Pub Date : 2016-09-01DOI: 10.1109/METAMATERIALS.2016.7746470
T. Karamanos, N. Kantartzis
In this paper, the effective parameters of infinite 3D arrays composed of bianisotropic particles for oblique wave illumination are extracted. First, the polarizability matrix of the simple bianisotropic scatterers that constitute the array is obtained along with the complex wavenumber for oblique propagation through the same array. Findings are, then, implemented into a first-principles homogenization technique and the desired effective parameters are finally retrieved. The proposed methodology is applied to two well-known bianistropic particles for various incidence angles of propagation.
{"title":"Effective parameter retrieval of 3D bianisotropic scatterer arrays for oblique propagation","authors":"T. Karamanos, N. Kantartzis","doi":"10.1109/METAMATERIALS.2016.7746470","DOIUrl":"https://doi.org/10.1109/METAMATERIALS.2016.7746470","url":null,"abstract":"In this paper, the effective parameters of infinite 3D arrays composed of bianisotropic particles for oblique wave illumination are extracted. First, the polarizability matrix of the simple bianisotropic scatterers that constitute the array is obtained along with the complex wavenumber for oblique propagation through the same array. Findings are, then, implemented into a first-principles homogenization technique and the desired effective parameters are finally retrieved. The proposed methodology is applied to two well-known bianistropic particles for various incidence angles of propagation.","PeriodicalId":6587,"journal":{"name":"2016 10th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS)","volume":"2 1","pages":"154-156"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88948251","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.2016.7746393
D. Sounas, L. Quan, Panush, A. Alú
Non-static media have recently raised significant attention in the research community for their ability to break reciprocity without the use of magnetic fields. Different approaches to realize such media have been proposed in electromagnetics and acoustics, including mechanical motion and spatiotemporal modulation. Here, we connect these two approaches and show that they can both be derived from the same fundamental relativistic principles. We start our analysis with linear mechanical motion, and show that in the case of near-zero refractive index it is possible to achieve positive and negative refractive index for opposite propagation directions. Next, we show that a similar effect can be achieved with a moving Bragg grating, which can be realized through spatiotemporal modulation, thus avoiding any practically-challenging physical motion. We also show that similar remarks apply to the case of spinning ring resonators, which can form the basis of magnet-less acoustical and electromagnetic circulators. Finally, we discuss the consequences of the equivalence between physical motion and spatiotemporal modulation to applications beyond non-reciprocity, such as spontaneous light generation from dielectric or plasmonic slabs in relative motion with each other.
{"title":"Mechanical motion and spatiotemporal modulation to realize non-reciprocal and active metamaterials","authors":"D. Sounas, L. Quan, Panush, A. Alú","doi":"10.1109/METAMATERIALS.2016.7746393","DOIUrl":"https://doi.org/10.1109/METAMATERIALS.2016.7746393","url":null,"abstract":"Non-static media have recently raised significant attention in the research community for their ability to break reciprocity without the use of magnetic fields. Different approaches to realize such media have been proposed in electromagnetics and acoustics, including mechanical motion and spatiotemporal modulation. Here, we connect these two approaches and show that they can both be derived from the same fundamental relativistic principles. We start our analysis with linear mechanical motion, and show that in the case of near-zero refractive index it is possible to achieve positive and negative refractive index for opposite propagation directions. Next, we show that a similar effect can be achieved with a moving Bragg grating, which can be realized through spatiotemporal modulation, thus avoiding any practically-challenging physical motion. We also show that similar remarks apply to the case of spinning ring resonators, which can form the basis of magnet-less acoustical and electromagnetic circulators. Finally, we discuss the consequences of the equivalence between physical motion and spatiotemporal modulation to applications beyond non-reciprocity, such as spontaneous light generation from dielectric or plasmonic slabs in relative motion with each other.","PeriodicalId":6587,"journal":{"name":"2016 10th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS)","volume":"94 1","pages":"343-345"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90989988","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.2016.7746514
G. Papari, G. Testa, R. Bernini, A. Andreone
Electromagnetic properties of a photonic crystal slab in the shape of a two dimensional periodic lattice of polydimethylsiloxane (PDMS) rods with square symmetry is investigated through the use of THz time domain spectroscopy. The fit of the transmission through a full wave simulation give insights on the guided mechanism responsible for the onset of a resonance at about f0 = 1.57THz. The device can be exploited for enhanced sensing experiments of different organic/biological substances as supported by full wave simulations.
