independence a...

In this paper, we present a novel design of broadband metamaterial microwave absorber (MWA) based on asymmetric sectional resonator structures (SRSs), which has been verified by simulation, calculation based on circuit theory, and experiment. The broadband perfect absorption of the MWA can be obtained by assembling four asymmetric SRSs with differe...

We present a three-dimensional (3D) perfect metamaterial absorber (PMA) for temperature sensing application in terahertz region. The PMA consists of a 3D metal resonator structure array and a continuous metal film separated by an indium antimonide (InSb) layer. The numerical simulations demonstrate that the PMA can achieve perfect absorption (about...

A temperature-controlled dual-band terahertz perfect metamaterial absorber (MMA) based on strontium titanate (STO) resonator structure is proposed and investigated numerically. This MMA is a simple periodic array, consisting of two stacked square-shaped STO resonator structures and a copper substrate. Numerical simulation results indicate that the...

A narrow-band metasurface absorber (MSA) based on InSb micro-cylinder arrays has been proposed and investigated numerically, which could be believed to be applicable for both temperature and refractive index (RI) sensing in terahertz (THz) region. Distinct from previous designs, the narrow-band MSA is only consisted of a sub-wavelength periodic mic...

In this paper, we present a novel design of temperature tunable metasurface absorber (MSA) based on all dielectric indium antimonide (InSb) resonator structure in terahertz (THz) region. The permittivity of the InSb dielectric is dependent on the variation of temperature. Based on the perfect impedance-match (Re(z)≈1) to the free space, the absorba...

In this paper, a compact and low-frequency broadband microwave metamaterial absorber (MMA) based on meander wire structure loaded with lumped resistor has been proposed and investigated numerically and experimentally. Compared with the single meander wire structure, the bandwidth and absorption level of the proposed MMA loaded with lumped resistors...

Plasmonic circular dichroism (CD) effect has been drawn great attention increasingly for its wide application in the fields of bio-sensing, biological detection, pharmaceuticals, and analytical chemistry. In this paper, we propose a chiral metasurface (CMS) to achieve strong multi-band CD effect at optical frequency. The designed CMS is composed of...

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 (Ef) of the graphene can be modulated dynam...

Far-infrared absorbers exhibiting wideband performance are in great demand in numerous applications, including imaging, detection, and wireless communications. Here, a nonresonant far-infrared absorber with ultra-wideband operation is proposed. This absorber is in the form of inverted pyramidal cavities etched into moderately doped silicon. By mean...

Due to the unique optical properties of gold nanomaterials, the preparation of gold nanomaterials with excellent chirality has received extensive attention. In order to develop a simple fabrication method for three-dimensional chiral Au nanostructure with a size of several hundred nanometers, chiral gold nanoparticles were developed to transfer chi...

In this paper, a dual-band and high-efficiency circular polarization (CP) convertor based on anisotropic metamaterial (AMM) was proposed and investigated in microwave region. The proposed AMM based CP convertor is composed of a sub-wavelength metal grating sandwiched with bi-layered disk-split-ring (DSR) structure array, which can convert the norma...

We present a broadband plasmonic absorber (PA) based on all silicon nanostructure resonators in visible region, which can be functioned as metamaterial (MM) blackbody for nearly all light radiation. Distinct from previous designs, the proposed PA is only consisted of periodic all silicon circular-split-ring (CSR) nanostructure resonators array adhe...

Electromagnetic (EM) interference and radiation affecting people’s health and the operation of precision electronic devices have attracted considerable attentions in recent years. Herein, a promising microwave absorbing material Ag nanoparticles (AgNPs)-decorated Fe/[email protected] carbon (NC) composite was designed and fabricated with the [email...

In this paper, a broadband and high-efficient tri-layered chiral structure metasurface (CSM) for linear polarization conversion and multi-functional wavefront manipulation was proposed and investigated numerically in terahertz region. The unit-cell of the proposed CSM consist of two orthogonal metal wires sandwiched with square split-ring resonator...

We present a photo-excited complementary chiral metamaterial (CCMM), which could realize a broadband dynamically switchable linear polarization conversion and asymmetric transmission (AT) effect for terahertz (THz) waves. The unit-cell structure of the photo-excited CCMM is composed of a bi-layer twisted complementary cut-wire (CCW) structure integ...

