Directional invisibility by genetic optimization

Bor, Emre; Babayigit, Ceren; Kurt, Hamza; Staliūnas, Kęstutis; Turduev, Mırbek

doi:10.1364/ol.43.005781

Cited by 20 publications

(13 citation statements)

References 24 publications

(28 reference statements)

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“…As it was noted, the designed structure has four-fold rotational symmetry, as seen in Figure 1 . Here the rotational and mirror symmetry concepts are realized to provide quasi-omnidirectional invisibility behavior for the structure [ 26 , 41 , 43 ]. In this regard, the proposed structure is optimized considering these symmetry constraints, and the corresponding results are given in Figure 3 c,d.…”

Section: Design Steps and Numerical Resultsmentioning

confidence: 99%

“…Previously in this study, we introduced the design and optimization of a bi-directional cloaking structure by using rectangular-shaped unit cells. Generally, the numerical design and manufacturing of rectangular-shaped unit cells with defined structural parameters are comparably simple and cost-effective [ 43 ]. It is crucial to note that rectangular-shaped unit cells are suitable only for one- and two-directional cloaking structure designs because of the perfect radial alignment between mirror-symmetrized slices.…”

Section: Further Discussion: the Concept Of Multi-directional Cloakingmentioning

confidence: 99%

“…In addition to these studies, the focusing effect is also used for creating invisible regions both in ray and wave optics [ 39 , 40 ]. Finally, the idea of using optimization algorithms for the generation/reshaping of the cloaking region shows promising results [ 41 , 42 , 43 , 44 ]. In this direction, inverse design and topology optimization approaches were used for the design of cloaking devices applied to electromagnetic, acoustic, and water waves [ 45 , 46 , 47 , 48 , 49 ].…”

Section: Introductionmentioning

confidence: 99%

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Multi-Directional Cloak Design by All-Dielectric Unit-Cell Optimized Structure

et al. 2022

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In this manuscript, we demonstrate the design and experimental proof of an optical cloaking structure that multi-directionally conceals a perfectly electric conductor (PEC) object from an incident plane wave. The dielectric modulation around the highly reflective scattering PEC object is determined by an optimization process for multi-directional cloaking purposes. Additionally, to obtain the multi-directional effect of the cloaking structure, an optimized slice is mirror symmetrized through a radial perimeter. The three-dimensional (3D) finite-difference time-domain method is integrated with genetic optimization to achieve a cloaking design. In order to overcome the technological problems of the corresponding devices in the optical range and to experimentally demonstrate the proposed concept, our experiments were carried out on a scale model in the microwave range. The scaled proof-of-concept of the proposed structure is fabricated by 3D printing of polylactide material, and the brass metallic alloy is used as a perfect electrical conductor for microwave experiments. A good agreement between numerical and experimental results is achieved. The proposed design approach is not restricted only to multi-directional optical cloaking but can also be applied to different cloaking scenarios dealing with electromagnetic waves at nanoscales as well as other types such as acoustic waves. Using nanotechnology, our scale proof-of-concept research will take the next step toward the creation of “optical cloaking” devices.

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Section: Design Steps and Numerical Resultsmentioning

confidence: 99%

Section: Further Discussion: the Concept Of Multi-directional Cloakingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Multi-Directional Cloak Design by All-Dielectric Unit-Cell Optimized Structure

et al. 2022

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“…[ 18 ] In another study, the genetic algorithm optimization has been utilized to cloak a perfect electric conductor cylinder by cancellation of undesired scatterings at microwave range, theoretically and experimentally. [ 19 ] Self‐cloaking of any arbitrary sized and shaped objects not requiring external cloak in specified frequency bandwidth (BW) and particular direction has been regarded in. [ 20 ] Index profile tailoring has been carried out to cancel scatterings and restores the original wavefront on the other side of the cloaked object.…”

Section: Introductionmentioning

confidence: 99%

All‐Angle Self‐Collimation‐Based Invisibility Cloaking in 2D Square Lattice Photonic Crystals

Karimpour

Noori

2020

Annalen der Physik

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Here, a two-dimensional (2D) hole-type square lattice photonic crystal is shown to achieve invisibility cloaking based on all-angle self-collimation. The proposed structure, which is composed of the high-refraction-index dielectric material PbTe (n PbTe ≈ 6), is applicable in the mid-infrared (mid-IR) frequency range. The cloaking region is capable of hiding any object of any shape and size since the incoming wave does not interact with the cloaked object. The optimization process and the functionality of the proposed structure are investigated by equal frequency contour analysis and the finite difference time domain (FDTD) method.

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“…Recently, an interesting approach based on metamaterials and optical neutrality was proposed to provide invisibility without evoking cloaking [18]. Last, but not least, the idea of using the optimization approach to obtain the cloaking effect shows promising results [19][20][21][22]. Here, the optimization methods search for possible designs of cloaking structures in accordance with a specific objective function.…”

Section: Introductionmentioning

confidence: 99%

Analytical, numerical, and experimental investigation of a Luneburg lens system for directional cloaking

et al. 2019

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In this study, the design of a directional cloaking based on the Luneburg lens system is proposed and its operating principle is experimentally verified. The cloaking concept is analytically investigated via geometrical optics and numerically realized with the help of the finite-difference time-domain method. In order to benefit from its unique focusing and/or collimating characteristics of light, the Luneburg lens is used. We show that by the proper combination of Luneburg lenses in an array form, incident light bypasses the region between junctions of the lenses, i.e., the "dark zone." Hence, direct interaction of an object with propagating light is prevented if one places the object to be cloaked inside that dark zone. This effect is used for hiding an object which is made of a perfectly electric conductor material. In order to design an implementable cloaking device, the Luneburg lens is discretized into a photonic crystal structure having gradually varying air cylindrical holes in a dielectric material by using Maxwell Garnett effective medium approximations. Experimental verifications of the designed cloaking structure are performed at microwave frequencies of around 8 GHz. The proposed structure is fabricated by three-dimensional printing of dielectric polylactide material and a brass metallic alloy is utilized in place of the perfectly electric conductor material in microwave experiments. Good agreement between numerical and experimental results is found.

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Directional invisibility by genetic optimization

Cited by 20 publications

References 24 publications

Multi-Directional Cloak Design by All-Dielectric Unit-Cell Optimized Structure

Multi-Directional Cloak Design by All-Dielectric Unit-Cell Optimized Structure

All‐Angle Self‐Collimation‐Based Invisibility Cloaking in 2D Square Lattice Photonic Crystals

Analytical, numerical, and experimental investigation of a Luneburg lens system for directional cloaking

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