Pub Date : 2016-09-01DOI: 10.1109/METAMATERIALS.2016.7746404
M. Tymchenko, A. Alú
We explore the design and realization of a topological Floquet insulator in the form of a graphene-like honeycomb network of wye resonators, in order to achieve non-reciprocal transport with zero backward reflection over a continuous frequency range. The topological insulator here consists of two domains, with different topological orders induced by a periodic spatio-temporal modulation of the resonance frequency in each branch of suitably arranged wye resonators, creating a form of local `spinning'. The modulation in opposite directions breaks time-reversal symmetry in the lattice and produces a topologically protected edge state with a gapless dispersion crossing the bulk bandgap. The topologically protected edge states possess unique properties, such as one-way guiding, small group velocity dispersion, absence of backscattering, and immunity to structural disorder. Our analysis allows unveiling their peculiar propagation and confinement properties, and their inherent robustness to defects and loss.
{"title":"Circuit-based magnetless floquet topological insulator","authors":"M. Tymchenko, A. Alú","doi":"10.1109/METAMATERIALS.2016.7746404","DOIUrl":"https://doi.org/10.1109/METAMATERIALS.2016.7746404","url":null,"abstract":"We explore the design and realization of a topological Floquet insulator in the form of a graphene-like honeycomb network of wye resonators, in order to achieve non-reciprocal transport with zero backward reflection over a continuous frequency range. The topological insulator here consists of two domains, with different topological orders induced by a periodic spatio-temporal modulation of the resonance frequency in each branch of suitably arranged wye resonators, creating a form of local `spinning'. The modulation in opposite directions breaks time-reversal symmetry in the lattice and produces a topologically protected edge state with a gapless dispersion crossing the bulk bandgap. The topologically protected edge states possess unique properties, such as one-way guiding, small group velocity dispersion, absence of backscattering, and immunity to structural disorder. Our analysis allows unveiling their peculiar propagation and confinement properties, and their inherent robustness to defects and loss.","PeriodicalId":6587,"journal":{"name":"2016 10th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS)","volume":"83 1","pages":"373-375"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74946383","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}
Pub Date : 2016-09-01DOI: 10.1109/METAMATERIALS.2016.7746398
Y. Aurégan, V. Pagneux
We show both theoretically and experimentally that an acoustical wave in an airflow duct going through a pair of diaphragms, one with amplification and another with an equivalent amount of attenuation, displays all the features of a parity-time (PT) symmetric system. Using a scattering matrix formalism, we show the novel features which reflect the PT-symmetry of the scattering acoustical system. We show experimentally the existence of a transition between PT-symmetric scattering eigenstates, which are norm preserving, and symmetry-broken pairs of eigenstates exhibiting net amplification and loss.
{"title":"PT symmetric scattering using passive acoustic with flow","authors":"Y. Aurégan, V. Pagneux","doi":"10.1109/METAMATERIALS.2016.7746398","DOIUrl":"https://doi.org/10.1109/METAMATERIALS.2016.7746398","url":null,"abstract":"We show both theoretically and experimentally that an acoustical wave in an airflow duct going through a pair of diaphragms, one with amplification and another with an equivalent amount of attenuation, displays all the features of a parity-time (PT) symmetric system. Using a scattering matrix formalism, we show the novel features which reflect the PT-symmetry of the scattering acoustical system. We show experimentally the existence of a transition between PT-symmetric scattering eigenstates, which are norm preserving, and symmetry-broken pairs of eigenstates exhibiting net amplification and loss.","PeriodicalId":6587,"journal":{"name":"2016 10th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS)","volume":"303 1","pages":"34-36"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77493419","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}
Pub Date : 2016-09-01DOI: 10.1109/METAMATERIALS.2016.7746504
B. Orazbayev, M. Navarro‐Cía, M. Beruete
We present here the design, fabrication and numerical as well as experimental results of a low-profile hybrid Wood zone plate fishnet metamaterial lens working at f = 99 GHz. The fishnet metamaterial with effective refractive index close to zero (n = 0.51) acts as an anti-reflecting layer as well as a beam shaper, increasing the overall efficiency while maintaining low profile, low cost and ease of manufacturing. The measurements are in good agreement with simulation results and demonstrate a focal length FL = 22.8 mm (7.5 λ0). In a lens antenna configuration a gain of 16.6 dB was measured at the operation frequency. This lens has a low-cost and compact design, and may find applications in integrated lens antenna systems.
