Enhancing sensing capacity of terahertz metamaterial absorbers with a surface-relief design

作     者：WEI WANG FENGPING YAN SIYU TAN HAISU LI XUEMEI DU LUNA ZHANG ZHUOYA BAI DAN CHENG HONG ZHOU YAFEI HOU 

作者机构：Key Laboratory of All Optical Network&Advanced Telecommunication of EMCInstitute of Lightwave TechnologyBeijing Jiaotong UniversityBeijing 100044China Zhengzhou Xinda Institute of Advanced TechnologyZhengzhou 450001China Department of ElectronicsInformation and Communication EngineeringOsaka Institute of Technology5-16-1 OmiyaAsahi-kuOsaka535-8585Japan Graduate School of Natural Science and TechnologyOkayama University1-1-1 TsushimanakaKita WardOkayama Prefecture700-8530Japan 

出 版 物：《Photonics Research》 (光子学研究（英文版）)

年 卷 期：2020年第8卷第4期

页      面：519-527页

核心收录：

学科分类：0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：National Natural Science Foundation of China(61620106014,61827818,61805010) Natural Science Foundation of Beijing Municipality(4192048) 

主　　题：Enhancing sensing capacity terahertz metamaterial absorbers a surface-relief design 

摘      要：Metamaterial absorbers(MAs)serve as important electromagnetic wave-absorbing devices that have captured the attention of researchers for a long *** as sensitive detectors to determine perturbations in an ambient environment is another significant subsidiary ***,we theoretically propose an optimized fabrication method to implement terahertz MAs with fewer steps and also evaluate both absorption and sensing performances of such MAs realized by the new *** findings demonstrate that such MAs can basically maintain the original absorption features perfectly,including near-complete absorption at resonance as well as strong robustness to wide incident ***,the full width at half-maximum and quality factor of the absorption resonances attenuate less than 26%and 8%with this new method,remaining in the ranges of^0.03–0.04 THz and^20–27 for two selected example *** significantly,sensing capacities of this type of MA,in terms of maximum detection range(enhancing at least 9%),observable spectral modulation(increasing at least 6.3%),and refractive index sensitivity,are improved to a large extent because of more intense coupling between resonant field and matter in the case of surface-relief *** stronger coupling results from exposing more spots of the resonantly high field to direct contact with an approaching analyte,which is illustrated by field profiles of the MAs at resonance in this ***,other desirable absorber features are also explored with such MAs,like functioning as building blocks to configure multiband MAs and strong robustness against fabrication *** new-style terahertz MAs shown in the paper,acting as good examples,not only prove that terahertz MAs can be fabricated by the proposed time-and cost-saving route in contrast to the traditional MA fabrication process,but also can serve as novel platforms to explore other intriguing terahertz photonic effects,such as the field enhancement e