2015 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)最新文献

{"title":"Efficient ADE-FDTD method for modelling graphene-based structures","authors":"Xiang-hua Wang, Yang Guo, Jun Hu, W. Yin","doi":"10.1109/IMWS-AMP.2015.7324900","DOIUrl":"https://doi.org/10.1109/IMWS-AMP.2015.7324900","url":null,"abstract":"A simple and efficient auxiliary-difference-equation finite-difference time-domain (ADE-FDTD) method for modelling graphene-based structures is presented in this paper. By considering the graphene sheet as a polarization current source characterized by an auxiliary equation (AE), the proposed method can be easily adopted to simulate graphene-based structures biased by electrostatic or magnetostatic field, respectively. The accuracy of proposed method is verified in comparison with the analytical results.","PeriodicalId":6625,"journal":{"name":"2015 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)","volume":"1 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2015-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88962196","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis of graphene and other 2D material: The past and future of chemical vapor deposition","authors":"S. Pei, Q. Yu, K. P. Huang, S. Xing, S. Chang, R. Ebrahim, F. Mansurov","doi":"10.1109/IMWS-AMP.2015.7324942","DOIUrl":"https://doi.org/10.1109/IMWS-AMP.2015.7324942","url":null,"abstract":"Over the past seven years, chemical vapor deposition has emerged as the preferred technique for the synthesis of graphene films on metal as well as other substrates. Commercial cell phones with a graphene touch screen have been introduced and roll-to-roll production tools have been demonstrated. The deposition temperature is also reduced from >1000°C to ~400°C with a plasma-enhanced process. For device applications, a seeded growth of single-crystal graphene at predetermined location technique has been developed to avoid the detrimental effects of the grain boundaries. The application of chemical vapor deposition and seeded growth to transition metal dichalcogenides is now under investigation.","PeriodicalId":6625,"journal":{"name":"2015 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)","volume":"89 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2015-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86019172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Magnetically switchable graphene coupler and application to a magnetic probe","authors":"N. Chamanara, C. Caloz","doi":"10.1109/IMWS-AMP.2015.7324899","DOIUrl":"https://doi.org/10.1109/IMWS-AMP.2015.7324899","url":null,"abstract":"A magnetically switchable graphene based coupler is proposed and analyzed. The proposed coupler is composed of chemically or electrically p- and n-doped graphene strips with coupled plasmonic edge modes. Based on this coupler, a plasmonic device with application as a magnetic sensor is proposed.","PeriodicalId":6625,"journal":{"name":"2015 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)","volume":"03 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2015-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86520449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Manipulating electromagnetic local density of states by graphene plasmonics","authors":"Yongpin P. Chen, W. Sha, L. J. Jiang, Jun Hu","doi":"10.1109/IMWS-AMP.2015.7325037","DOIUrl":"https://doi.org/10.1109/IMWS-AMP.2015.7325037","url":null,"abstract":"Electromagnetic local density of states (ELDOS) counts the number of electromagnetic modes at a spatial point where a particle (atom, molecule, and quantum dot) spontaneously emits electromagnetic waves. ELDOS can be interpreted as a density of vacuum fluctuations of electromagnetic fields. Moreover, ELDOS is essential to control spontaneous decay rate (SDR) of particles; and thus plays a critical role in modern optical and quantum devices. Having a great degree of freedom to tune permittivity, graphene is an emerging building block to manipulate the ELDOS. In this work, we study SDR of a particle near a metallic split-ring resonator, which is embedded in a multilayered substrate incorporating a graphene layer. Analyzing ELDOS in such a complex multilayered system is not only computationally challenging but also highly important to practical devices. First, dispersion relations of graphene plasmonics and metallic plasmonics are comparatively studied. From our investigations, graphene offers several flexible tuning routes to control SDR, which highly depends on the chemical potential of graphene sheet and the position and polarization of particle. Then, considering graphene plasmonics is excited at infrared regime, we carefully design a metallic split-ring resonating around the same frequency range. Consequently, this design allows a mutual interaction between the graphene sheet and split-ring. To reduce the computational burden, boundary element method in conjugation with a multilayered medium Green's function is adopted. The multilayered medium Green's function automatically includes the information of the ultrathin graphene. Therefore, only the split-ring scatterer is meshed. Blue-shifted and splitting resonance peaks are theoretically observed, which suggests a strong mode coupling between the graphene and split-ring. Furthermore, the mode coupling has a switch on-off feature via electrostatically doping the graphene sheet. This work is fundamentally important to dynamically tune ELDOS and SDR in complex devices.","PeriodicalId":6625,"journal":{"name":"2015 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)","volume":"11 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2015-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86634315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Graphene-loaded reconfigurable CPW interdigital capacitors","authors":"T. Zhou, Xi-Wang Dai, Zhi-Qun Cheng, Lingling Sun","doi":"10.1109/IMWS-AMP.2015.7325039","DOIUrl":"https://doi.org/10.1109/IMWS-AMP.2015.7325039","url":null,"abstract":"Graphene is a monolayer of carbon atoms which exhibits attractive electromagnetic properties amenable to millemeter wave and terahertz applications. Graphene-loaded CPW interdigital capacitors with reconfigurable responses will be studied in this paper. The graphene film is used as an overlay of the conventional metal interdigital capacitor for broadband impedance matching. The proposed capacitors will be able to provide reconfigurable performance by exploiting the tuning property of graphene film. The effect of varying the surface impedance of the graphene film is parametrically examined to ultra broadband impedance bandwidth. The capacitor values can be tuned, the losses are minimized by confining the graphene film to a small area outside the interdigital capacitor. The tuning capability is one of the important features of graphene based capacitors.","PeriodicalId":6625,"journal":{"name":"2015 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)","volume":"38 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2015-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83162436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Subwavelength