Journal of Alloys and Compounds, volume 925, pages 166617

Dual-band tunable terahertz perfect absorber based on all-dielectric InSb resonator structure for sensing application

Publication type: Journal Article
Publication date: 2022-12-01
scimago Q1
wos Q1
SJR: 1.103
CiteScore: 11.1
Impact factor: 5.8
ISSN: 09258388, 18734669
Materials Chemistry
Metals and Alloys
Mechanical Engineering
Mechanics of Materials
Abstract
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 1.436 THz, respectively, which is consistent well with the fitting results of coupling mode theory (CMT). According to the simulated electric field and power loss density distributions, the perfect absorption results from the excitation of the first- and second-order plasmonic resonance mode. Further results show that the designed PA is polarization-insensitive due to the high geometric rotational symmetry, and wide-angle absorption can be achieved for transverse magnetic (TM) waves. The geometric parameters of the VSSR structure InSb and the external environment temperature can be changed to adjust the resonance absorption properties of the designed dual-band PA. The dual-band PA can be functional as a temperature sensor with a sensitivity of about 5.9 GHz/K and 6.4 GHz/K, respectively. Furthermore, the dual-band PA under T = 295 K also can be served as a refractive index sensor with a sensitivity of about 1.3 THz/RIU and 1.0 THz/RIU, respectively. Due to its excellent properties including simple design, easy fabrication, polarization-insensitive and perfect absorption, the proposed dual-band PA may find many potential applications in detecting, imaging, and sensing in the THz region. • Dual-band tunable perfect absorber (PA) based on InSb structure was proposed in THz region. • The absorbance of PA is up to 99.9% and 99.8% at 1.265 THz and 1.436 THz, respectively. • Perfect absorption due to the first- and second-order plasmonic resonance mode in the InSb structure. • The dual-band PA can be served as temperature sensor with sensitivity 5.9 GHz/K and 6.4 GHz/K, and refractive index (RI) sensor with a sensitivity 1.3 THz/RIU and 1.0 THz/RIU, respectively.
Found 61
By date By citations
Springer Nature
Multiband polarization insensitive and tunable terahertz metamaterial perfect absorber based on the heterogeneous structure of graphene
Norouzi-Razani A., Rezaei P.
Optical and Quantum Electronics scimago Q2 wos Q3 , 
2022-06-06,  citations by CoLab: 47 ,  Abstract  
In this paper, we present and investigate a multi-band metamaterial perfect absorber based on the heterogeneous structure of graphene with Cu and SiO2 substrates. The top layer of structure consists of one graphene disk at the center and four graphene solid triangle with semicircular cuts on them that surround the central disk. This heterogeneous structure causes us to achieve 99.5%, 99.7%, 94.71% and 97.06% perfect absorptions peaks at 4.24 THz, 5.89 THz, 9.66 THz and 10.62 THz, respectively. The absorption mechanism based on electric fields has been investigated. We can shift the wavelength of absorption peaks to our required wavelength by changing the Fermi level (µc) of graphene. Two absorption peaks of this absorber remain unchanged in different light incident angles. In addition, very important point about this structure is that it is not sensitive to polarization and this feature makes the proposed absorber very suitable for applications such as imaging, filtering, sensing and detecting applications.
Wiley
Optically Tunable Terahertz Metasurface Absorber
Zheng C., Li J., Liu L., Li J., Yue Z., Hao X., Zhang Y., Zang H., Yao J.
Annalen der Physik scimago Q2 wos Q2 , 
2022-04-03,  citations by CoLab: 27 ,  Abstract  
Tunable absorbers are promising for reconfigurable metasurface applications. Here a tunable terahertz (THz) perfect absorber is proposed which consists of high resistance silicon (undoped silicon) and can realize the switch between perfect reflection and perfect absorption (optical pumping, 1064 nm continuous wave). The proposed THz absorber exhibits perfect absorption around 0.74 THz and a 90% absorption bandwidth of 0.5 THz. Additionally, the working frequency range of the device can be easily designed by adjusting the side length and height of the square silicon pillars. Effective medium theory, mode analysis, and impedance matching theory are used to design and explain the proposed THz absorber. The experimental results agree well with the simulations. The proposed scheme allows for more flexible design of THz absorbers, and the device is easier to be fabricated. The proposed tunable THz absorber can find applications in THz sensing, modulator, and optic-electro switches.
Royal Society of Chemistry (RSC)
Thermal tuning of terahertz metamaterial absorber properties based on VO2
Zheng Z., Luo Y., Yang H., Yi Z., Zhang J., Song Q., Yang W., Liu C., Wu X., Wu P.
