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• W2904995044 abstract "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." @default.
• W2904995044 created "2018-12-22" @default.
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• W2904995044 date "2019-04-23" @default.
• W2904995044 modified "2023-10-16" @default.
• W2904995044 title "Analytical, numerical, and experimental investigation of a Luneburg lens system for directional cloaking" @default.
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• W2904995044 doi "https://doi.org/10.1103/physreva.99.043831" @default.
• W2904995044 hasPublicationYear "2019" @default.
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