通讯机构：
[Yang, Helin] C;Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Hubei, Peoples R China.
关键词：
metamaterials;coupled oscillator model;low-loss;electromagnetically induced transparency;refractive index sensing
摘要：
A low-loss and high transmission electromagnetically induced transparency like (EIT-like) structure is experimentally and numerically demonstrated in this paper. The proposed planar structure based on EIT-like metamaterial consists of two separate split-ring resonators, and its resulting transmission level can maximally reach 0.89 with significant suppression of radiation loss. According to the effective medium theory, the imaginary parts of the effective permittivity and permeability of the metamaterial are used as the evidence of low-loss. In the analysis, the simulated surface current, magnetic field distribution and coupled oscillator model reveal the principle of high transmittance EIT-effect. Furthermore, the peak of transparency frequency is highly sensitive to the variation of refractive index in the background medium. The sensor based on the proposed EIT structure can achieve a sensitivity of 1.69 GHz/RIU (refractive index unit) and a figure of merit of 11.66. Such metamaterials have potential perspectives in sensing and chiral slow light devices.
作者机构：
[Yu, Shengqing; Huang, Xiaojun; Hui, Weihua; Yu, SQ] Kashgar Univ, Coll Phys & Elect Engn, Kashgar 844000, Peoples R China.;[Yang, Helin; Huang, Xiaojun] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Hubei, Peoples R China.
会议名称：
Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)
会议时间：
JUL 31-AUG 04, 2017
会议地点：
Singapore, SINGAPORE
会议主办单位：
[Huang, Xiaojun;Yu, Shengqing;Hui, Weihua] Kashgar Univ, Coll Phys & Elect Engn, Kashgar 844000, Peoples R China.^[Huang, Xiaojun;Yang, Helin] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Hubei, Peoples R China.
关键词：
dual-function;polarization;metamaterial
摘要：
A bi-layer metamaterial based on split ring resonators is presented for simultaneously controlling polarization of reflection and refraction waves. It is demonstrated that x-polarized incident wave was vertically reflected or transmitted through the designed metamaterial with polarization conversion ratio of more than 90% at the resonant frequencies.
期刊：
Journal of Applied Physics,2017年122(4):043102 ISSN：0021-8979
通讯作者：
Yang, Helin
作者机构：
[Yang, Helin; Chen, Jiao; Huang, Xiaojun] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Hubei, 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, Hubei, Peoples R China.
摘要：
Metasurfaces have opened an effective way to handle the polarization states of electromagnetic waves due to their intrinsic parameters which could be flexibly tailored. In this paper, we present a simple anisotropic metasurface to realize the polarization manipulation of circularly polarized waves with high conversion efficiency in a wide frequency range. The presented simple metasurface can keep the handedness of the reflected waves for circularly polarized incident waves. Both the simulated and experimental results show that the bandwidth of the polarization conversion ratio more than 90% is 7.16 GHz (8.16-15.32 GHz), and the polarization extinction ratio is larger than 15 dB in this frequency range. Because of the simple design and easy fabrication, the designed metasurface can be an excellent candidate for reflection circular polarization conversion. Published by AIP Publishing.
期刊：
PROCEEDINGS OF THE 2016 11TH INTERNATIONAL SYMPOSIUM ON ANTENNAS, PROPAGATION AND EM THEORY (ISAPE),2016年:431-434
通讯作者：
Chen, Jiao
作者机构：
[Chen, Jiao] Huanggang Normal Univ, Coll Math & Phys, Huanggang 438000, Peoples R China.;[Yang, Helin; Hu, Sen; Chen, Jiao; Huang, Xiaojun] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
通讯机构：
[Chen, Jiao] H;[Chen, Jiao] C;Huanggang Normal Univ, Coll Math & Phys, Huanggang 438000, Peoples R China.;Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
会议名称：
11th International Symposium on Antennas, Propagation and EM Theory (ISAPE)
会议时间：
OCT 18-21, 2016
会议地点：
Guilin, PEOPLES R CHINA
会议主办单位：
[Chen, Jiao] Huanggang Normal Univ, Coll Math & Phys, Huanggang 438000, Peoples R China.^[Chen, Jiao;Yang, Helin;Hu, Sen;Huang, Xiaojun] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
关键词：
metamaterial;absorber;curved
摘要：
We investigate the absorption properties of a curved metamaterial absorber (CMA) in microwave. The simulation results show that the CMA could be used with better performance than the traditional planar metamaterial absorber (PMA) with the same physical parameters in exciting more perfect absorption peaks. Moreover, the absorption properties are related to the polarization direction of electromagnetic (EM) waves, which make it possible for the CMA to be used as frequency selective absorber. In addition, the effects of structure parameters of the unit cell on absorption properties are analyzed in detail.
摘要：
We present a detailed study on the artificial negative index refraction behavior of the composite metamaterial consisting of high-permittivity dielectric rings. The rings array in cubic lattice arrangement can exhibit an negative magnetism when excited into magnetic dipole resonance. Full-wave simulations show that the bulk metamaterial with this structure can exhibit a negative refraction behavior. It is shown that artificial magnetic response can originate from differently structured dielectric elements, similarly to the conventional metamaterial constituents based on metal resonance structures.