Physical Chemistry Chemical Physics scimago Q2 wos Q1 , 
2022-03-23,  citations by CoLab: 242 ,  Abstract  
We present a novel, structurally simple, multifunctional broadband absorber. It consists of a patterned vanadium dioxide film and a metal plate spaced by a dielectric layer. Temperature control allows flexible adjustment of the absorption intensity from 0 to 0.999. The modulation mechanism of the absorber stems from the thermogenic phase change properties of the vanadium dioxide material. The absorber achieves total reflection properties in the terahertz band when the vanadium dioxide is in the insulated state. When the vanadium dioxide is in its metallic state, the absorber achieves near-perfect absorption in the ultra-broadband range of 3.7 THz-9.7 THz. Impedance matching theory and the analysis of electric field are also used to illustrate the mechanism of operation. Compared to previous reports, our structure utilizes just a single cell structure (3 layers only), and it is easy to process and manufacture. The absorption rate and operating bandwidth of the absorber are also optimised. In addition, the absorber is not only insensitive to polarization, but also very tolerant to the angle of incidence. Such a design would have great potential in wide-ranging applications, including photochemical energy harvesting, stealth devices, thermal emitters, etc.
Royal Society of Chemistry (RSC)
Multi-mode surface plasmon resonance absorber based on dart-type single-layer graphene
Chen H., Chen Z., Yang H., Wen L., Yi Z., Zhou Z., Dai B., Zhang J., Wu X., Wu P.
RSC Advances scimago Q1 wos Q2 Open Access , 
2022-03-09,  citations by CoLab: 243 ,  PDF,  Abstract  
In this paper, a multi-mode surface plasmon resonance absorber based on dart-type single-layer graphene is proposed, which has the advantages of polarization independence, tunability, high sensitivity, high figure of merit, etc. The device consists of a top layer dart-like patterned single-layer graphene array, a thicker silicon dioxide spacer layer and a metal reflector layer, and has simple structural characteristics. The numerical results show that the device achieves the perfect polarization-independent absorption at the resonance wavelengths of λI = 3369.55 nm, λII = 3508.35 nm, λIII = 3689.09 nm and λIV = 4257.72 nm, with the absorption efficiencies of 99.78%, 99.40%, 99.04% and 99.91%, respectively. The absorption effect of the absorber can be effectively regulated and controlled by adjusting the numerical values such as the geometric parameters and the structural period p of the single-layer graphene array. In addition, by controlling the chemical potential and the relaxation time of the graphene layer, the resonant wavelength and the absorption efficiency of the mode can be dynamically tuned. And can keep high absorption in a wide incident angle range of 0° to 50°. At last, we exposed the structure to different environmental refractive indices, and obtained the corresponding maximum sensitivities in four resonance modes, which are SI = 635.75 nm RIU-1, SII = 695.13 nm RIU-1, SIII = 775.38 nm RIU-1 and SIV = 839.39 nm RIU-1. Maximum figure of merit are 54.03 RIU-1, 51.49 RIU-1, 43.56 RIU-1, and 52.14 RIU-1, respectively. Therefore, this study has provided a new inspiration for the design of the graphene-based tunable multi-band perfect metamaterial absorber, which can be applied to the fields such as photodetectors and chemical sensors.
Elsevier
An amplitude and frequency tunable terahertz absorber
Shen Q., Xiong H.
Results in Physics scimago Q2 wos Q1 Open Access , 
2022-03-01,  citations by CoLab: 43 ,  Abstract  
• The absorber can be controlled by Fermi energy level ( E F ) and temperature ( T ). • Coupled-mode theory (CMT), perturbation theory, and the electric field distribution at the resonance point are utilized to verify the authenticity of numerical results. A perfect terahertz (THz) metamaterial absorber (MMA) based on bulk Dirac semimetal (BDS) and strontium titanate (STO) is proposed and numerically analyzed. By integrating two new materials with adjustable dielectric constant in one structure, the performance of this design can be flexibly controlled. The simulation results show that as the Fermi energy ( E F ) of BDS varies from 10 meV to 70 meV, the absorption rate can be tuned from 89% to 100%, with the resonant frequency exhibits a tiny blue shift. Meanwhile, the center frequency can be tuned by varying the temperature of STO from 150 K to 300 K. In addition, the absorption reaches 1 at 0.69 THz when the temperature of STO and E F of BDS are set as 200 K and 30 meV, respectively. The coupled-mode theory (CMT) and perturbation theory are used to explore the reason of perfect absorption and frequency tunable mechanism, respectively. Further research and analysis prove that this designed absorber shows outstanding feature of angular insensitivity. Our work provides a potential guide for designing multifunctional THz devices, such as photodetectors, modulators, sensors, and so on.
Elsevier
Broadband polarization insensitive and tunable terahertz metamaterial perfect absorber based on the graphene disk and square ribbon
Norouzi-Razani A., Rezaei P.
