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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.


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The details of embedded unit cells and effective material parameters.(a) The unit cell. (b) The effective material parameters of the eighth layer. (c) The illustration of transformed lens.
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f3: The details of embedded unit cells and effective material parameters.(a) The unit cell. (b) The effective material parameters of the eighth layer. (c) The illustration of transformed lens.

Mentions: From the aforementioned discussion, the permeability of the transformed lens is below 1 and we know that SRR structure is such a magnetic resonator that can achieve low permeability. Nevertheless, the conventional SRR cannot satisfy the required high permittivity. Hence, we present a new embedded SRR to implement the above constitutive materials. Figure 3(a) gives the design in which the metallic SRR structure is embedded in the center of the dielectric cuboid with permittivity of 2.65. For the geometry, ts is the thickness of one-layer medium and ax, az are the length and width of the unit cell respectively. dx, dz are the length of metallic structure SRR with respect to x and z directions. h1 is the height of split gap of SRR and w is the line width of metallic structure. The thickness of metallic SRR structure is 0.035 mm, much less than that of the dielectric cuboid. The effective medium parameters of the embedded SRR structure in the eighth layer are shown in Fig. 3(b). We can find that the geometry parameters dx, dz shift the frequency of electric resonance while h1 shifts the frequency of magnetic resonance. As a result, the electromagnetic parameters in other layers can be obtained by adjusting the geometry parameters dx, dz and h1 at certain frequency.


Transmitting information of an object behind the obstacle to infinity.

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

The details of embedded unit cells and effective material parameters.(a) The unit cell. (b) The effective material parameters of the eighth layer. (c) The illustration of transformed lens.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f3: The details of embedded unit cells and effective material parameters.(a) The unit cell. (b) The effective material parameters of the eighth layer. (c) The illustration of transformed lens.
Mentions: From the aforementioned discussion, the permeability of the transformed lens is below 1 and we know that SRR structure is such a magnetic resonator that can achieve low permeability. Nevertheless, the conventional SRR cannot satisfy the required high permittivity. Hence, we present a new embedded SRR to implement the above constitutive materials. Figure 3(a) gives the design in which the metallic SRR structure is embedded in the center of the dielectric cuboid with permittivity of 2.65. For the geometry, ts is the thickness of one-layer medium and ax, az are the length and width of the unit cell respectively. dx, dz are the length of metallic structure SRR with respect to x and z directions. h1 is the height of split gap of SRR and w is the line width of metallic structure. The thickness of metallic SRR structure is 0.035 mm, much less than that of the dielectric cuboid. The effective medium parameters of the embedded SRR structure in the eighth layer are shown in Fig. 3(b). We can find that the geometry parameters dx, dz shift the frequency of electric resonance while h1 shifts the frequency of magnetic resonance. As a result, the electromagnetic parameters in other layers can be obtained by adjusting the geometry parameters dx, dz and h1 at certain frequency.

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