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Numerical study of a wide-angle and polarization-insensitive ultrabroadband metamaterial absorber in visible and near-infrared region
摘要： An ultrabroadband metamaterial absorber structure based on a periodic array of metallic-dielectric multilayered conical frustums is numerically investigated and proposed. The metamaterial absorber indicated an absorptivity of higher than 90%, which covered the visible and near-infrared region at 480-1480 nm, and a relative absorption bandwidth of 102%. The high absorptivity can be maintained with large incident angles up to 60° under both transverse electric and transverse magnetic polarizations. Furthermore, the proposed absorber exhibits polarization insensitivity owing to its rotational symmetry structure. Compared with the previously reported ultrabroadband metamaterial absorbers, the design in this work indicates high practical feasibility in terms of compact structure for large bandwidth, wide incident angle and polarization insensitivity, thereby suggesting its promising application, for example, in solar cells and thermal emitters.
关键词： Metamaterial,Absorber,Visible,Ultrabroadband,Near-Infrared
更新于2025-09-23 15:23:52
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Design of a six-band terahertz metamaterial absorber for temperature sensing application
摘要： 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 numerical simulation results show that the MMA has six distinct absorption peaks from 0.4 THz to 2.2 THz, and the absorption peak frequencies can be tuned easily by changing the external temperature. The surface current distributions of the top layer and back layer of the unit-cell structure are studied to better understand the physical mechanism of the proposed MMA. The six-band strong absorption of the MMA is originated from the excitations of high-order magnetic resonance. In addition, the sensitivity S is investigated to explore temperature sensing performance of the device, and the value of S is 10.3 GHz/K, 8.1 GHz/K, 6.7 GHz/K, 6.4 GHz/K, 5.5 GHz/K and 5.4 GHz/K, respectively. The design of the MMA could find potential applications in temperature sensing or other optoelectronic related areas in terahertz region.
关键词： InSb,Terahertz metamaterial absorber,Temperature sensing,Six-band
更新于2025-09-23 15:22:29
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Perfect metamaterial absorber with high fractional bandwidth for solar energy harvesting
摘要： A new perfect metamaterial absorber (PMA) with high fractional bandwidth (FBW) is examined and verified for solar energy harvesting. Solar cells based on perfect metamaterial give a chance to increase the efficiency of the system by intensifying the solar electromagnetic wave that incident on the device. The designed structure is mostly offered in the visible frequency range so as to exploit the solar’s energy efficiently. Parametric investigations with regard to the measurements of the design structure are fulfilled to characterize the absorber. The finite-difference time-domain (FDTD) method-based CST simulator was used to keep the pattern parameters and absorbance analysis. The metamaterial shows almost 99.96% and 99.60% perfect absorption at 523.84 THz and 674.12 THz resonance frequencies. Moreover, absorption’s FBW is studied, and 39.22% FBW is found. The results confirm that the designed PMA can attain very high absorption peak at two modes such as transverse electric (TE) and transverse magnetic (TM) mode. Other than the numerical outcomes demonstrated that the suggested configuration was also polarization angle insensitive. In addition, the change of absorbance of the structure has provided a new kind of sensor applications in these frequency ranges. Therefore, the suggested metamaterial absorber offers perfect absorption for visible frequency ranges and can be used for renewable solar energy harvesting applications.
关键词： solar energy harvesting,polarization angle insensitive,perfect metamaterial absorber,visible frequency range,high fractional bandwidth
更新于2025-09-23 15:21:21
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[IEEE 2020 IEEE 33rd International Conference on Micro Electro Mechanical Systems (MEMS) - Vancouver, BC, Canada (2020.1.18-2020.1.22)] 2020 IEEE 33rd International Conference on Micro Electro Mechanical Systems (MEMS) - Monolithic Integration of Plasmonic Meta-Material Absorber with CMOS-MEMs Infrared Sensor for Responsivity Enhancement and Human Detection Application
摘要： This study integrates monolithically a metal-insulator-metal-based plasmonic metamaterial absorber (PMA) with a thermoelectric (TE) infrared (IR) sensor using standard TSMC CMOS platform. The proposed design extends the strip-via releasing hole structure in [1] to further integrate MIM absorber with TE IR sensor. Such design exhibits three merits: (1) the line width requirement of MIM absorber is achieved by CMOS process, (2) the absorption peaks of MIM absorbers can be modulated by pattern designs in the epsilon-near-pole region, and (3) the MIM absorbers can be designed to broaden the absorption spectrum of IR sensor. In application, the absorption spectrum of IR sensor is designed within 8-14μm in this study for human detection application. Measurement result demonstrates the integration of MIM absorber and IR sensor can achieve 21% improvement and the measured absorption spectrum matches with simulation.
关键词： CMOS-MEMS,human detection,thermoelectric infrared sensor,responsivity enhancement,plasmonic metamaterial absorber
更新于2025-09-23 15:21:01
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A Stretchable Metamaterial Absorber with Deformation Compensation Design at Microwave Frequencies
摘要： A stretchable microwave metamaterial absorber with specific pattern design is proposed and fabricated in this paper to improve the stability of microwave absorption for deformation. Compensation mechanism is revealed by the electrical current loop for resonance absorption excitation in equivalent circuit model. The proposed metamaterial absorber with slotted cross pattern is compared with the conventional cross pattern absorber. A stretchable silver conductive ink validates the silk screen printing of resistive patterns on flexible polydimethylsiloxane (PDMS) substrate and hence realizes the stretching experiments. In a 25% stretch, the resonant frequency of the compensated absorber shifts only 0.5% for TM polarization, comparing to the 8% shifting of the conventional structure.