Micro and Nanostructures scimago Q2 wos Q2 , 
2022-03-01,  citations by CoLab: 47 ,  Abstract  
Designing broadband absorbers with only one metamaterial layer operating in the terahertz band is a relatively difficult challenge. In this paper, we proposed and investigate a broadband metamaterial perfect absorber (MPA) based on the graphene disk and square ribbon. The conductive substrate of this structure is made of gold and the middle dielectric layer of this structure is made of Rogers RT5880LZ, which acts as a spacer layer between the gold and graphene layers. This structure, while having only one metamaterial layer, also has the advantage of easy implementation because the graphene embedded on the dielectric surface does not have a complex design. The simulation results show that the proposed absorber can provide absorption above 90% with a bandwidth of 2.173 ​THz (1.482–3.655 ​THz). The fractional bandwidth ratio of the proposed structure is 85% for absorption greater than 90%. The absorption mechanism of this structure based on electric fields has been investigated. Since the design of the proposed broadband MPA is symmetrical, this structure is not sensitive to polarization and has a good bearing angle in the range of 0–30°. The proposed structure is tunable because we can shift the absorption frequency by changing the Fermi level of graphene (μ c ). The proposed absorber with these properties is suitable and flexible for applications such as sensing, imaging, and spectroscopy. • The structure has the advantage of easy execution due to its single-layer metamaterial and simple design. • The bandwidth of the structure for absorption above 90% is equal to 2.173 ​THz (1.482–3.655 ​THz). • The structure is tunable without the need for structural changes. • The structure has behaviors such as insensitivity to polarization and high tolerance to the incident angle. • The structure is suitable for applications such as sensing, imaging and spectroscopy.
Royal Society of Chemistry (RSC)
A switchable terahertz device combining ultra-wideband absorption and ultra-wideband complete reflection
Zheng Z., Zheng Y., Luo Y., Yi Z., Zhang J., Liu Z., Yang W., Yu Y., Wu X., Wu P.
Physical Chemistry Chemical Physics scimago Q2 wos Q1 , 
2022-01-10,  citations by CoLab: 214 ,  Abstract  
Terahertz functional devices have been instrumental in the development of terahertz technology. Moreover, the advent of metamaterials has greatly contributed to the advancement of terahertz devices. However, most of today's metamaterials in the terahertz band exhibit poor performance and are mono-functional. This greatly limits the scalability and application potential of the devices. To achieve diversification and tunability of device functionality, we propose a combination of metamaterial structures and vanadium dioxide film. A metamaterial absorber based on the thermotropic phase change material VO2 has been designed. Flexible switching of absorption performance (complete reflection and ultra-broadband perfect absorption) can be achieved through temperature adjustment. Moreover, the perfectly absorbed bandwidth is a staggering 3.3 THz. The thermal tuning of spectral absorbance has a maximal range of 0.01 to 0.999. The shift in absorption properties is explained by the phase change process of vanadium oxide (MIT). The electric field intensity on the absorber surface at different temperatures was monitored and analysed as a way to correlate the VO2 film phase transition process. The impedance matching theory is applied to explain the high level of absorption generated by the absorber. Finally, the effects of the structural parameters on the performance of the absorber are analysed. This work will have many applications in the terahertz field and offers a wide range of ideas for the design of terahertz-enabled devices.
Optica Publishing Group
Simulation and lithographic fabrication of a triple band terahertz metamaterial absorber coated on flexible polyethylene terephthalate substrate
Abdulkarim Y.I., Xiao M., Awl H.N., Muhammadsharif F.F., Lang T., Saeed S.R., Alkurt F.Ö., Bakır M., Karaaslan M., Dong J.
Optical Materials Express scimago Q2 wos Q2 Open Access , 
2021-12-24,  citations by CoLab: 48 ,  PDF,  Abstract  
A triple band metamaterial absorber in the terahertz range, incorporating a three closed circle ring resonator, was designed and fabricated on flexible polyethylene terephthalate “PET” substrate. The proposed design was investigated theoretically and experimentally. Computer simulation technology “CST” was used to study the designed structure, while lithography technique was used to fabricate the absorber and terahertz time-domain spectroscopy was utilized to measure the reflectivity. Results showed the presence of three intensive peaks at the resonance frequencies of ‘0.43, 0.61, and 0.88 THz’, which correspond to the absorptivity of 98%, 91%, and 98%, respectively. The sensitivity of the three peaks was found to be ‘70.5, 133, and 149.5 GHz/RIU’, respectively. The parametric studies and field distributions were analysed. Furthermore, the proposed design exhibited polarization insensitivity for both transverse electric “TE” and transverse magnetic “TM” modes from 00 to 900. It was concluded that the proposed design can be specifically viable for some important applications such as ‘THz’ images, filtering, biological sensing, and optical communications.
Optica Publishing Group
Analyzing broadband tunable metamaterial absorbers by using the symmetry model
Xiong H., Yang Q., Huang Z., Peng W., Zhang H.
