Journal ArticleDOI
Designing Spatial Kramers–Kronig Media Using Transformation Optics
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In this article, conformal transformation optics methods are applied to design spatial KK media, which can achieve smooth perfect absorption both in cylindrical spaces and in polygonal spaces with sharp corners.Abstract:
Spatial Kramers–Kronig (KK) relations have been recently proposed to achieve perfect absorption without using any gain elements or highly anisotropic materials. However, such perfect absorption is limited to the surface of an infinitely long planar slab in the Cartesian coordinate, and the cases of surfaces with bends or sharp corners are still challenging. In this article, we apply conformal transformation optics methods to design spatial KK media, which can achieve smooth perfect absorption both in cylindrical spaces and in polygonal spaces with sharp corners. Moreover, it is demonstrated that we can also control the scattering direction of the designed polygonal spatial KK media to realize invisibility. Our work opens new avenues for perfect absorption devices based on transformation optics and spatial KK relations.read more
Citations
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Journal ArticleDOI
A Miniaturized Anechoic Chamber: Omnidirectional Impedance Matching Based on Truncated Spatial Kramers–Kronig Medium
TL;DR: In this article , the concept of spatial KK relation to cylindrical coordinates is extended and a double-resonance space-frequency KK permittivity profile is implemented in a circular geometry.
Journal ArticleDOI
Controlled unidirectional reflection in cold atoms via the spatial Kramers-Kronig relation.
TL;DR: In this article, a mechanism to implement spatial KK relations in a cold atomic sample and use it to control unidirectional reflectionless for probe light incident from either the left or right side of the sample at will was proposed.
Journal ArticleDOI
A conformal transformation approach to wide-angle illusion device and absorber
TL;DR: In this paper, the authors proposed an illusion device designed by a conformal transformation that can render an elliptic defect behave like a flat mirror and achieve an impedance-matched flat absorber by simply varying the shape and the refractive index of the defects.
Proceedings ArticleDOI
A Miniaturized Frequency Reconfigurable Anechoic Chamber Based on Omnidirectional Reflectionless Absorption Spatial Kramers-Kronig Medium
TL;DR: In this paper , the concept of spatial KK relation to cylindrical coordinates is extending and a dual-Lorentz-resonance space-frequency KK permittivity profile is implemented in order to achieve impedance matching to free space.
Journal ArticleDOI
Spatial Kramers-Kronig relation and unidirectional light reflection induced by Rydberg interactions
TL;DR: In this paper , a two-level configuration for the target atoms in the far-detuned driving regime of both lower and upper transitions while maintaining the maximal Rydberg excitations for the control atoms via an antiblockade driving scheme of the upper and lower transitions is proposed.
References
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TL;DR: This work shows how electromagnetic fields can be redirected at will and proposes a design strategy that has relevance to exotic lens design and to the cloaking of objects from electromagnetic fields.
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Metamaterial Electromagnetic Cloak at Microwave Frequencies
David Schurig,Jack J. Mock,B.J. Justice,Steven A. Cummer,John B. Pendry,Anthony F. Starr,David R. Smith +6 more
TL;DR: This work describes here the first practical realization of a cloak of invisibility, constructed with the use of artificially structured metamaterials, designed for operation over a band of microwave frequencies.
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Optical Conformal Mapping
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Electromagnetic interference shielding with 2D transition metal carbides (MXenes)
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TL;DR: The mechanical flexibility and easy coating capability offered by MXenes and their composites enable them to shield surfaces of any shape while providing high EMI shielding efficiency.
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Parity–time synthetic photonic lattices
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TL;DR: The experimental observation of light transport in large-scale temporal lattices that are parity–time symmetric is reported and it is demonstrated that periodic structures respecting this symmetry can act as unidirectional invisible media when operated near their exceptional points.