Although carbonyl iron powders (CIP) have already been used as microwave absorbing material for human health, wireless communication safety and defense stealth technology, it is difficult to implement both thin coating thickness and broadband absorption capability. Herein, core-shell structured [email protected]2@Nitrogen doped carbon (NC) microsph...

In this paper, we present a novel design of a dual-band metasurface absorber (MSA) in terahertz (THz) regions based on a bilayer all-dielectric polydimethylsiloxane (PDMS) resonator structure. Based on the perfect impedance-matched (Re(z)≈1) to the free space, the absorbance of 99.6% and 99.9% can be achieved at 2.167 THz and 2.452 THz. The dual-ba...

A simple and effective polarization-insensitive triple narrow-band plasmonic perfect absorber is proposed and investigated numerically. This device can serve as an ultra-sensitive refractive index sensor from the near-infrared to the visible region. The triple narrow-band perfect absorber consists of a structured metal film constructed with an asse...

In this paper, we present the design, simulation, measurement and characterization of a seven-band polarization-insensitive and wide-angle metamaterial absorber (MMA) in the microwave frequency region. The unit-cell structure of the designed MMA is composed of a single closed-meander-wire resonator structure placed over a metal ground plane by a di...

Nitrogen-doped graphene (NG)/SnO 2 hollow sphere hybrids were synthesized in this work. The chemical composition, crystal structure and morphology have been characterized by FT-IR spectra, XRD, Raman spectra, XPS, SEM and TEM in detail. Reflection loss (RL) values of NG/SnO 2 hollow sphere hybrids less than -10 dB and -20 dB are found in the wide f...

In this paper, we present an anisotropic metamaterial (AMM) composed of a sub-wavelength metal grating sandwiched with bi-layered double-arrow-shaped (DAS) structure array, which can achieve high-efficiency circular polarization (CP) conversion via giant asymmetric transmission (AT) in terahertz (THz) region. Numerical simulation results indicate t...

We present a simple design of a six-band terahertz metamaterial absorber (MMA). The unit-cell of the MMA consists of a metallic cross-cave-patch (CCP) structure and an InSb dielectric spacing layer stands on a ground-plane. The permittivity of the InSb dielectric layer can be adjusted efficiently by the variation of external temperature. The numeri...

A photo-excited and polarization insensitive broadband tunable terahertz metamaterial absorber (MMA) based on the photo-sensitive material of silicon (Si) is proposed. The unit-cell structure of this MMA is consisting of compact split-ring resonator structure filled with silicon, mediate medium layer and metal ground-plane. The working frequency an...

We present the design and numerical simulations of a broadband plasmonic light absorber (PLA) based on a tungsten meander-ring-resonator (MRR) structure in visible region. The proposed PLA is composed of a periodic MRR array and a continuous tungsten (W) film separated by a dielectric substrate. Simulation results indicate that the absorbance of ou...

We propose a novel heterostructure based on 2D photonic crystals as broadband selective absorbers/emitters for solar thermophotovoltaics. Alternating hafnium oxide (HfO2) and titanium oxide (TiO2) filled cylinder cavities with tetragonal lattices are embedded into antireflection-coated tungsten (W) film. The simulated results show that the designed...

Herein, a novel design concept of a surface graphical photonic crystal (SGPC) has been proposed as an effective strategy to achieve angle-insensitive visible-infrared compatible camouflage. The SGPC, designed as a quasi-periodic Ge/ZnS photonic crystal following an arithmetic sequence in the physical thickness for each period, possesses a functiona...

In this paper, a multi-functional polarization convertor for terahertz (THz) light composed of a bilayer wire-split-ring (WSR) structure chiral metamaterial (CMM) was proposed and investigated numerically. Simulation results indicate that when normal incident light is propagating along the – z axis direction through the proposed CMM structure, the...

In this paper, a plasmonic perfect absorber (PPA) based on a silicon nanorod resonator (SNRR) for visible light is proposed and investigated numerically. The proposed PPA is only a two-layer nanostructure consisting of a SNRR periodic array and metal substrate. The perfect absorption mainly originates from excitation of the localized surface plasmo...