Optics Express scimago Q1 wos Q2 Open Access , 
2021-11-30,  citations by CoLab: 11 ,  PDF,  Abstract  
In this paper, a broadband tunable absorber based on bulk Dirac semimetal (BDS) in the far-infrared regime is studied. By optimizing the Femi energy and geometric size, the structure can achieve absorption levels greater than 90% in the 8.11-13.94 THz range, with a total thickness of 5.1 µm. Further, the bandwidth of this proposed absorber can be dynamically controlled by changing the Femi energy of the BDS instead of geometry. Meanwhile, the polarization and oblique incident angles in the TE and TM electromagnetic waves are also investigated. Finally, a new symmetry model is adopted to analyze the absorption mechanism, which is the innovation of this paper. This research result may provide potential applications for all types of optical photovoltaic devices and tunable biological chemistry sensors.
Optica Publishing Group
Wave-thermal effect of a temperature-tunable terahertz absorber
Xiong H., Ma X., Zhang H.
Optics Express scimago Q1 wos Q2 Open Access , 
2021-11-03,  citations by CoLab: 33 ,  PDF,  Abstract  
Heat-sensitive materials have great applications in sensor, detector, and tunable photoelectric devices. However, the wave-thermal effect of the heat-sensitive material is rarely been investigated in the THz range. Here, we propose the incorporation of heat-sensitive material (strontium titanate (STO)) within a THz absorber. The simulated results show that the absorptance and frequency can be dynamically controlled by the temperature of STO. Because the absorbed THz waves are finally converted into heat, then we research the theoretical mechanism of heat generation. Theoretical analysis shows that there are two reasons for the temperature rise: surface plasmon polariton (SPP) and ohmic loss of gold patch; Electromagnetic energy consumption inside the loss materials. To verify the theory, finally, we use COMSOL Multiphysics to research the nanosecond wave-thermal effect. The transient temperature of the wave-thermal effect is calculated quantitatively. The quantitative prediction of temperature variation can provide good guidance for thermal regulation and wave-thermally tunable THz devices.
Elsevier
Broadband terahertz absorber based on hybrid Dirac semimetal and water
Xiong H., Li D., Zhang H.
Optics and Laser Technology scimago Q1 wos Q2 , 
2021-11-01,  citations by CoLab: 55 ,  Abstract  
• The absorption bandwidth and intensity not only can be controlled by Fermi energy of BDS, but also can be tuned by temperature of water. • Tunable mechanism of the proposed dual-controlled absorber is to utilize the permittivity of water can be adjusted by temperature. • DS can be controlled by Fermi energy. • Field analyses are introduced to analyze and elucidate the physical origin of broadband absorption. A dual-tunable broadband metamaterial absorber based on bulk Dirac semimetal (BDS) and water is proposed in the terahertz (THz) region. Different from the traditional single controlled absorber, this proposed absorber can be adjusted by temperature and Fermi energy level. Simulation results indicate that the absorptance greater than 90% is achieved in the frequency range of 3.05 to 6.35 THz under normal incidence, when the temperature of the water and Fermi energy level of BDS are adjusted at 15 ℃ and 30 meV, respectively. Compared with the absorber without injected water or no BDS pattern, the bandwidth with absorptance over 90% has been significantly improved. Moreover, absorption bandwidth and intensity can be controlled independently or jointly by adjusting the temperature of the water or the Fermi energy of BDS instead of redesigning the devices. The mechanism of the proposed dual-controlled absorber is explained by utilizing the permittivity of water can be adjusted by different temperatures, and BDS can be controlled by employing the Fermi energy. Field analysis is introduced to investigate and elucidate the physical origin of broadband absorption. Based on the remarkable performance, our results may have potential applications in the thermal detectors and terahertz imaging areas.
Elsevier
Terahertz perfect absorber based on InSb metasurface for both temperature and refractive index sensing
Cheng Y., Li Z., Cheng Z.
Optical Materials scimago Q1 wos Q1 , 
2021-07-01,  citations by CoLab: 98 ,  Abstract  
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 Q-factor of about 53.24 under room temperature ( T = 295 K) can be obtained for this proposed PA. The perfect absorption is mainly contributed to the fundamental dipolar resonance inside the unit-cell structure. The resonance absorption properties of the PA can be adjusted by changing the geometric parameters of the structure. The proposed PA has a sensitivity of about 4.2 GHz/K since the electrical property of the InSb is highly dependent on the surrounding thermal radiation, which can be served as a temperature sensor. In addition, the PA also can be functioned as a RI sensor due to its higher Q-factor. As proofs of the RI sensing application, the sensitivity of the PA-based RI sensor about 1043.3 GHz/RIU at 295 K, and 920 GHz/RIU at 300 K can be obtained. Therefore, the narrow-band PA could be found promising applications on sensors, detectors, filters, and other optoelectronic devices in THz region. • Narrow-band tunable THz perfect absorber (PA) based on InSb metasurface was proposed. • The absorbance of PA is 99.9% at 1.757 THz and the Q-factor is about 53.24 when temperature 295 K. • Perfect absorption due to the fundamental dipolar resonance in the InSb metasurface. • The proposed PA can be served as both temperature and refractive index (RI) sensor.