作者机构：
[Tian, Ying; Yang, Helin; Huang, Xiaojun; Guo, Linyan; Yao, Wang] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, 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：
microstrip antennas;reflector antenna feeds
摘要：
We present a novel parabolic antenna by employing reflection gradient metasurface which is composed of a series of circle patches on a grounded dielectric substrate. Similar to the traditional parabolic antenna, the proposed antenna take the metasurface as a “parabolic reflector” and a patch antenna was placed at the focal point of the metasurface as a feed source, then the quasi-spherical wave emitted by the source is reflected and transformed to plane wave with high efficiency. Due to the focus effect of reflection, the beam width of the antenna has been decreased from 85.9° to 13° and the gain has been increased from 6.5 dB to 20.8 dB. Simulation and measurement results of both near and far-field plots demonstrate good focusing properties of the proposed parabolic antenna.
摘要：
In this letter, we propose the simulation, design and fabrication of the microstip quad-band bandstop filter (QBBSF) with Square Spiral Resonators (SSR). The basic cell of the structure consists of a folded stepped impedance microstrip transmission line. The center frequency of the filter is 1.12 GHz, 3.61 GHz, 6.20 GHz and 9.81GHz with the bandwidth of 1.13 GHz, 1.25 GHz, 1.12 GHz and 3.01GHz, respectively. The experimental results are closely matched with the simulated results.
作者机构：
[Lin, Hai; Yang, Helin; Yang, Dong] Cent China Normal Univ, Coll Phys Sci & Technol, 152 Luoyu Rd, Wuhan 430079, Peoples R China.;[Han, Song] Nanyang Technol Univ, Sch Phys & Math Sci, Div Phys & Appl Phys, Singapore 637371, Singapore.;[Liu, Yangjie] Queen Mary Univ London, Sch EECS, Antennas Grp, 356 Engn Bldg, London E1 4NS, England.
通讯机构：
[Lin, Hai] C;Cent China Normal Univ, Coll Phys Sci & Technol, 152 Luoyu Rd, Wuhan 430079, Peoples R China.
关键词：
Destructive interference;Electromagnetically induced transparency;Fano resonance;Optical activity;Slow light;Split ring resonators
摘要：
In this paper, we theoretically and experimentally demonstrate a three-dimensional metamaterial that can motivate electromagnetic induced transparency (EIT) by using circular polarized wave as stimulations. The unit cell consists of a pair of metallic strips printed on both sides of the printed circuit board (PCB), where a conductive cylinder junction is used to connect the metal strips by drilling a hole inside the substrate. When a right circularly polarized wave is incident, destructive interference is excited between meta-atoms of the 3D structure, the transmission spectrum demonstrates a sharp transparency window. A coupled oscillator model and an electrical equivalent circuit model are applied to quantitatively and qualitatively analyze the coupling mechanism in the EIT-like metamaterial. Analysis in detail shows the EIT window's amplitude and frequency are modulated by changing the degree of symmetry breaking. The proposed metamaterial may achieve potential applications in developing chiral slow light devices. metasurfaces with simultaneous control of phase and amplitude, " Adv. Mater.
作者机构：
[Han, Song; Lin, Hai; Yang, Helin] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.;[Cong, Longqing; Singh, Ranjan] Nanyang Technol Univ, Sch Phys & Math Sci, Div Phys & Appl Phys, Singapore 637371, Singapore.;[Cong, Longqing; Singh, Ranjan] Nanyang Technol Univ, Sch Phys & Math Sci, Ctr Disrupt Photon Technol, Singapore 637371, Singapore.;[Xiao, Boxun] Yangtze Univ, Engn Geophys Res Ctr, Jingzhou 434023, Peoples R China.
通讯机构：
[Yang, Helin] C;Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
摘要：
Metamaterials have recently enabled coupling induced transparency due to interference effects in coupled subwavelength resonators. In this work, we present a three dimensional (3-D) metamaterial design with six-fold rotational symmetry that shows electromagnetically induced transparency with a strong polarization dependence to the incident electromagnetic wave due to the ultra-sharp resonance line width as a result of interaction between the constituent meta-atoms. However, when the six-fold rotationally symmetric unit cell design was re-arranged into a fourfold rotational symmetry, we observed the excitation of a polarization insensitive dual-band transparency. Thus, the 3-D split-ring resonators allow new schemes to observe single and multi-band classical analogues of electromagnetically induced transparencies that has huge potential applications in slowing down light, sensing modalities, and filtering functionalities either in the passive mode or the active mode where such effects could be tuned by integrating materials with dynamic properties.
摘要：
The transmission characteristics of a planar metamaterial, composed of two finite metal strips (with different length) and one double split-ring resonator (DSRR) have been numerically and experimentally investigated in this paper. By varying the length of the two strips slightly, this structure can exhibit single-band and dual-band electromagnetically induced transparency (EIT)-like spectral response in microwave region. The coupled oscillator model is employed to theoretically and quantitatively study the EIT profiles. Our work provides a way to obtain multiple EIT-like effects, and it may achieve potential applications in a variety of fields including filters, sensing, and some other microwave devices.
期刊：
Progress In Electromagnetics Research C,2016年61:115-125 ISSN：1937-8718
通讯作者：
Yang, Helin(emyang@mail.ccnu.edu.cn)
作者机构：
[Yao, Wang; Huang, Xiaojun; Yang, Helin; Wu, Song] College of Physical Science and Technology, Central China Normal University, Wuhan, China;[Huang, Xiaojun] College of Physics and Electrical Engineering, Kashgar University, Kashgar, China;[Xiao, Boxun; Yi, Yuanyuan] Engineering Geophysical Research Center, Yangtze University, Jingzhou, China
通讯机构：
College of Physical Science and Technology, Central China Normal University, Wuhan, China