{"title":"A PDMS photonic crystal slab for THz sensing","authors":"G. Papari, G. Testa, R. Bernini, A. Andreone","doi":"10.1109/METAMATERIALS.2016.7746514","DOIUrl":"https://doi.org/10.1109/METAMATERIALS.2016.7746514","url":null,"abstract":"Electromagnetic properties of a photonic crystal slab in the shape of a two dimensional periodic lattice of polydimethylsiloxane (PDMS) rods with square symmetry is investigated through the use of THz time domain spectroscopy. The fit of the transmission through a full wave simulation give insights on the guided mechanism responsible for the onset of a resonance at about f0 = 1.57THz. The device can be exploited for enhanced sensing experiments of different organic/biological substances as supported by full wave simulations.","PeriodicalId":6587,"journal":{"name":"2016 10th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS)","volume":"4 1","pages":"274-276"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73473070","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.2016.7746451
A. Dorofeenko, A. M. Pikalov, A. Vinogradov, A. Granovsky
Split-ring resonator (SRR) axial chain is considered with the account of retardation and non-nearest neighbor interactions. In the case of the first element excitation, the appearance of nonexponential decay is revealed. The features of the Fourier transform of the current amplitude distribution in the chain are related to the solutions in the infinite chain. The nonexponential contribution is interpreted as a result of excitation of a family of damping solutions, which are found in the infinite chain.
{"title":"Non-nearest neighbours interactions in SRR Chains","authors":"A. Dorofeenko, A. M. Pikalov, A. Vinogradov, A. Granovsky","doi":"10.1109/METAMATERIALS.2016.7746451","DOIUrl":"https://doi.org/10.1109/METAMATERIALS.2016.7746451","url":null,"abstract":"Split-ring resonator (SRR) axial chain is considered with the account of retardation and non-nearest neighbor interactions. In the case of the first element excitation, the appearance of nonexponential decay is revealed. The features of the Fourier transform of the current amplitude distribution in the chain are related to the solutions in the infinite chain. The nonexponential contribution is interpreted as a result of excitation of a family of damping solutions, which are found in the infinite chain.","PeriodicalId":6587,"journal":{"name":"2016 10th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS)","volume":"9 1","pages":"103-105"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74667652","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.2016.7746498
A. Monti, J. Soric, M. Barbuto, D. Ramaccia, S. Vellucci, F. Trotta, A. Alú, A. Toscano, F. Bilotti
In this contribution, we review our latest results about the unprecedented possibilities enabled by electromagnetic cloaking in antenna theory and applications. In particular, we show that, in the receiving regime, cloaking allows designing antennas exhibiting a minimum level of scattering for a given level of absorbed power, whereas, in the transmitting one, cloaking enables the co-sitting of different antennas in a confined region. Both full-wave and experimental results are presented to support the theoretical considerations.