{"title":"W-band hybrid wood zone plate fishnet metalens","authors":"B. Orazbayev, M. Navarro‐Cía, M. Beruete","doi":"10.1109/METAMATERIALS.2016.7746504","DOIUrl":"https://doi.org/10.1109/METAMATERIALS.2016.7746504","url":null,"abstract":"We present here the design, fabrication and numerical as well as experimental results of a low-profile hybrid Wood zone plate fishnet metamaterial lens working at f = 99 GHz. The fishnet metamaterial with effective refractive index close to zero (n = 0.51) acts as an anti-reflecting layer as well as a beam shaper, increasing the overall efficiency while maintaining low profile, low cost and ease of manufacturing. The measurements are in good agreement with simulation results and demonstrate a focal length FL = 22.8 mm (7.5 λ0). In a lens antenna configuration a gain of 16.6 dB was measured at the operation frequency. This lens has a low-cost and compact design, and may find applications in integrated lens antenna systems.","PeriodicalId":6587,"journal":{"name":"2016 10th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS)","volume":"23 1","pages":"247-249"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78863588","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}
Pub Date : 2016-09-01DOI: 10.1109/METAMATERIALS.2016.7746509
M. Kuzuoglu, O. Ozgun
The purpose of this study is to combine the transformation electromagnetics approach and the inverse algorithms for solving microwave imaging problems, especially in the context of imaging the shapes of complex objects. A suitable transformation medium is placed into the domain of interest by using the concepts of the transformation electromagnetics, and hence, expensive cost function evaluations can be performed by the finite element method with reduced computational load. Numerical examples are demonstrated to measure the performance of the proposed approach.
{"title":"A microwave imaging method based on transformation electromagnetics","authors":"M. Kuzuoglu, O. Ozgun","doi":"10.1109/METAMATERIALS.2016.7746509","DOIUrl":"https://doi.org/10.1109/METAMATERIALS.2016.7746509","url":null,"abstract":"The purpose of this study is to combine the transformation electromagnetics approach and the inverse algorithms for solving microwave imaging problems, especially in the context of imaging the shapes of complex objects. A suitable transformation medium is placed into the domain of interest by using the concepts of the transformation electromagnetics, and hence, expensive cost function evaluations can be performed by the finite element method with reduced computational load. Numerical examples are demonstrated to measure the performance of the proposed approach.","PeriodicalId":6587,"journal":{"name":"2016 10th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS)","volume":"33 1","pages":"262-264"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89432799","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}
Pub Date : 2016-09-01DOI: 10.1109/METAMATERIALS.2016.7746463
Z. Ereš, S. Hrabar
This paper presents an update on recently introduced low-cost CVD reactor for graphene synthesis in metamaterial research. Apart from previously reported synthesis of single-layer graphene, it has been shown possible to produce large area multi-layer graphene, as well. Raman spectroscopy revealed high quality and good repeatability of synthesized samples. Synthesized multi-layer graphene may find application in absorbers and non-linear metasurfaces that apply recently demonstrated phenomena such as four-wave mixing and phase conjugation.