Elsevier
A thermally stable and polarization insensitive square-shaped water metamaterial with ultra-broadband absorption
Abdulkarim Y.I., Awl H.N., Alkurt F.O., Muhammadsharif F.F., Saeed S.R., Karaaslan M., Bakır M., Luo H.
Journal of Materials Research and Technology scimago Q1 wos Q1 Open Access , 
2021-07-01,  citations by CoLab: 24 ,  Abstract  
In this paper, square-shaped water metamaterial is reported, which can be used as a perfect absorber for ultra-broadband absorption in the microwave frequency range. Computer Simulation Technology (CST) software was used to investigate the results numerically, while a 3D printing technology was used to fabricate the proposed design. The simulated and experimental results showed that the proposed structure achieved absorption of more than 90% in the frequency range from 10.4 to 30 GHz. Moreover, the proposed metamaterial-based system was able to show polarization insensitivity and to maintain a high absorption response in the temperature range from 0 to 100 °C, which reaveled a good thermal stability. The absorption mechanism was elaborated taking into consideration the power loss, electric and magnetic field distributions at three resonant frequencies of 12.1, 17.5 and 24.97 GHz. The performance of the proposed system was seen to outperform that of the reported works in literature. It is believed that the metamaterial structure can be a good candidate for the application of energy harvesting and stealth technology due to the high absorption, thermal stability, low cost and easy fabrication of the proposed design.
Elsevier
An ultrathin and dual band metamaterial perfect absorber based on ZnSe for the polarization-independent in terahertz range
Abdulkarim Y.I., Özkan Alkurt F., Awl H.N., Muhammadsharif F.F., Bakır M., Dalgac S., Karaaslan M., Luo H.
Results in Physics scimago Q2 wos Q1 Open Access , 
2021-07-01,  citations by CoLab: 49 ,  Abstract  
In this work, a new metamaterial design is proposed to yield an ultra-thin and dual band metamaterials perfect absorber (MPA) to be operated in the frequency range from 15 to 35 THz. The proposed structure is consisted of a copper resonator deposited on a very thin Zinc Selenide ZnSe (0.6 μm) substrate, where the backside of the structure is covered with a metal plate to block the transmission of electromagnetic waves. Computer Simulation Technology (CST) was used to design and investigate the proposed structure. The absorption response of the proposed structure was found to be high enough with absorptivity of 98.44 and 99.28 at 22.46 THz and 28.95 THz, respectively. Results showed that the absorber is insensitive to the incident angle of 0°–60° in both transverse electric (TE) and transverse magnetic (TM) modes, respectively. The MPA was seen to be highly independent on the angles of polarization of the incident waves. The working mechanism of the proposed design was revealed by multiple reflection interference theory and a good agreement was confirmed between the calculated and simulated results. The proposed design can be used for possible applications of stealth technology and imaging.
Elsevier
Optically switchable broadband metasurface absorber based on square ring shaped photoconductive silicon for terahertz waves
Cheng Y., Liu J., Chen F., Luo H., Li X.
Physics Letters, Section A: General, Atomic and Solid State Physics scimago Q2 wos Q2 , 
2021-06-01,  citations by CoLab: 94 ,  Abstract  
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 electric conductivity of the PSRS Si array can be controlled through the external optical pump beam. Through adjusting the electrical conductivity of the Si array, the structure can realize a switching absorption from 2.8% to 99.9%, and the relative bandwidth of the continuous absorption of 90% is tuned from 16.2% to 86.4%. Thus, the corresponding modulation depth of the proposed structure is up to 97.2%, and frequency tuning bandwidth of the continuous absorption of 90% is about 81.25%. The broadband stronger absorption of the structure mainly originates from the excitation of the fundamental dipolar mode. In addition, this design is polarization-independent and wide angles for both incident transverse electric (TE) and transverse magnetic (TM) waves. The Fabry-Perot interference theory is used to analyze the operation mechanism of the structure, and the theoretical results agrees well with simulations. Furthermore, the broadband absorption properties can be adjusted by varying the geometric parameters of the structure. Due to its excellent optically switchable response, the proposed structure may find potential applications in dynamic functional THz devices, such as modulators, switches, reflector and absorber.
Found 166
By date By citations
Elsevier
Super perfect polarization-insensitive graphene disk terahertz absorber for breast cancer detection using deep learning
Zamzam P., Rezaei P., Khatami S.A., Appasani B.