{"title":"Cloaking receiving and transmitting antennas: Theoretical aspects and applications","authors":"A. Monti, J. Soric, M. Barbuto, D. Ramaccia, S. Vellucci, F. Trotta, A. Alú, A. Toscano, F. Bilotti","doi":"10.1109/METAMATERIALS.2016.7746498","DOIUrl":"https://doi.org/10.1109/METAMATERIALS.2016.7746498","url":null,"abstract":"In this contribution, we review our latest results about the unprecedented possibilities enabled by electromagnetic cloaking in antenna theory and applications. In particular, we show that, in the receiving regime, cloaking allows designing antennas exhibiting a minimum level of scattering for a given level of absorbed power, whereas, in the transmitting one, cloaking enables the co-sitting of different antennas in a confined region. Both full-wave and experimental results are presented to support the theoretical considerations.","PeriodicalId":6587,"journal":{"name":"2016 10th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS)","volume":"20 1","pages":"232-234"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73223710","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.2016.7746416
F. Mesa, A. Forouzmand, A. Yakovlev, G. Hanson, F. Medina, R. Rodríguez-Berral
In this paper, we establish a general framework for understanding subwavelength imaging by means of complex-plane analysis of the Sommerfeld integral for a magnetic line source over a subwavelength imaging lens. The Sommerfeld integral of the transmitted field is calculated in terms of discrete and continuous spectra. This spectral decomposition makes it possible to achieve physical insight regarding the imaging mechanisms. The results are obtained for a stack of silver slabs, an isolated wire-medium (WM) slab, and for a WM loaded with graphene sheets (GSs) and graphene patches (GPs).
{"title":"Discrete and continuous spectrum analysis: An alternative perspective on subwavelength imaging","authors":"F. Mesa, A. Forouzmand, A. Yakovlev, G. Hanson, F. Medina, R. Rodríguez-Berral","doi":"10.1109/METAMATERIALS.2016.7746416","DOIUrl":"https://doi.org/10.1109/METAMATERIALS.2016.7746416","url":null,"abstract":"In this paper, we establish a general framework for understanding subwavelength imaging by means of complex-plane analysis of the Sommerfeld integral for a magnetic line source over a subwavelength imaging lens. The Sommerfeld integral of the transmitted field is calculated in terms of discrete and continuous spectra. This spectral decomposition makes it possible to achieve physical insight regarding the imaging mechanisms. The results are obtained for a stack of silver slabs, an isolated wire-medium (WM) slab, and for a WM loaded with graphene sheets (GSs) and graphene patches (GPs).","PeriodicalId":6587,"journal":{"name":"2016 10th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS)","volume":"57 1","pages":"406-408"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79262803","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.2016.7746503
B. Okorn, S. Hrabar, J. Sancho-Parramon, A. Perić
Original concept of `D-dot' wire relies on a dielectric cylinder embedded in an isotropic ENZ host that acts as an `optical insulator', causing directional flow of the displacement current. Here, it is shown that a directional flow of displacement current can also be achieved by using anisotropic ENZ `insulating' tube of finite thickness. This guiding phenomenon was investigated by scaled RF experiments.
{"title":"Streamlined flow of displacement current in metatronic-inspired anisotropic structure","authors":"B. Okorn, S. Hrabar, J. Sancho-Parramon, A. Perić","doi":"10.1109/METAMATERIALS.2016.7746503","DOIUrl":"https://doi.org/10.1109/METAMATERIALS.2016.7746503","url":null,"abstract":"Original concept of `D-dot' wire relies on a dielectric cylinder embedded in an isotropic ENZ host that acts as an `optical insulator', causing directional flow of the displacement current. Here, it is shown that a directional flow of displacement current can also be achieved by using anisotropic ENZ `insulating' tube of finite thickness. This guiding phenomenon was investigated by scaled RF experiments.","PeriodicalId":6587,"journal":{"name":"2016 10th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS)","volume":"3 1","pages":"244-246"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80774245","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.2016.7746450
Y. Fan, A. Lupu, A. de Lustrac
In this study we describe the design, the simulation and the characterization of a waveguided plasmonic lens on SOI. The lens is made of gold nanowires on a SOI waveguide. A thin silicon dioxide layer separates the gold nanowires from the SOI waveguide. This lens is made of a gradient index corresponding to the effective index of the gold wires on the silicon waveguide. Simulations and characterizations demonstrate that this device can be very efficient to focalize light at infrared wavelength.