关键词： Stretchable,compensation mechanism,metamaterial absorber,resistive patterns,equivalent circuit model
更新于2025-09-23 15:21:01
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A Broadband Tunable Terahertz Metamaterial Absorber Based on Single-Layer Complementary Gammadion-Shaped Graphene
摘要： 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 dynamically by the applied DC bias voltage, which enables us to electrically control the absorption performance of the proposed MMA flexibly. When Ef = 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 Ef from 0 eV to 0.8 eV, which is in agreement with the theoretical calculation by using the interference theory. Due to its simple structure and flexible tunability, the proposed MMA has potential application prospects in tunable filtering, modulators, sensing, and other multispectral devices.
关键词： graphene,surface plasmon polaritons,broadband tunable absorption,terahertz metamaterial absorber
更新于2025-09-23 15:19:57
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Ultra-narrowband dielectric metamaterial absorber for sensing based on cavity-coupled phase resonance
摘要： We propose an ultra-narrowband dielectric metamaterial absorber with dielectric-dielectric-metal (DDM) structure where a dielectric cavity layer is inserted between the top compound periodic dielectric microstructures and bottom metal substrate. The results show that this absorber has an ultra-narrowband absorption with a full width at half-maximum (FWHM) of 0.028 nm and quality factor larger than 50,000 in the near-infrared regime. The electric field distribution shows that the phase resonance excited in the microstructures slits is coupled with the cavity resonance occurring in the middle dielectric layer which can greatly narrow the absorption bandwidth. More importantly, the absorption bandwidth can be flexibly manipulated by adjusting the thickness of the dielectric cavity layer. Due to the ultra-narrow absorption bandwidths and electric field concentrated in the slits, we can get a huge figure of merit (FOM) of 6731 which is much larger than those of the reported absorbers in the near-infrared regime. In addition, the larger FOM of 20,366 can be attained with higher-order mode resonance in the dielectric cavity layer. The proposed metamaterials have the great potentials in sensing applications.
关键词： Absorption,Sensor,Metamaterial,Absorber
更新于2025-09-23 15:19:57
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A Tunable Terahertz Metamaterial Absorber Composed of Hourglass-Shaped Graphene Arrays
摘要： In this paper, we demonstrate a tunable periodic hourglass‐shaped graphene arrays absorber in the infrared (IR) and terahertz (THz) frequency bands. The effects of graphene geometric parameters, chemical potentials, periods, and incident angles on the pure absorption characteristics are studied by using the Finite Difference Time Domain (FDTD) method. In addition, this paper also analyzes the pure absorption characteristics of bilayer graphene arrays. The simulation results show that the maximum absorption reaches 38.2% for the monolayer graphene structure. Furthermore, comparing the bilayer graphene structure with the monolayer structure under the same conditions shows that the bilayer structure has a tunable dual‐band selective absorption effect and has a higher maximum absorption of 41.7%. Moreover, it was found that there are dual‐band tunable absorption peaks at 21.6 μm and 36.3 μm with the maximum absorption of 41.7% and 11%. The proposed structure is a convenient method which could be used in the design of graphene‐based optoelectronic devices, biosensors, and environmental monitors.
关键词： surface plasmon resonance,metamaterial absorber,graphene,finite difference time domain
更新于2025-09-23 15:19:57
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[IEEE 2018 18th Mediterranean Microwave Symposium (MMS) - Istanbul, Turkey (2018.10.31-2018.11.2)] 2018 18th Mediterranean Microwave Symposium (MMS) - Polarization Insensitive Metamaterial Absorber Using Sunflower Shaped Unit Cell
摘要： In this paper, a novel polarization insensitive metamaterial absorber using sunflower shaped unit cell is proposed. The performance of the proposed absorber was demonstrated with 3D full-wave EM solver under normal incidence for TE and TM polarization modes. Due to the symmetric geometry of the sunflower shaped unit cell, the proposed absorber provides a high level of absorptivity, about %90, for both TE and TM modes at 11.9 GHz. To enhance the absorptivity, we then created a hollow at the center of the proposed unit cell. The later device resonates at 11.7 GHz, and provides perfect absorption for both polarization modes. Our study reveals that employing hollow type symmetrical gaps provokes the interaction of EM wave and the metamaterial, and can lead to the perfect metamaterials for X-band absorber applications.
关键词： Metamaterial,absorber,X band,unit cell,polarization insensitive
更新于2025-09-19 17:15:36
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Ultra-narrow band perfect metamaterial absorber based on dielectric-metal periodic configuration
摘要： The ultra-narrow band perfect metamaterial absorber (PMA) based on dielectric-metal periodic configuration for near infrared spectral region is proposed. The PMA consists of a dielectric resonant structure and a metal substrate. Two design examples show that the proposed PMAs are able to exhibit nonpolarizing absorption peaks at normal and oblique incidences respectively. Moreover, the absorption spectra of the PMA for oblique incidence are insensitive to the incident angle under TE polarized light illumination. But this PMA exhibits a large spectral shift by rotating the angle of incidence under TM polarized light illumination. Then a PMA sample for oblique incidence is fabricated through thin-film deposition and electron beam lithography patterning. Finally, the reflection spectra of the fabricated PMA sample are measured. The absorption spectra obtained by subtracting the measured reflection spectra from incident spectra are consistent with the theory. Thus the novel characteristics of the ultra-narrow band PMA based on dielectric-metal periodic configuration are experimentally demonstrated.
关键词： Ultra-narrow band,Nonpolarizing absorption,Perfect metamaterial absorber,Tunable spectrum,Diffraction grating
更新于2025-09-19 17:15:36