Optics and Laser Technology scimago Q1 wos Q2 , 
2025-05-01,  citations by CoLab: 4 , 
Elsevier
Machine Learning-Enhanced Ultrawideband Al-In₂Se₃-AlN Solar Absorber Investigation for Heating Water Systems Using Thin-Layer Graphene
Patel S.K., Han B.B., Alsalman O., Kumar O.P.
Renewable Energy scimago Q1 wos Q1 , 
2025-04-01,  citations by CoLab: 0 , 
Elsevier
Quad-functional narrowband-broadband electrical/thermal dual-controlled adjustable metasurface absorber
Ali M., Yao Y., Ali R., Ali L., Khan Z.U., Ali S., Ali J., Saif Z., Su W.
Optics Communications scimago Q2 wos Q2 , 
2025-04-01,  citations by CoLab: 2 , 
Elsevier
Convolutional neural network-assisted design and validation of terahertz metamaterial sensor
Chen S., Zhao C., Wang W., Yang S., Zhou C.
Materials and Design scimago Q1 wos Q1 Open Access , 
2025-03-23,  citations by CoLab: 0 , 
Optica Publishing Group
Adaptive THz Control Using Graphene-Embedded Temperature-Sensitive Material Structures
Ashraf N., Yaqoob M., Alkanhal M., Ghaffar A., Sohail Ahmad M., Khan Y.
Journal of the Optical Society of America B: Optical Physics scimago Q2 wos Q3 , 
2025-03-18,  citations by CoLab: 0 ,  Abstract  
Precise manipulation of terahertz (THz) waves is critical for applications in communication, imaging, and sensing. This study investigates the reflectance and transmittance properties of graphene-embedded structures composed of temperature-sensitive materials (TSMs) and temperature-insensitive materials (ATSMs). Four configurations—ATSM-TSM, TSM-TSM, ATSM-G-TSM, and TSM-G-TSM—are analyzed. The ATSM-TSM configuration achieves zero reflectance and nearly 100% transmittance from 0.5 to 6.5 THz, while the TSM-TSM provides tunable broadband reflectance and transmittance within 0.1–4 THz. Graphene integration in ATSM-G-TSM and TSM-G-TSM enhances tunability, enabling dual-channel resonance and broadband control across 0.5–6 THz. Temperature-induced impedance mismatch in indium antimonide (InSb) and graphene’s plasmonic effects provide precise control over resonance frequencies and transparency. These findings demonstrate the potential of graphene-embedded TSM and ATSM structures for advanced THz filters, modulators, and sensors, paving the way for innovative tunable photonic devices.
Elsevier
Annular Ti-Al2O3-Ti triple-layer stacked composite microstructure solar absorber
Xu Y., Wang B., Zhou J.
Applied Thermal Engineering scimago Q1 wos Q1 , 
2025-03-01,  citations by CoLab: 0 , 
Elsevier
Multifunctional VO₂-Liquid Crystal Hybrid Metamaterials for Dual-Controlled Terahertz Absorption
Liu H., Zhang H., Ma J., Li Y., Ji W., Fan Y., Tao Z.
Optics Communications scimago Q2 wos Q2 , 
2025-03-01,  citations by CoLab: 0 , 
SPIE-Intl Soc Optical Eng
Dual-band tunable terahertz absorber based on all-dielectric InSb metamaterials
Zhang H., Liu H., Ma J., Li Y., Zhang Y., Wang X., Tao Z., Fan Y.
2025-02-20,  citations by CoLab: 0 , 
SPIE-Intl Soc Optical Eng
Design of enhanced absorption structure for PbSe mid-wave infrared detector
xu Y., Chen C., Zhou H., Wei Y., Jiang Y., Li X., Xiong Y., Hao X., Ke Z., Wu Z.
2025-02-17,  citations by CoLab: 0 , 
Springer Nature
Design and Fabrication of a Multi-band Circuit Analog Absorber Based on Double-Layered Fractal Resonators
Wang Q., He L., Zuo C., Zeng W., Chen Z., Wu M., He Y., Xu H., Tang Y.
Journal of Electronic Materials scimago Q2 wos Q3 , 
2025-02-13,  citations by CoLab: 1 ,  Abstract  
A multi-frequency, high-performance, ultrathin composite absorber covering the S, C, X, and Ku bands in the operating frequency range is designed by using a double-layer fractal frequency-selective surface (FSS) pattern composite, whose unit structure consists of the FSS, an intermediate matching layer, and a grounded metal. The finite time domain difference algorithm is used to simulate the structure numerically. The simulated results show that the absorption rate is as high as 90% on average in the six frequency bands of 3.6 GHz, 4.6 GHz, 9.5 GHz, 11.34 GHz, 13.91 GHz, and 16.1 GHz under vertical incidence, which is in good agreement with the experimental results. Due to the symmetrical design of the structure, the absorber is polarization-insensitive. The position of the absorption peak can be effectively regulated according to the dimensions of the cross and square fractals in the cell structure. Moreover, absorption characteristics of the proposed absorber are verified using an equivalent circuit model, and the physical mechanism of electromagnetic wave energy attenuation is investigated by analyzing the surface current, electromagnetic field, and power loss density. The proposed circuit analog absorber could be applied in anti-electromagnetic interference and stealth technology.