{"title":"Infrared waveguided graded-index plasmonic lens on SOI in TE mode","authors":"Y. Fan, A. Lupu, A. de Lustrac","doi":"10.1109/METAMATERIALS.2016.7746450","DOIUrl":"https://doi.org/10.1109/METAMATERIALS.2016.7746450","url":null,"abstract":"In this study we describe the design, the simulation and the characterization of a waveguided plasmonic lens on SOI. The lens is made of gold nanowires on a SOI waveguide. A thin silicon dioxide layer separates the gold nanowires from the SOI waveguide. This lens is made of a gradient index corresponding to the effective index of the gold wires on the silicon waveguide. Simulations and characterizations demonstrate that this device can be very efficient to focalize light at infrared wavelength.","PeriodicalId":6587,"journal":{"name":"2016 10th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS)","volume":"32 1","pages":"100-102"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81027522","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.2016.7746427
M. Havrilla
A field decomposition of Maxwell's equations for uniaxial hyperbolic media based on the 2D Helmholtz theorem is provided. This decomposition is particularly useful since it produces TE and TM field sets that are orthogonal and allows for identification of two independent scalar potential formulations. It is shown that these formulations provide substantial mathematical simplification, enhanced physical insight, ease of boundary condition enforcement and a trivial field recovery process. An example involving a parallel-plate waveguide filled with hyperbolic media is given to demonstrate the functionality and practicality of the decomposition.
{"title":"Field decomposition for analysis of hyperbolic media","authors":"M. Havrilla","doi":"10.1109/METAMATERIALS.2016.7746427","DOIUrl":"https://doi.org/10.1109/METAMATERIALS.2016.7746427","url":null,"abstract":"A field decomposition of Maxwell's equations for uniaxial hyperbolic media based on the 2D Helmholtz theorem is provided. This decomposition is particularly useful since it produces TE and TM field sets that are orthogonal and allows for identification of two independent scalar potential formulations. It is shown that these formulations provide substantial mathematical simplification, enhanced physical insight, ease of boundary condition enforcement and a trivial field recovery process. An example involving a parallel-plate waveguide filled with hyperbolic media is given to demonstrate the functionality and practicality of the decomposition.","PeriodicalId":6587,"journal":{"name":"2016 10th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS)","volume":"60 1","pages":"436-438"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90208310","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.2016.7746394
D. Sounas, N. Estakhri, A. Alú
Gradient metasurfaces have recently received significant attention for the unique opportunities they offer for advanced wave manipulation. Such metasurfaces are usually discrete implementations of surface impedance profiles, which are analytically derived to yield the desired operation. Several recent numerical and experimental studies have shown that gradient metasurfaces can work very well over large bandwidths, extending to frequencies where the definition of surface impedance is not straightforward. Here, we develop an alternative description of such metasurfaces based on coupled-mode theory and provide an explanation for this intriguing effect. Quite surprisingly, our theory shows that broadband anomalous reflection and transmission, does not necessarily require the use of spatial gradients, but they can be achieved through suitably designed periodic arrays of resonant particles. In addition to their theoretical importance, our results can be important for the design of efficient metasurfaces with specified frequency response.
{"title":"Metasurfaces with engineered reflection and transmission: Optimal designs through coupled-mode analysis","authors":"D. Sounas, N. Estakhri, A. Alú","doi":"10.1109/METAMATERIALS.2016.7746394","DOIUrl":"https://doi.org/10.1109/METAMATERIALS.2016.7746394","url":null,"abstract":"Gradient metasurfaces have recently received significant attention for the unique opportunities they offer for advanced wave manipulation. Such metasurfaces are usually discrete implementations of surface impedance profiles, which are analytically derived to yield the desired operation. Several recent numerical and experimental studies have shown that gradient metasurfaces can work very well over large bandwidths, extending to frequencies where the definition of surface impedance is not straightforward. Here, we develop an alternative description of such metasurfaces based on coupled-mode theory and provide an explanation for this intriguing effect. Quite surprisingly, our theory shows that broadband anomalous reflection and transmission, does not necessarily require the use of spatial gradients, but they can be achieved through suitably designed periodic arrays of resonant particles. In addition to their theoretical importance, our results can be important for the design of efficient metasurfaces with specified frequency response.","PeriodicalId":6587,"journal":{"name":"2016 10th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS)","volume":"35 1","pages":"346-348"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87380327","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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