prestressed microcantilevers based metamaterials for efficient manipulation of terahertz waves","authors":"Prakash Pitchappa, C. Ho, Chengkuo Lee","doi":"10.1109/IMWS-AMP.2015.7324981","DOIUrl":"https://doi.org/10.1109/IMWS-AMP.2015.7324981","url":null,"abstract":"We report an array of prestressed MEMS cantilever as active metamaterial for dynamic manipulation of terahertz waves. The electrostatically actuated microcantilevers integrated into split ring resonator and electrical split ring resonator unit cell, further enables active tuning of magnetic and electrical resonance, respectively. The actuation method of these bimaterial cantilevers is expanded using electrothermal and fluid flow methods. The simple MEMS microcantilevers is highly versatile with attractive electro-optic response and forms a technology platform for numerous terahertz applications in the future.","PeriodicalId":6625,"journal":{"name":"2015 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)","volume":"1 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2015-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82978005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Status and challenges of inkjet printed RF and THz structures","authors":"A. Traille, M. Tentzeris","doi":"10.1109/IMWS-AMP.2015.7324985","DOIUrl":"https://doi.org/10.1109/IMWS-AMP.2015.7324985","url":null,"abstract":"Inkjet printing is a low-cost, additive process that has enabled various disruptive technologies that combine new materials with novel multidisciplinary operation concepts. Beyond prototyping, their inherent scalability could make them good candidate for commercial/mass production applications such as large area structural monitoring, distributed sensing and IoT applications. This overview explores the reliability and the great potential of these novel technologies when applied to high performance RF and THz devices of the future.","PeriodicalId":6625,"journal":{"name":"2015 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)","volume":"6 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2015-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82484879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A wideband slot antenna for moblie phone applications","authors":"Weihua Zong, Xiangyang Wei","doi":"10.1109/APCAP.2016.7843269","DOIUrl":"https://doi.org/10.1109/APCAP.2016.7843269","url":null,"abstract":"A wideband impedance matching technique is presented on slot antenna for mobile handset applications at lower frequency band. The antenna is printed on a 60*115 mm2 FR-4 substrate with 0.8 mm thickness. Two rectangular slots are etched on the ground with open ends at opposite edges. One of the two is called the main slot with size of 5 mm*50 mm, the other one is called the additional slot with size of 40 mm*1 mm. The main slot is fed by a 50 Ω microstrip connected with a folded strip surrounding around the boundary of the main slot inside the main slot region. The strip with folded shape can induce the current flowing around the main slot from the close end to the open end on the ground, which results in the increase of the current distribution path and the decrease of the frequency of the first resonant mode. The additional slot is etched on the top portion of the ground above the main slot to excite more current distributing around the main slot region. With the technique, two resonant modes are excited at the lower frequency band, and a wide frequency bandwidth of 0.82~1.18 GHz is obtained.","PeriodicalId":6625,"journal":{"name":"2015 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)","volume":"48 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2015-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82833409","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Passive wireless gas sensors based on the LTCC technique","authors":"Mingsheng Ma, Zhifu Liu, Wei Shan, Yongxiang Li, K. Kalantar-zadeh, W. Wlodarski","doi":"10.1109/IMWS-AMP.2015.7325052","DOIUrl":"https://doi.org/10.1109/IMWS-AMP.2015.7325052","url":null,"abstract":"Many of the existing gas sensors cannot offer long-term continuous performance, rendering them selected ineffective for environmental and point-of-care monitoring tasks. The problem may arise from the limitation in accessible power supplies for their operation and signal communications. As a solution, a wireless passive gas sensor based on low temperature co-fired ceramic (LTCC) technology is presented in this work. The sensor consists of a planar inductor-interdigital capacitor resonant antenna circuit, covered with gas sensitive coatings. The antenna together with this pair of interdigital electrodes was fabricated using the LTCC process. Gas sensitive films were made of two dimensional tin disulfide (SnS2) nanostructures, which were deposited on the interdigital electrodes by drop-casting method. The gas sensing performance was investigated by monitoring the impedance phase angle changes of the antenna in response to different gas types and concentrations.","PeriodicalId":6625,"journal":{"name":"2015 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)","volume":"62 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2015-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82956798","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ultrathin metasurface based on phase discontinuity with maximal cross-polarization efficiency","authors":"Xumin Ding, Lei Zhang, Kuang Zhang, Qun Wu, C. Qiu","doi":"10.1109/IMWS-AMP.2015.7324987","DOIUrl":"https://doi.org/10.1109/IMWS-AMP.2015.7324987","url":null,"abstract":"An ultrathin flat metasurface experimentally realizing bi-functional microwave manipulation has been demonstrated to be able to approach the theoretical limit of cross-polarization (cross-pol) conversion efficiency of the transmission. With the excitation of a localized waveguide mode, an abrupt helicity-dependent phase change is introduced to the transmission and can be engineered by assembling the spatial orientation of each Pancharatnam-Berry phase element. By realizing a constant phase gradient, an anomalous refraction is unanimously demonstrated under circular polarized incident wave. Besides, due to the helicity-dependent phase modification, we also demonstrate an ultra-thin metalens with bi-functionality. By controlling the handedness of the incident wave, converging and diverging functions are interchangeable with the same flat lens. The proposed metalens has only one single layer as thin as 0.001λ, which massively reduces the thickness of the microwave lens along the wave propagation direction. With the great improvements in efficiency and thickness reduction, our design provides a promising approach to miniaturize, planarize and integrate multiple microwave components.","PeriodicalId":6625,"journal":{"name":"2015 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)","volume":"65 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2015-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89245037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}