Optica Publishing Group
Independently tunable dual-channel angle-sensitive narrowband perfect absorber
Yang Q., Zeng L., Li B.
Applied Optics scimago Q2 wos Q3 , 
2025-02-13,  citations by CoLab: 0 ,  Abstract  
In this correspondence, we introduce a versatile adjustable absorber featuring two distinct channels. Its primary composition includes strontium titanate (STO) and graphene. The refractive index of STO is influenced by temperature variations and the existence of the structural cavity, allowing for dynamic regulation of the absorption spectrum through external temperature changes and the angle of incident light. The developed device is capable of achieving dual-channel narrow-band perfect absorption at frequencies of 0.394 and 1.24 THz, demonstrating absorption rates of 99% and 98%, respectively. Importantly, we examined the Fermi level transition from 0 to 0.5 eV, revealing that the first resonance absorption peak can be adjusted within a range of 60% to 99%, accompanied by a redshift. This phenomenon is attributed to the local surface plasmon resonance induced by the graphene layer. The absorption characteristics of the second resonance remain relatively stable due to the peak formations within the Fabry–Perot cavity situated inside the STO layer. Given that the formant is influenced by temperature, it can be utilized as a temperature sensor. Furthermore, the absorptivity can be modified by altering the angle of the incident light. As a result of this angle dependence, optical switching can be achieved with a 22 dB ON/OFF ratio and a modulation depth close to 100%. Due to the symmetry of the absorption structure, the device remains unaffected by the polarization of the incoming light. The proposed tunable absorber has potential applications in electromagnetic absorption, optical switching, and various other domains.
Optica Publishing Group
Multipolar multifunction terahertz tunable metasurface
Xiao Y., Liao K.
Applied Optics scimago Q2 wos Q3 , 
2025-01-24,  citations by CoLab: 0 ,  Abstract  
A terahertz coded metasurface composed of VO2, polyimide, and Au is proposed. Based on line polarization multiplexing, seven functions in all are realized by designing the structure of the top VO2 resonator and the middle gold pattern. The simulation results show that when VO2 is metallic and the linearly polarized wave of f=1−2THz is vertically incident, the unit exhibits broadband absorption with an absorption rate (AR) greater than 84%. The AR in the range of 1.56–2 THz can reach more than 90%. When VO2 is insulated, the unit can achieve narrowband absorption at 1.57 THz, with an AR of nearly 100%. Meanwhile, the same coded metasurface can realize one of the five functions of beam deflection, vortex beam, deflected vortex beam, beam splitting, and superimposed vortex beam under x and y polarization modes. This work can provide certain reference for the design of multifunctional devices with metamaterial in the terahertz field.
IOP Publishing
Gallium nitride ultra-wideband terahertz absorber based on periodic pyramidal array
Qin M., Ji S., Zhao J., Li J.
Journal Physics D: Applied Physics scimago Q1 wos Q2 , 
2025-01-07,  citations by CoLab: 0 ,  Abstract  
Abstract Gallium nitride (GaN) has garnered significant attention due to its unique properties. Here, we present, for the first time, a polarization-independent ultra-wideband absorber in the terahertz band, consisting of a pyramidal GaN array and a GaN substrate. Numerical simulation results indicate that the designed absorber exhibits excellent absorption performance in the range of 0.39–1.98 THz, with a center frequency of 1.185 THz. The relative bandwidth ratio is 134.2%, and the absorption exceeds 90%. The equivalent circuit model further illustrates the ultra-wideband strong absorption characteristics of the proposed absorber. The simulated electromagnetic field distribution indicates that the perfect absorption of the designed absorber is attributed to the excitation of electromagnetic resonance. Additionally, due to the high structural symmetry, the absorber exhibits polarization-independent properties and maintains high absorption performance at large incidence angles. In the future, the proposed absorber will have a wide range of applications in optical applications, including detector devices, light detection equipment and solar energy collection systems.
IOP Publishing
Design and Analysis of a Quad-band Perfect Metamaterial Absorber with Enhanced Sensing Capabilities in the Terahertz Regime
Khalil M.A., Hin Yong W., Islam M.S., Hoque A., Lo Y., Alenezi A., Soliman M.S., Islam M.T.
