关键词：
Metamaterials;Electromagnetically induced transparency (EIT);Refractive index sensing
摘要：
In this work, we report numerical research concerning a planar electromagnetically induced transparency (EIT) terahertz metamaterial capable of exhibiting refractive index sensing with high sensitivity. The unit cell of the proposed EIT metamaterial is consisted by metal cut wires with staggered H-shaped arrangement, and can display a sharply narrow transmission transparency peak at 2.653 THz with high quality-factor (Q-factor) valued 48.3. Through analysis of the extracted surface current distributions on metallic structures, it is confirmed that the EIT-like resonance results from the destructive interference of the electric quadrupole excited by the strong radiation of electric dipole. Furthermore, the EIT-like effect shows highly sensitive response to the refractive index of the covered layer. When it covered by 3 mu m-thickness analyte layer, the EIT metamaterial can yield a sensitivity of 0.2695 THz/refractive index unit (RIU) and a figure of merit (FOM) of 5.39. Meanwhile, it is also found that the sensitivity S is inversely proportional to the dielectric constant of the substrate material, and effective sensing capability maintains when the coverage thickness within 15 mu m. The proposed EIT metamaterial design provides great potential application for refractive index sensing performance.
摘要：
We demonstrate a classical analogue of electromagnetically induced transparency (EIT) metamaterial that consisting of anomalous split resonance ring and cross-shaped wire with simulations and experiments. The transmission spectrum is tunable with the incident angles varies from 0 degrees to 60 degrees in different modes. Under normal incident wave, the metamaterial leads to polarization insensitive EIT-like effect. The distributions of surface current at peaks and dips of transmission have been analyzed. Furthermore, the group index presents maximum at the transparency peak, which verifies the slow light effect. The proposed metamaterial could provide an avenue for various applications, such as refractive index sensor and microwave switch.
摘要：
A tunable terahertz quintuple-band metamaterial graphene absorber is presented in this paper. The designed absorber consists of single-layered graphene and a gold bottom plane separated by a dielectric layer. The simulation results show that the absorber has high absorption in five frequency bands of 0.93 THz, 1.72 THz, 2.39 THz, 3.05 THz and 3.72 THz with the absorption of 99.9%, 99.7%, 96.4%, 94.7% and 92.9%, respectively. Beyond that, the polarization sensitivity of the absorber is not obvious, and the incident range is large under both transverse-electric and transverse-magnetic waves. By changing the Fermi energy of graphene from 0 eV to 1.0 eV, the absorption can be flexibly changed from 20% to 100%, which opens up the possibility of graphene-based tunable devices.
摘要：
We present the design of a new type of irregular metamaterial structure that can achieve ultra-wideband absorption. The structure is created using 3D-printing to create a shell and contains multiple layers of water. The structure can achieve absorption levels greater than 0.9 in the 6.8–21.0 GHz range, with a relative bandwidth of 101.93%. The absorber also works in a wide range of incidence angles with different modes and is polarization insensitive. Measurement results obtained from a microwave experiment coincide well with the simulation results. The proposed metamaterial could be broadly applied in various civilian and military products in the future.
期刊：
Journal of Electromagnetic Waves and Applications,2018年32(13):1664-1674 ISSN：0920-5071
通讯作者：
Huang, Xiaojun;Yang, Helin
作者机构：
[Rao, Fang; Yu, Zetai; Yang, Helin; Huang, Xiaojun; Hu, Sen] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan, Hubei, Peoples R China.;[Huang, Xiaojun] Kashgar Univ, Coll Phys & Elect Engn, Kashgar, Peoples R China.;[Jin, Yan] Wuhan Engn Sci & Technol Inst, Wuhan, Hubei, Peoples R China.
通讯机构：
[Huang, XJ; Yang, HL] C;Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan, Hubei, Peoples R China.
关键词：
Rotation sensor;angular detecting;complementary single split-ring resonator (CSSRR);metamaterials
摘要：
In this paper, a new rotation sensor based on a complementary single split-ring resonator (CSSRR) coupled to a circularly shaped microstrip line is designed, simulated and verified by experiment. Rotating the upper resonator, the measurement results reveal the relationship of the rotated angles and the transmission characteristics. Compared to the previously published rotation sensors, the sensor proposed benefits from a well immunity to ambient conditions and nearly same resonance frequency responses at the relatively symmetrical angles. It even can get a high sensitivity around 100 MHz per 10° with a wide dynamic range of 0°–90°. The configured device is quite compacted with respect to the operational wavelength and will have tremendous potential applications in the micro-electromechanical systems technology.
