Geometric optics-based multiband cloaking of large objects with the wave phase and amplitude preservation.
TLDR
The geometric optics principles are used to develop a unidirectional transmission cloak for hiding objects with dimensions substantially exceeding the incident radiation wavelengths, and it demonstrates efficient multiband performance confirmed by full-wave simulations.Abstract:
The geometric optics principles are used to develop a unidirectional transmission cloak for hiding objects with dimensions substantially exceeding the incident radiation wavelengths. Invisibility of both the object and the cloak is achieved without metamaterials, so that significant widths of the cloaking bands are provided. For the preservation of wave phases, the λ-multiple delays of waves passing through the cloak are realized. Suppression of reflection losses is achieved by using half-λ multiple thicknesses of optical elements. Due to periodicity of phase delay and reflection suppression conditions, the cloak demonstrates efficient multiband performance confirmed by full-wave simulations.read more
Citations
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Journal ArticleDOI
High-transmission acoustic self-focusing and directional cloaking in a graded perforated metal slab.
TL;DR: A design strategy and its modeling for high-transmission acoustic self-focusing and directional cloaking in a two-dimensional and an axisymmetric three-dimensional gradient-index phononic crystal (GRIN-PC) are reported in this paper.
Journal ArticleDOI
Paraxial full-field cloaking.
Joseph S. Choi,John C. Howell +1 more
TL;DR: It is shown that an isotropic plate of uniform thickness, with appropriately designed refractive index and dispersion, can match the phase over the whole visible spectrum and support the fundamental limits on cloaking for broadband vs. omnidirectionality.
Patent
Paraxial cloak design and device
Joseph S. Choi,John C. Howell +1 more
TL;DR: A paraxial cloaking device provides a cloaking volume in which an item can be hidden from view as discussed by the authors, where an optical input receiving light rays and an optical output from which a continuous range of directions of the received light rays exit the cloaking devices.
Patent
Cloaking systems and methods
Joseph S. Choi,John C. Howell +1 more
TL;DR: Digital cloaking is a method for practical cloaking, where space, angle, spectrum and phase are discretized At the sacrifice of spatial resolution, a good approximation to an ideal cloak can be achieved - a cloak that is omnidirectional, broadband, and operational for the visible spectrum, three-dimensional (3D), and phase-matching for the light field, among other attributes as mentioned in this paper.
Journal ArticleDOI
Controlling lightwave in Riemann space by merging geometrical optics with transformation optics.
TL;DR: This mixed method overcomes the limitations of classic optical design and gives intuitive guidance for optical design by transformation optics; at the same time, three novel optical devices with fantastic functions have been designed using this mixed method.
References
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Journal ArticleDOI
Controlling Electromagnetic Fields
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.
Journal ArticleDOI
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 cloaking with metamaterials
TL;DR: This work presents the design of a non-magnetic cloak operating at optical frequencies, and the principle and structure of the proposed cylindrical cloak are analysed and the general recipe for the implementation of such a device is provided.
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Hiding under the Carpet: A New Strategy for Cloaking
TL;DR: A new type of cloak is discussed: one that gives all cloaked objects the appearance of a flat conducting sheet that has the advantage that none of the parameters of the cloak is singular and can in fact be made isotropic.
Journal ArticleDOI
An optical cloak made of dielectrics
TL;DR: The optical 'carpet' cloak is designed using quasi-conformal mapping to conceal an object that is placed under a curved reflecting surface by imitating the reflection of a flat surface and enables broadband and low-loss invisibility at a wavelength range of 1,400-1,800 nm.