Physica Scripta scimago Q2 wos Q2 , 
2025-01-02,  citations by CoLab: 0 ,  Abstract  
Abstract This study presents the design and analysis of a Quad-band perfect metamaterial absorber (PMMA) with five distinct absorption peaks, achieving absorption rates consistently above 96%. The absorption performance is thoroughly examined by varying the structural parameters to elucidate the mechanisms underlying the multi-band absorption. Additionally, we investigate the sensing capabilities of the absorber by analyzing its response to changes in the refractive index and thickness of the analyte. Sensitivity and figure of Merit (FOM) are utilized to evaluate the sensing performance. The sensor demonstrates refractive index and thickness sensitivities of 1.5 THz RIU−1 and 0.5 THz RIU−1, respectively, with corresponding FOMs of 97.424 and 91.633. These results surpass those of prior terahertz regime designs, highlighting the superior sensing capabilities of the proposed absorber. The proposed design is promising for sensing, filtering, and stealth technology applications.
Elsevier
Tunable terahertz meta-resonator with switchable single- and dual-resonance characteristic
Li B., Zeng Q., Lin Y.
Materials Today Communications scimago Q2 wos Q2 , 
2024-12-01,  citations by CoLab: 0 , 

Top-30

Journals

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IEEE Sensors Journal
IEEE Sensors Journal, 9, 5.45%
Plasmonics
Plasmonics, 8, 4.85%
International Journal of Thermal Sciences
International Journal of Thermal Sciences, 8, 4.85%
Optics Communications
Optics Communications, 6, 3.64%
Physical Chemistry Chemical Physics
Physical Chemistry Chemical Physics, 6, 3.64%
Optics and Laser Technology
Optics and Laser Technology, 5, 3.03%
Diamond and Related Materials
Diamond and Related Materials, 5, 3.03%
Optik
Optik, 5, 3.03%
Photonics
Photonics, 4, 2.42%
Physica Scripta
Physica Scripta, 4, 2.42%
Applied Physics A: Materials Science and Processing
Applied Physics A: Materials Science and Processing, 4, 2.42%
Nanomaterials
Nanomaterials, 3, 1.82%
Journal Physics D: Applied Physics
Journal Physics D: Applied Physics, 3, 1.82%
Advanced Theory and Simulations
Advanced Theory and Simulations, 3, 1.82%
Nanoscale
Nanoscale, 3, 1.82%
Journal of the Optical Society of America B: Optical Physics
Journal of the Optical Society of America B: Optical Physics, 3, 1.82%
Optical and Quantum Electronics
Optical and Quantum Electronics, 3, 1.82%
Materials Today Communications
Materials Today Communications, 3, 1.82%
Journal of Electronic Materials
Journal of Electronic Materials, 3, 1.82%
Results in Physics
Results in Physics, 3, 1.82%
IEEE Photonics Journal
IEEE Photonics Journal, 3, 1.82%
Advanced Photonics Research
Advanced Photonics Research, 3, 1.82%
IEEE Photonics Technology Letters
IEEE Photonics Technology Letters, 3, 1.82%
Surfaces and Interfaces
Surfaces and Interfaces, 3, 1.82%
Physica E: Low-Dimensional Systems and Nanostructures
Physica E: Low-Dimensional Systems and Nanostructures, 2, 1.21%
Optical Materials Express
Optical Materials Express, 2, 1.21%
Coatings
Coatings, 2, 1.21%
Materials Research Bulletin
Materials Research Bulletin, 2, 1.21%
Advanced Functional Materials
Advanced Functional Materials, 2, 1.21%
Microwave and Optical Technology Letters
Microwave and Optical Technology Letters, 2, 1.21%
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Publishers

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Elsevier
Elsevier, 57, 34.55%
Springer Nature
Springer Nature, 22, 13.33%
Institute of Electrical and Electronics Engineers (IEEE)
Institute of Electrical and Electronics Engineers (IEEE), 21, 12.73%
MDPI
MDPI, 15, 9.09%
Wiley
Wiley, 13, 7.88%
Royal Society of Chemistry (RSC)
Royal Society of Chemistry (RSC), 10, 6.06%
IOP Publishing
IOP Publishing, 7, 4.24%
Optica Publishing Group
Optica Publishing Group, 7, 4.24%
Taylor & Francis
Taylor & Francis, 2, 1.21%
Institution of Engineering and Technology (IET)
Institution of Engineering and Technology (IET), 2, 1.21%
SPIE-Intl Soc Optical Eng
SPIE-Intl Soc Optical Eng, 2, 1.21%
Optical Society of India
Optical Society of India, 1, 0.61%
Cambridge University Press
Cambridge University Press, 1, 0.61%
AIP Publishing
AIP Publishing, 1, 0.61%
Japan Society of Applied Physics
Japan Society of Applied Physics, 1, 0.61%
World Scientific
World Scientific, 1, 0.61%
Walter de Gruyter
Walter de Gruyter, 1, 0.61%
SAGE
SAGE, 1, 0.61%
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