作者机构：
[胡森; 刘丹] Department of Physics and Mechanical & Electrical Engineering, Hubei University of Education, Wuhan;430205, China;[杨河林] College of Physical Science and Technology, Central China Normal University, Wuhan;430079, China;[胡森; 刘丹] 430205, China
通讯机构：
[Liu, D.] D;Department of Physics and Mechanical & Electrical Engineering, Hubei University of Education, Wuhan, China
摘要：
A compact planar construction composed of asymmetric split ring resonators was designed with a low-loss, high Q-factor resonance transparency at microwave frequency. The singularity property of the proposed metamaterial owing to the enhanced toroidal dipole T is demonstrated via numerical and experimental methods. The transmission peak can reach up to 0.91 and the loss is perfectly repressed, which can be testified by radiated power, H-field distributions, and the imaginary parts of effective permittivity and permeability. The designed planar metamaterial may have numerous potential applications at microwave, terahertz, and optical frequency, e.g., for ultrasensitive sensing, slow-light devices, lasing spacers, even invisible information transfer.
摘要：
A novel zigzag metamaterial (ZMM) that is completely different from the planar metamaterial (PMM) with the same unit cell, was designed, simulated and verified in the microwave frequency regime. Due to the properties of the impinging, the TE wave and TM wave are almost totally reflected (TE-metal-like) and totally transmitted (TM-dielectric-like) from the ZMM, and the ZMM is able to adjust the power ratio of the reflection to transmission from 5.24 to 14.52 GHz with the relative bandwidth equivalent to 93.93%. Besides, it also can transform the circularly polarized incident wave into a linearly polarized wave. The characteristics of high efficiency, ultra-broadband and angular stability will facilitate the ZMM in practical applications in communication and polarization control device. (c) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
期刊：
2018 12TH INTERNATIONAL SYMPOSIUM ON ANTENNAS, PROPAGATION AND ELECTROMAGNETIC THEORY (ISAPE),2018年:1-3
通讯作者：
Gong, Sha
作者机构：
[Chen, Jiao; Gong, Sha] Huanggang Normal Univ, Coll Phys & Telecommun, Huanggang, Peoples R China.;[Yang, Helin; Xiang, Tianyu; Chen, Jiao] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan, Hubei, Peoples R China.;[Wang, Qifeng] Wuhan Donghu Univ, Sch Elect & Informat Engn, Wuhan, Hubei, Peoples R China.
通讯机构：
[Gong, Sha] H;Huanggang Normal Univ, Coll Phys & Telecommun, Huanggang, Peoples R China.
会议名称：
The 12th International Symposium Antennas, Propagation, and EM Theory(ISAPE 2018)?(第十二届天线、传播与电磁理论国际学术会议)
会议时间：
2018-12-03
会议地点：
杭州
会议主办单位：
[Chen, Jiao;Gong, Sha] Huanggang Normal Univ, Coll Phys & Telecommun, Huanggang, Peoples R China.^[Chen, Jiao;Yang, Helin;Xiang, Tianyu] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan, Hubei, Peoples R China.^[Wang, Qifeng] Wuhan Donghu Univ, Sch Elect & Informat Engn, Wuhan, Hubei, Peoples R China.
会议论文集名称：
The 12th International Symposium Antennas, Propagation, and EM Theory(ISAPE 2018)?(第十二届天线、传播与电磁理论国际学术会议)论文集
关键词：
metamaterial;absorber;curved
摘要：
We numerically investigate the absorption property of a type of curved metamaterial absorber (CMA) in the microwave regime. Simulation results demonstrate that the CMA can perform absorption peaks at four resonant frequencies correspond to the fundamental, the second order, the third order and the forth order resonance frequencies respectively. This simple absorber is desirable for potential applications in improving absorbance performances.
作者机构：
[Li, Tianji; Yang, Helin] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan, Hubei, Peoples R China.
会议名称：
The 12th International Symposium Antennas, Propagation, and EM Theory(ISAPE 2018)?(第十二届天线、传播与电磁理论国际学术会议)
会议时间：
2018-12-03
会议地点：
杭州
会议主办单位：
[Li, Tianji;Yang, Helin] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan, Hubei, Peoples R China.
会议论文集名称：
The 12th International Symposium Antennas, Propagation, and EM Theory(ISAPE 2018)?(第十二届天线、传播与电磁理论国际学术会议)论文集
关键词：
metamaterial;dihedral corner;absorber
摘要：
The absorption properties of two different kinds of metamaterial structures which loaded over the dihedral corners are investigated under the incident microwaves of both TM and TE polarizations. Simulation results show that the dihedral corner metamaterial absorber (DCMA) can excite more absorption peaks than traditional planar metamaterial absorber (PMA) which have the same parameters of the unit cells. The DCMA is found to be polarization sensitive so it might be used as frequency selective absorber. Two different opening angles of the DCMA with these two structures are also discussed in this paper.
期刊：
2018 12TH INTERNATIONAL SYMPOSIUM ON ANTENNAS, PROPAGATION AND ELECTROMAGNETIC THEORY (ISAPE),2018年:1-3
通讯作者：
Yang, Helin
作者机构：
[Wang, Chengwen; Yu, Zetai; Yang, Helin; Xiang, Tianyu] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan, Hubei, Peoples R China.