{"title":"Low-cost multi-layer graphene for linear/non-linear metasurface applications","authors":"Z. Ereš, S. Hrabar","doi":"10.1109/METAMATERIALS.2016.7746463","DOIUrl":"https://doi.org/10.1109/METAMATERIALS.2016.7746463","url":null,"abstract":"This paper presents an update on recently introduced low-cost CVD reactor for graphene synthesis in metamaterial research. Apart from previously reported synthesis of single-layer graphene, it has been shown possible to produce large area multi-layer graphene, as well. Raman spectroscopy revealed high quality and good repeatability of synthesized samples. Synthesized multi-layer graphene may find application in absorbers and non-linear metasurfaces that apply recently demonstrated phenomena such as four-wave mixing and phase conjugation.","PeriodicalId":6587,"journal":{"name":"2016 10th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS)","volume":"10 1","pages":"136-138"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83503809","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}
Pub Date : 2016-09-01DOI: 10.1109/METAMATERIALS.2016.7746484
A. Kuznetsov
Resonant dielectric nanostructures has recently emerged as a new direction in nanophotonics, which may solve the major problems of plasmonics related to high losses, low magnetic response and CMOS incompatibility. In this talk I will review the recent progress in this rapidly developing field and demonstrate recent results from our team showing application of resonant dielectric nanostructures to design of highly efficient nanoantennas and metasurfaces.
{"title":"Metasurfaces and nanoantenna devices based on resonant dielectric nanostructures","authors":"A. Kuznetsov","doi":"10.1109/METAMATERIALS.2016.7746484","DOIUrl":"https://doi.org/10.1109/METAMATERIALS.2016.7746484","url":null,"abstract":"Resonant dielectric nanostructures has recently emerged as a new direction in nanophotonics, which may solve the major problems of plasmonics related to high losses, low magnetic response and CMOS incompatibility. In this talk I will review the recent progress in this rapidly developing field and demonstrate recent results from our team showing application of resonant dielectric nanostructures to design of highly efficient nanoantennas and metasurfaces.","PeriodicalId":6587,"journal":{"name":"2016 10th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS)","volume":"1 1","pages":"193-195"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73616754","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}
Pub Date : 2016-09-01DOI: 10.1109/METAMATERIALS.2016.7746452
A. Espinosa-Soria, A. Griol, Alejandro Martínez
A gold nanostrip acting as a plasmonic nanoantenna is embedded into a gap created in a silicon waveguide to ensure maximum interaction between the guided field and the nanoantenna. We study numerically this system and demonstrate experimentally at telecom wavelengths that contrast beyond 10 dB can be achieved in transmission, opening a route for the efficient use of nanoantennas in silicon photonics chips.
{"title":"Embedding a plasmonic nanoantenna into a silicon waveguide gap: Simulations and experimental demonstration","authors":"A. Espinosa-Soria, A. Griol, Alejandro Martínez","doi":"10.1109/METAMATERIALS.2016.7746452","DOIUrl":"https://doi.org/10.1109/METAMATERIALS.2016.7746452","url":null,"abstract":"A gold nanostrip acting as a plasmonic nanoantenna is embedded into a gap created in a silicon waveguide to ensure maximum interaction between the guided field and the nanoantenna. We study numerically this system and demonstrate experimentally at telecom wavelengths that contrast beyond 10 dB can be achieved in transmission, opening a route for the efficient use of nanoantennas in silicon photonics chips.","PeriodicalId":6587,"journal":{"name":"2016 10th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS)","volume":"103 1","pages":"106-108"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73712999","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}
Pub Date : 2016-09-01DOI: 10.1109/METAMATERIALS.2016.7746391
O. Shramkova, K. Makris, G. Tsironis
The optical properties of one-dimensional non-Hermitian system with dispersion are examined. The possibility of PT-symmetry realization by changing the parameters of the dispersive media with gain and loss is considered.
