Bespoke Lenses Based on Quasi-Conformal Transformation Optics Technique

Ebrahimpouri, Mahsa; Quevedo–Teruel, Oscar

doi:10.1109/tap.2017.2679494

Cited by 49 publications

(37 citation statements)

References 27 publications

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“…This kind of behavior can pave the way for the first time to the realization of all-metal flat UWB anisotropic lenses, thus promising a great flexibility in the synthesis of aperture fields or antenna shape (e.g., if transformation optics is used for the lens design [54], [55]).…”

Section: -D Glide-symmetric Holes: Anisotropymentioning

confidence: 99%

Glide-Symmetric All-Metal Holey Metasurfaces for Low-Dispersive Artificial Materials: Modeling and Properties

Valerio

Ghasemifard

Šipuš

et al. 2018

IEEE Trans. Microwave Theory Techn.

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We study the wave propagation between two glidesymmetric metallic plates drilled with periodic rectangular holes. A mode-matching method is proposed in order to derive efficiently the dispersive properties of these periodic structures. The method takes advantage of the higher symmetry of the structure reducing the computational cost by enforcing boundary conditions on the field on only one of the two surfaces. Physical insight on specific symmetry properties of Floquet harmonics in glide-symmetric structures is also gained. The code is validated with commercial software assessing its accuracy when varying the most influential/critical parameters. We confirm the potential of glide-symmetric structures to tune the effective refractive index. Specifically, we demonstrate that glide-symmetric structures with rectangular shapes can be employed to synthesize anisotropic refractive indexes with a large band of operation, which makes such metasurface structures applicable for realization of UWB planar lenses.

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Section: -D Glide-symmetric Holes: Anisotropymentioning

confidence: 99%

Glide-Symmetric All-Metal Holey Metasurfaces for Low-Dispersive Artificial Materials: Modeling and Properties

Valerio

Ghasemifard

Šipuš

et al. 2018

IEEE Trans. Microwave Theory Techn.

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“…AS an ingenious mathematical approach, transformation optics (TO) [1][2][3][4][5][6] provides a powerful and convenient way to control the electromagnetic (EM) fields arbitrarily, arousing much attentions in the past two decades. Based on this methodology, novel devices with varied functions and applications have been proposed, designed and experimented with an unprecedented prosperity, including invisible cloaks [7][8][9][10][11][12][13], concentrators [14][15][16][17][18], illusory devices [19][20][21][22][23][24][25][26][27][28] and antennas [29][30][31][32][33][34][35] etc. The most striking device among them is invisible cloak, where some properly designed materials are utilized to direct the EM waves propagates smoothly around an arbitrarily shaped object, making the entire device (including the coated object) become invisible for the outside viewers.…”

Section: Introductionmentioning

confidence: 99%

Design of open devices based on multi-folded transformation optics

et al. 2020

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Open devices with homogeneous material parameters are proposed and designed based on multi-folded transformation optics, including open cloak device, open field concentrator and open field amplifying device. In comparison with the previous transformation devices, the proposed open devices possess open windows with compact and embedded structures, providing a flexible approach for remote control or upgrade.The open cloaking devices can hide arbitrarily shaped/sized object in the core region, making it disappeared in visually for the outside viewers, while the open field concentrator can enhance or store EM energy in the core region, and the open field amplifying device can magnify the scattering field of a small object, generating an bigger illusory image with differential material parameter and size. The effectiveness and correctness of the proposed devices are validated by the numerical results obtained based on the commercial finite element software COMSOL Multiphysics. Such scheme is believed to find potential applications in remote controlling with impressive new functions.

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“…The most notable one is the invisibility cloak [6,[63][64][65][66][67][68][69][70][71][72]. Furthermore, numerous devices have been designed using TO including polarization splitters [73][74][75][76][77][78], phase transformers [79][80][81], flat lenses [4,[82][83][84][85][86][87][88][89][90][91], field rotators [92,93], field concentrators [94][95][96], waveguide bends [97][98][99] and waveguide couplers [100][101][102][103][104][105][106][107].…”

Section: Introductionmentioning

confidence: 99%

“…The conformal method is, in most cases, based on a closed-form representation of the mapping, while the quasi-conformal approach includes numerical calculation. Conformal and quasi-conformal mappings have been employed for various purposes including attaining high directivity antennas in the microwave regime [19,87,90,[111][112][113][114][115], reflectors with flat boundaries [116][117][118] and all-dielectric bends [98,108,111,112].…”

Section: Introductionmentioning

confidence: 99%

Elliptical generalized Maxwell fish-eye lens using conformal mapping

et al. 2019

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A circular graded index lens is conformally transformed to an elliptical shape using a closed-form transformation. The proposed transformation is then employed to compress a Maxwell fish-eye and its generalized version. Since the transformation is conformal, the electromagnetic properties of the device are perfectly preserved after the transformation with fully isotropic and dielectriconly materials. Ray-tracing and full-wave simulations are carried out for several cases to verify the functionality of the optically transformed lenses in geometrical optics and wave optics regimes.

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Bespoke Lenses Based on Quasi-Conformal Transformation Optics Technique

Cited by 49 publications

References 27 publications

Glide-Symmetric All-Metal Holey Metasurfaces for Low-Dispersive Artificial Materials: Modeling and Properties

Glide-Symmetric All-Metal Holey Metasurfaces for Low-Dispersive Artificial Materials: Modeling and Properties

Design of open devices based on multi-folded transformation optics

Elliptical generalized Maxwell fish-eye lens using conformal mapping

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