Far-Field and Near-Field Physics of Extraordinary THz Transmitting Hole-Array Antennas

Camacho, Miguel; Boix, Rafael R.; Kuznetsov, S. А.; Beruete, Miguel; Navarro‐Cía, Miguel

doi:10.1109/tap.2019.2920262

Cited by 19 publications

(18 citation statements)

References 40 publications

(60 reference statements)

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“…obtained by MRW [31][32][33] or by DE [34,35] quadrature rules are used as comparison patterns. However, the performance of these two types of quadrature rules have never been compared to each other in an MoM context.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…Both MRW [21,25,28] and DE [27,29,30] quadrature rules have been successfully used for the determination of integrals with singularities that arise in the application of the MoM for multilayer problems. In more recent works, results obtained by MRW [31][32][33] or by DE [34,35] quadrature rules are used as comparison patterns. However, the performance of these two types of quadrature rules have never been compared to each other in an MoM context.…”

Section: Description Of the Problemmentioning

confidence: 99%

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Comparison between Specialized Quadrature Rules for Method of Moments with NURBS Modelling Applied to Periodic Multilayer Structures

et al. 2020

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A comparison between Ma-Rokhlin-Wandzura (MRW) and double exponential (DE) quadrature rules for numerical integration of method of moments (MoM) matrix entries with singular behavior is presented for multilayer periodic structures. Non Uniform Rational B-Splines (NURBS) modelling of the layout surfaces is implemented to provide high-order description of the geometry. The comparison is carried out in order to show that quadrature rule is more suitable for MoM matrix computation in terms of sampling, accuracy of computation of MoM matrix, and CPU time consumption. The comparison of CPU time consumption shows that the numerical integration with MRW samples is roughly 15 times faster than that numerical integration using DE samples for results with similar accuracies. These promising results encourage to carry out a comparison with results obtained in previous works where a specialized approach for the specific analysis of split rings geometries was carried out. This previous approach uses spectral MoM version with specific entire domain basis function with edge singularities defined on split ring geometry. Thus, the previous approach provides accurate results with low CPU time consumption to be compared. The comparison shows that CPU time consumption obtained by MRW samples is similar to the CPU time consumption required by the previous work of specific analysis of split rings geometries. The fact that similar CPU time consumptions are obtained by MRW quadrature rules for modelling of general planar geometries and by the specialized approach for split ring geometry provides an assessment for the usage of the MRW quadrature rules and NURBS modelling. This fact provides an efficient tool for analysis of reflectarray elements with general planar layout geometries, which is suitable for reflectarray designs under local periodicity assumption where a huge number of periodic multilayer structures have to be analyzed.

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Section: Numerical Resultsmentioning

confidence: 99%

Section: Description Of the Problemmentioning

confidence: 99%

Comparison between Specialized Quadrature Rules for Method of Moments with NURBS Modelling Applied to Periodic Multilayer Structures

et al. 2020

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“…To introduce the illumination effects, a 1-D Gaussian beam profile is used as the impinging wave for the calculation of J as (x, y), as in [28]. In the experiment, almost total transmission is obtained when N y = 61, whereas the MoM predicts total transmission.…”

Section: Measurements and Discussionmentioning

confidence: 99%

“…For instance, when the unit cell presents a symmetry plane aligned with the periodicity (electric wall, for instance), this inhibits the EOT peak associated with such lattice vector [27]. As it was shown there, this means that when finite arrays are considered, one can ignore the finite size effects along one of the periodicities if the unit cell presents symmetries that inhibit that resonance, as the surface wave along the short direction will not couple to the radiation and therefore cannot sense the truncations of the system [28], [29].…”

Section: Introductionmentioning

confidence: 99%

Symmetry and Finite-Size Effects in Quasi-Optical Extraordinarily THz Transmitting Arrays of Tilted Slots

Camacho

Nekovic

Freer

et al. 2020

IEEE Trans. Antennas Propagat.

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Extraordinarily transmitting arrays are promising candidates for quasi-optical (QO) components due to their high frequency selectivity and beam scanning capabilities owing to the leaky-wave mechanism involved. We show here how by breaking certain unit cell and lattice symmetries, one can achieve a rich family of transmission resonances associated with the leaky-wave dispersion along the surface of the array. By combining two dimensional and one dimensional periodic Method of Moments (MoM) calculations with QO Terahertz (THz) timedomain measurements, we provide physical insight, numerical and experimental demonstration of the different mechanisms involved in the resonances associated with the extraordinary transmission peaks and how these evolve with the number of slots. Thanks to the THz instrument used, we are also able to explore the time-dependent emission of the different frequency components involved.

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“…1(a). Precise knowledge of the beam parameters over the whole frequency range of the system (more than a decade for THz TDS) is fundamental for spectroscopy [11], [12] and imaging [4]. This includes not only the beam waist (i.e.…”

Section: Introductionmentioning

confidence: 99%

Beam Profiling of a Commercial Lens-Assisted Terahertz Time Domain Spectrometer

Freer

Gorodetsky

Navarro‐Cía

2021

IEEE Trans. THz Sci. Technol.

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To undertake THz spectroscopy and imaging, and accurately design and predict the performance of quasi-optical components, knowledge of the parameters of the beam (ideally Gaussian) emitted from a THz source is paramount. Despite its proliferation, relatively little work has been done on this in the frame of broadband THz photoconductive antennas. Using primarily pinhole scanning methods, along with stepwise angular spectrum simulations, we investigate the profile and polarization characteristics of the beam emitted by a commercial silicon-lensintegrated THz photoconductive antenna and collimated by a TPX (polymethylpentene) lens. Our study flags the limitations of the different beam profiling methods and their impact on the beam Gaussianity estimation. A non-Gaussian asymmetric beam is observed, with main lobe beam waists along x and y varying from 8.4±0.7 mm and 7.7±0.7 mm at 0.25 THz, to 1.4±0.7 mm and 1.4±0.7 mm at 1 THz, respectively. Additionally, we report a maximum cross-polar component relative to the on-axis co-polar component of-11.6 dB and-21.2 dB, at 0.25 THz and 1 THz, respectively.

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Far-Field and Near-Field Physics of Extraordinary THz Transmitting Hole-Array Antennas

Cited by 19 publications

References 40 publications

Comparison between Specialized Quadrature Rules for Method of Moments with NURBS Modelling Applied to Periodic Multilayer Structures

Comparison between Specialized Quadrature Rules for Method of Moments with NURBS Modelling Applied to Periodic Multilayer Structures

Symmetry and Finite-Size Effects in Quasi-Optical Extraordinarily THz Transmitting Arrays of Tilted Slots

Beam Profiling of a Commercial Lens-Assisted Terahertz Time Domain Spectrometer

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