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Transformation optics

About: Transformation optics is a research topic. Over the lifetime, 2687 publications have been published within this topic receiving 102378 citations.


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Journal ArticleDOI
TL;DR: In this paper, the authors performed a detailed study of the phenomenon of resonant absorption that occurs at an oblique incidence in the vicinity of the zero refractive index transition in graded index metamaterials.
Abstract: We perform a detailed study of the phenomenon of resonant absorption that occurs at an oblique incidence in the vicinity of the zero refractive index transition in graded index metamaterials with the refractive index changing from positive to negative values. We compare the results of numerical simulations with analytical predictions for the case of the linear gradient index profile. Furthermore, we numerically study the transition phenomena in graded index layers with more complex index profiles. A detailed understanding of the phenomenon of resonant absorption may be of considerable importance in the context of transformation optics as it strongly modifies the field distribution near the zero index transition.

16 citations

Journal ArticleDOI
TL;DR: A mode adapter that transitions light between two SOI waveguides having different widths is reported on, which can be implemented with planar optical metamaterials for various applications in guided optics.
Abstract: We report on a mode adapter that transitions light between two SOI waveguides having different widths. The device has been designed using a two-dimensional embedded coordinate transformation and consists of a thin sheet of a controlled anisotropic material directly placed on top of the Si slab. We demonstrate that this layer effectively controls the flow of energy propagating in the Si slab by performing three-dimensional full-wave simulations. The proposed geometry can be implemented with planar optical metamaterials for various applications in guided optics.

16 citations

Journal ArticleDOI
TL;DR: It was observed that the realization results exhibit strong agreement with the theoretical investigations and corroborate the generality and effectiveness of the proposed designing method.
Abstract: The concentration of electromagnetic waves is of utmost importance in many engineering applications such as energy harvesting devices. According to the transformation optics methodology, a feasible approach for obtaining arbitrary shape concentrators is proposed. Contrary to the previous works, the obtained materials are homogeneous and independent of the concentrator shape. That is, regardless of the input geometry, always one constant material, which is optic-null medium (ONM), is used, and the performance of the device will not alter. This competency will ease the design process and circumvent the sophisticated calculations of the necessitating materials. To demonstrate such a capability, several numerical full-wave simulations were performed for different shapes of concentrators. Furthermore, with the aid of effective medium theory (EMT), the ONM was realized using split-ring resonator-meander line metamaterial blocks. Then, as a proof of concept, an arbitrary shape concentrator was designed according to EMT and by exploiting the retrieved parameters of the realized metamaterials. It was observed that the realization results exhibit strong agreement with the theoretical investigations and corroborate the generality and effectiveness of the proposed designing method.The concentration of electromagnetic waves is of utmost importance in many engineering applications such as energy harvesting devices. According to the transformation optics methodology, a feasible approach for obtaining arbitrary shape concentrators is proposed. Contrary to the previous works, the obtained materials are homogeneous and independent of the concentrator shape. That is, regardless of the input geometry, always one constant material, which is optic-null medium (ONM), is used, and the performance of the device will not alter. This competency will ease the design process and circumvent the sophisticated calculations of the necessitating materials. To demonstrate such a capability, several numerical full-wave simulations were performed for different shapes of concentrators. Furthermore, with the aid of effective medium theory (EMT), the ONM was realized using split-ring resonator-meander line metamaterial blocks. Then, as a proof of concept, an arbitrary shape concentrator was designed according...

16 citations

Journal ArticleDOI
TL;DR: It is shown that the artificial magnetism arises from the extreme coupling between both metallic films forming the unit cell and its electromagnetic response can be properly described by biaxial local constitutive relations.
Abstract: Most left-handed metamaterials cannot be described by local effective permittivity or permeability tensors in the visible or near-infrared due to the mesoscopic size of the respective unit cells and the related strong spatial dispersion. We lift this problem and propose a metamaterial exhibiting artificial magnetism that does not suffer from this restriction. The artificial magnetism arises from the extreme coupling between both metallic films forming the unit cell. We show that its electromagnetic response can be properly described by biaxial local constitutive relations. A genuine biaxial left-handed fishnet metamaterial is suggested, which can be realized by atomic layer deposition to fabricate the nanoscaled spacing layers required for extreme coupling.

16 citations

Journal ArticleDOI
TL;DR: In the present Letter, it is shown that the electromagnetic field is localized into a region of lambda/8, where lambda is the cavity resonance wavelength.
Abstract: We report subwavelength localization of electromagnetic fields within cavities based on metamaterials. Cavity resonances are observed in the transmission spectrum of a split-ring resonator and composite metamaterials cavity structures. These cavity resonances are shown to exhibit high-quality factors. Since the unit cells of metamaterials are much smaller than the operation wavelength, subwavelength localization is possible within these metamaterial cavity structures. In the present Letter, we show that the electromagnetic field is localized into a region of λ/8, where λ is the cavity resonance wavelength.

16 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202324
202269
202147
202070
2019100
201890