通讯机构：
[Yang, Helin] C;Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan, Hubei, Peoples R China.
会议名称：
The 12th International Symposium Antennas, Propagation, and EM Theory(ISAPE 2018)?(第十二届天线、传播与电磁理论国际学术会议)
会议时间：
2018-12-03
会议地点：
杭州
会议主办单位：
[Wang, Chengwen;Yu, Zetai;Xiang, Tianyu;Yang, Helin] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan, Hubei, Peoples R China.
会议论文集名称：
The 12th International Symposium Antennas, Propagation, and EM Theory(ISAPE 2018)?(第十二届天线、传播与电磁理论国际学术会议)论文集
关键词：
metamaterial;high-gain
摘要：
We proposed a patch antenna with a circular ring structure loaded at the source of antenna radiation to increase the gain. Expanding the ground to suppress the backward wave of the antenna. Compared with conventional antennas, the gain of the designed antenna is 11.6 dBi, which is increased by 5 dBi, and improved with 75.7%. The metamaterial antenna shows good impedance match in a wideband form 8.47 GHz to 9.37 GHz. This paper provides a method to improve the gain of the micro-strip patch antenna and the method can effectively improve the gain of the antenna without increasing the profile. Experiment ware carried out to verify the simulation results.
期刊：
Sensors And Actuators A-Physical,2018年280:222-227 ISSN：0924-4247
通讯作者：
Yang, Helin
作者机构：
[Wang, Peng; Rao, Fang; Yang, Helin; Shen, Zhaoyang; Wu, Jiong; Huang, Xiaojun; Chen, Xiaoyu] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Hubei, Peoples R China.
通讯机构：
[Yang, Helin] C;Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Hubei, Peoples R China.
关键词：
Metamaterial;Microstrip;Sensor;Permittivity
摘要：
In this paper, based on the microstrip metamaterial composed of two coupled square rings, a novel liquid permittivity sensor is designed and fabricated. The sensor takes advantage of the coupling between two square rings connected by an interdigital capacitor. It realizes a relatively high sensitivity, and the bandwidth is less than 100 MHz at a working frequency of 900 MHz. The resonance frequency shifts from 810 MHz to 689.5 MHz when the real part of the sample's relative permittivity shifts from 1 to 78. The experimental results are in good agreement with simulated results. The designed sensor with compact dimensions and operating frequency paves the way for application to the Internet of Things. (C) 2018 Elsevier B.V. All rights reserved.
期刊：
Journal of Physics D: Applied Physics,2017年50(20):205002 ISSN：0022-3727
通讯作者：
Yang, Helin
作者机构：
[Zhang, Guoping; Yu, Zetai; Yang, Helin; Hu, Sen; Chen, Jiao; Huang, Xiaojun] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.;[Chen, Jiao] Huanggang Normal Univ, Coll Math & Phys, Huanggang 438000, Peoples R China.;[Huang, Xiaojun] Kashgar Univ, Coll Phys & Elect Engn, Kashgar 844000, Peoples R China.
通讯机构：
[Yang, Helin] C;Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
关键词：
metamaterial;rough surface;birefringent
摘要：
In this paper, we propose and fabricate a kind of zigzag birefringent reflective metamaterial, the surface of which is a 1D rough surface. It can realize both multiple absorption and broadband polarization conversion at different frequency ranges of microwave. This metamaterial is made of a ring-shaped metal piece that is deposited on one side of a piece of grounded zigzag dielectric substrate. The absorptivities are 99.4% and 97.3% at 3.32 and 6.87 GHz respectively, and the polarization conversion ratio is more than 90% from 8.43 to 11.55 GHz, when the incident wave illuminates the sample with different polarization angles. A bifunctional device based on this metamaterial can act as either an absorber or a polarizer. This work is of significance to study the electromagnetic properties of rough surface metamaterials and provides an encouraging example in metamaterial design for combining different functions into one device.
通讯机构：
[Yang, Helin] C;Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
摘要：
In this paper, a classical analogue of electromagnetically induced transparency (EIT) metamaterial is numerically and experimentally demonstrated. The unit cell of our proposed structure is composed of two identical and orthogonal double-end fork (DEF) metallic resonators. Under the excitation of the normally incident waves, each of the two DEFs exhibits different frequency of electric dipole response, which leads to the ultra-broadband and polarization-independent EIT-like effect. The resonant feature of the EIT-like effect has been qualitatively analyzed from the surface current distributions and quantitatively by the “two-oscillator” coupling model. In addition, the large group index is extracted to verify the slow light property within the transmission window. The EIT metamaterial structure with the above-mentioned characteristics may have potential applications in some areas, such as sensing, slow light, and filtering devices.