研究了具有色散的一维非厄米系统的光学性质。考虑了随增益和损耗改变色散介质参数实现pt对称的可能性。
{"title":"Phase transitions in dispersive non-Hermitian optical systems","authors":"O. Shramkova, K. Makris, G. Tsironis","doi":"10.1109/METAMATERIALS.2016.7746391","DOIUrl":"https://doi.org/10.1109/METAMATERIALS.2016.7746391","url":null,"abstract":"The optical properties of one-dimensional non-Hermitian system with dispersion are examined. The possibility of PT-symmetry realization by changing the parameters of the dispersive media with gain and loss is considered.","PeriodicalId":6587,"journal":{"name":"2016 10th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS)","volume":"78 1","pages":"337-339"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77405777","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}
Pub Date : 2016-09-01DOI: 10.1109/METAMATERIALS.2016.7746499
A. Monti, A. Toscano, F. Bilotti
In this contribution, we describe the optical properties of bi-dimensional arrays of ellipsoidal nanoparticles and propose some potential applications. First, we analyze a 2D metasurface model able to rigorously characterize the optical behavior of these structures in terms of equivalent surface impedance. Then, we comment some of their possible applications ranging from the design of optical scattering cancellation devices up to the realization of transparent screens. Full-wave simulations are provided to confirm the effectiveness of the analytical model.
{"title":"Low-loss and lossy optical metasurfaces based on ellipsoidal nanoparticles","authors":"A. Monti, A. Toscano, F. Bilotti","doi":"10.1109/METAMATERIALS.2016.7746499","DOIUrl":"https://doi.org/10.1109/METAMATERIALS.2016.7746499","url":null,"abstract":"In this contribution, we describe the optical properties of bi-dimensional arrays of ellipsoidal nanoparticles and propose some potential applications. First, we analyze a 2D metasurface model able to rigorously characterize the optical behavior of these structures in terms of equivalent surface impedance. Then, we comment some of their possible applications ranging from the design of optical scattering cancellation devices up to the realization of transparent screens. Full-wave simulations are provided to confirm the effectiveness of the analytical model.","PeriodicalId":6587,"journal":{"name":"2016 10th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS)","volume":"29 5 Suppl 14 1","pages":"235-237"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77861901","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}
Pub Date : 2016-09-01DOI: 10.1109/METAMATERIALS.2016.7746430
F. Bagci, F. Medina
A dual-band metamaterial absorber operating at two wireless local area network bands, 2.45 GHz and 5.61 GHz, is designed based on a systematic methodology that involves equivalent circuit model calculations and full-wave electromagnetic simulations. The unit cell of the absorber consists of two kinds of Jerusalem cross resonators, one of which is rotated 45 degrees with respect to the other, on a metal backed lossy dielectric. Interdigitated capacitors are introduced as the capacitive components of one of the Jerusalem cross resonators to reduce the absorption resonance frequency and electrical size. The proposed dual-band metamaterial absorber shows absorption rates of 99.83 % and 98.98% for the lower and upper absorption bands, respectively. Furthermore, it presents a robust performance under oblique incidence angles for both transverse-electric and transverse-magnetic polarizations.
{"title":"Design of a dual-band metamaterial absorber in WLAN bands with high stability over incidence angle and polarization","authors":"F. Bagci, F. Medina","doi":"10.1109/METAMATERIALS.2016.7746430","DOIUrl":"https://doi.org/10.1109/METAMATERIALS.2016.7746430","url":null,"abstract":"A dual-band metamaterial absorber operating at two wireless local area network bands, 2.45 GHz and 5.61 GHz, is designed based on a systematic methodology that involves equivalent circuit model calculations and full-wave electromagnetic simulations. The unit cell of the absorber consists of two kinds of Jerusalem cross resonators, one of which is rotated 45 degrees with respect to the other, on a metal backed lossy dielectric. Interdigitated capacitors are introduced as the capacitive components of one of the Jerusalem cross resonators to reduce the absorption resonance frequency and electrical size. The proposed dual-band metamaterial absorber shows absorption rates of 99.83 % and 98.98% for the lower and upper absorption bands, respectively. Furthermore, it presents a robust performance under oblique incidence angles for both transverse-electric and transverse-magnetic polarizations.","PeriodicalId":6587,"journal":{"name":"2016 10th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS)","volume":"2 1","pages":"46-48"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81906637","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}
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