Limits...
Transmitting information of an object behind the obstacle to infinity.

Xu BB, Jiang WX, Meng LL, Cui TJ - Sci Rep (2015)

Bottom Line: We propose an illusion device that transforms a metallic cylinder into a Luneburg lens by using transformation optics.In order to realize the required-anisotropic parameters with high permittivity and low permeability, we design embedded split-ring resonators (SRRs) to increase the permittivity of the traditional SRR structures.In experiments, we fabricate and measure the transformed lens, and the tested results agree well with the numerical simulations and theoretical predictions.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Millimeter Waves, Department of Radio Engineering, Southeast University, Nanjing 210096, China.

ABSTRACT
We propose an illusion device that transforms a metallic cylinder into a Luneburg lens by using transformation optics. Such a transformed focusing lens guides electromagnetic waves to propagate around the central metallic cylinder smoothly and be focused on one spot, and thus the information of an object behind the obstacle can be transmitted to infinity. In order to realize the required-anisotropic parameters with high permittivity and low permeability, we design embedded split-ring resonators (SRRs) to increase the permittivity of the traditional SRR structures. In experiments, we fabricate and measure the transformed lens, and the tested results agree well with the numerical simulations and theoretical predictions. The proposed transformation lens can mimic some properties of Einstein gravitational lens because their wave propagation behaviors are very similar.

No MeSH data available.


Related in: MedlinePlus

Illustration of transformed Luneburg lens.(a) When an obstacle is placed on the front of the eye, we cannot see anything behind the obstacle. (b) When the obstacle is enclosed by a dielectric lens, the things behind the obstacle can be observed. (c) Physical space. (d) Virtual space.
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f1: Illustration of transformed Luneburg lens.(a) When an obstacle is placed on the front of the eye, we cannot see anything behind the obstacle. (b) When the obstacle is enclosed by a dielectric lens, the things behind the obstacle can be observed. (c) Physical space. (d) Virtual space.

Mentions: In real life, people may wonder whether we can see something behind an obstacle. Apparently, the answer is no, as shown in Fig. 1(a). However, if the obstacle is enclosed by a dielectric lens as illustrated in Fig. 1(b), things may happen in the other way. To make the object behind an obstacle visible, we take advantage of the super properties of inhomogeneous and anisotropic metamaterials to design a transformed lens, the principle of which can be found in Fig. 1(c,d). In the physical space, a metallic cylinder is enclosed by a transformed lens as shown in Fig. 1(c). Waves will be reflected once they access the surface of the metallic cylinder. However, when the metallic cylinder is enclosed by a circular-ring lens with inner radius r1 and outer radius r2, we expect that the waves will be guided and then propagate around the metallic cylinder. To design such a functional device by using the technique of transformation optics, an inhomogeneous cylindrical lens, Luneburg lens, exists in the virtual space, as shown in Fig. 1(d). Assume the distance between the center and focal point is af (namely the focal length). Then the material parameter of the lens with radius r2 is described as


Transmitting information of an object behind the obstacle to infinity.

Xu BB, Jiang WX, Meng LL, Cui TJ - Sci Rep (2015)

Illustration of transformed Luneburg lens.(a) When an obstacle is placed on the front of the eye, we cannot see anything behind the obstacle. (b) When the obstacle is enclosed by a dielectric lens, the things behind the obstacle can be observed. (c) Physical space. (d) Virtual space.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4536636&req=5

f1: Illustration of transformed Luneburg lens.(a) When an obstacle is placed on the front of the eye, we cannot see anything behind the obstacle. (b) When the obstacle is enclosed by a dielectric lens, the things behind the obstacle can be observed. (c) Physical space. (d) Virtual space.
Mentions: In real life, people may wonder whether we can see something behind an obstacle. Apparently, the answer is no, as shown in Fig. 1(a). However, if the obstacle is enclosed by a dielectric lens as illustrated in Fig. 1(b), things may happen in the other way. To make the object behind an obstacle visible, we take advantage of the super properties of inhomogeneous and anisotropic metamaterials to design a transformed lens, the principle of which can be found in Fig. 1(c,d). In the physical space, a metallic cylinder is enclosed by a transformed lens as shown in Fig. 1(c). Waves will be reflected once they access the surface of the metallic cylinder. However, when the metallic cylinder is enclosed by a circular-ring lens with inner radius r1 and outer radius r2, we expect that the waves will be guided and then propagate around the metallic cylinder. To design such a functional device by using the technique of transformation optics, an inhomogeneous cylindrical lens, Luneburg lens, exists in the virtual space, as shown in Fig. 1(d). Assume the distance between the center and focal point is af (namely the focal length). Then the material parameter of the lens with radius r2 is described as

Bottom Line: We propose an illusion device that transforms a metallic cylinder into a Luneburg lens by using transformation optics.In order to realize the required-anisotropic parameters with high permittivity and low permeability, we design embedded split-ring resonators (SRRs) to increase the permittivity of the traditional SRR structures.In experiments, we fabricate and measure the transformed lens, and the tested results agree well with the numerical simulations and theoretical predictions.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Millimeter Waves, Department of Radio Engineering, Southeast University, Nanjing 210096, China.

ABSTRACT
We propose an illusion device that transforms a metallic cylinder into a Luneburg lens by using transformation optics. Such a transformed focusing lens guides electromagnetic waves to propagate around the central metallic cylinder smoothly and be focused on one spot, and thus the information of an object behind the obstacle can be transmitted to infinity. In order to realize the required-anisotropic parameters with high permittivity and low permeability, we design embedded split-ring resonators (SRRs) to increase the permittivity of the traditional SRR structures. In experiments, we fabricate and measure the transformed lens, and the tested results agree well with the numerical simulations and theoretical predictions. The proposed transformation lens can mimic some properties of Einstein gravitational lens because their wave propagation behaviors are very similar.

No MeSH data available.


Related in: MedlinePlus