Subwavelength focusing by optical surface transformation

Sun, Fei; He, Sailing

doi:10.1016/j.optcom.2018.06.029

Cited by 4 publications

(3 citation statements)

References 65 publications

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“…Two surfaces linked by optic-null medium (ONM) are equivalent surfaces in OST [18]. OST is broadly applicable in the design of lenses [18,20], electromagnetic open resonators [21], overlapped illusions [22], waveguide bends [23], scattering cover-up cloaks [24], subwavelength focusing [25], etc. ONM has extremely large permittivity and permeability along its main axis, and close to zero in orthogonal directions.…”

Section: Theoretical Methodsmentioning

confidence: 99%

A Camouflage Device Without Metamaterials

Sun¹,

Zhang²,

Evans³

et al. 2019

PIER

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We propose a camouflage device that can greatly reduce scattering in the microwave frequency using only uniform copper plates with no internal structuring (no metamaterials). The camouflage device is designed by optical surface transformation (OST), which is derived from transformation optics but much simpler than transformation optics. The key of our design is to choose suitable arrangement and lengths of these copper plates that satisfy Fabry-Perot condition. The proposed camouflage device can work when the detecting wave comes from a wide-angle range (not only works for some discrete angles). The proposed method will give a new and simple way to design and realize camouflage device.

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Section: Theoretical Methodsmentioning

confidence: 99%

A Camouflage Device Without Metamaterials

Sun¹,

Zhang²,

Evans³

et al. 2019

PIER

Self Cite

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“…Among the materials obtained from these transformations, the one that is attained from mapping a surface into a volume is known as the optic-null medium (ONM) and attract scientists' attentions due to its unique characteristics. For instance, Sun et al utilized ONM for designing different functionalities such as waveguide bends 23 , wave front reshaping devices 24 and other interesting novel applications [25][26][27][28][29][30] . Furthermore, it is well known that single conductor waveguides (e.g.…”

Section: Introductionmentioning

confidence: 99%

Geometry free materials enabled by transformation optics for enhancing the intensity of electromagnetic waves in an arbitrary domain

Abdolali

Sedeh

Fakheri

2020

Journal of Applied Physics

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The concentration of electromagnetic waves (EM) is of utmost importance in many engineering applications such as solar-cells. According to the transformation optics (TO) methodology, a feasible approach for obtaining arbitrary shape concentrators is proposed. In 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 device will not alter. This competency will ease the design process and circumvent the sophisticated calculations of the necessitating materials. To authenticate the concept, several numerical full-wave simulations were performed for different shape concentrators. It was observed that numerical results exhibit strong agreement with the theoretical investigations and corroborate the generality and effectiveness of the proposed designing method.

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“…[26][27][28][29] In this study, we design a hyper-lens with planar object/image surfaces and uniform magnification factor by a novel optic design theory, namely, optical surface transformation (OST). [30][31][32][33] The proposed hyper-lens can be realized by one homogenous anisotropic medium, referred as to optic-null medium (ONM). 34,35) In OST, we use the directional projecting property of ONMs to make the design.…”

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confidence: 99%

Planar hyper-lens with uniform pre-designed magnification factor by homogeneous medium

Sun

et al. 2021

Appl. Phys. Express

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A hyper-lens with planar object/image surfaces and uniform magnification factor is designed based on directional projecting property of optic-null medium (ONM). The proposed planar hyper-lens only requires one homogeneous anisotropic medium, i.e. ONM. We use metallic plates inside ϵ-near-zero medium to realize the proposed hyper-lens. 0.191λ 0 resolution is observed (0.238λ 0 can be clearly resolved) in experimental measurement, which consists very well with 3D numerical simulations and verifies the performance of the proposed planar hyper-lens. The planar hyper-lens with uniform pre-designed magnification factor may have some applications in super-resolution imaging technology.

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Subwavelength focusing by optical surface transformation

Cited by 4 publications

References 65 publications

A Camouflage Device Without Metamaterials

A Camouflage Device Without Metamaterials

Geometry free materials enabled by transformation optics for enhancing the intensity of electromagnetic waves in an arbitrary domain

Planar hyper-lens with uniform pre-designed magnification factor by homogeneous medium

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