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

The simulated electric-field distributions.(a) The simulation results of a metallic cylinder. (b) The simulation results of a metallic cylinder enclosed by a transformed lens. (c) The simulation results of a Luneburg lens. (d) The simulated wave behaviors of a transformed lens at 100 GHz, which mimic some properties of the Einstein gravitational lens.
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f4: The simulated electric-field distributions.(a) The simulation results of a metallic cylinder. (b) The simulation results of a metallic cylinder enclosed by a transformed lens. (c) The simulation results of a Luneburg lens. (d) The simulated wave behaviors of a transformed lens at 100 GHz, which mimic some properties of the Einstein gravitational lens.

Mentions: To verify the idea of this transformation lens, numerical simulations have been done by the aid of commercial software package COMSOL Multiphysics. The working frequency is chosen as f0 = 10 GHz. The radius of the center metallic cylinder is r1 = 30 mm, and the outer radius of the transformed lens r2 = 60 mm. The focal length is chosen as af = r2. Plane waves incident to a metallic cylinder without the transformed lens will be reflected and a shadow is observed in forward direction as shown in Fig. 4(a). After the metallic cylinder is enclosed by transformed lens, the waves will be redirected and then propagate around the metallic cylinder smoothly inside the lens, and finally focus on one spot when leaving the lens, as shown in Fig. 4(b). As a comparison, we plot the electric-field distributions of the original Luneburg lens in Fig. 4(c). It is easy to find that the field distributions outside the transformed lens and Luneburg lens are exactly the same (Fig. 4(b,c)), which verifies the theory of the transformed lens.


Transmitting information of an object behind the obstacle to infinity.

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

The simulated electric-field distributions.(a) The simulation results of a metallic cylinder. (b) The simulation results of a metallic cylinder enclosed by a transformed lens. (c) The simulation results of a Luneburg lens. (d) The simulated wave behaviors of a transformed lens at 100 GHz, which mimic some properties of the Einstein gravitational lens.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f4: The simulated electric-field distributions.(a) The simulation results of a metallic cylinder. (b) The simulation results of a metallic cylinder enclosed by a transformed lens. (c) The simulation results of a Luneburg lens. (d) The simulated wave behaviors of a transformed lens at 100 GHz, which mimic some properties of the Einstein gravitational lens.
Mentions: To verify the idea of this transformation lens, numerical simulations have been done by the aid of commercial software package COMSOL Multiphysics. The working frequency is chosen as f0 = 10 GHz. The radius of the center metallic cylinder is r1 = 30 mm, and the outer radius of the transformed lens r2 = 60 mm. The focal length is chosen as af = r2. Plane waves incident to a metallic cylinder without the transformed lens will be reflected and a shadow is observed in forward direction as shown in Fig. 4(a). After the metallic cylinder is enclosed by transformed lens, the waves will be redirected and then propagate around the metallic cylinder smoothly inside the lens, and finally focus on one spot when leaving the lens, as shown in Fig. 4(b). As a comparison, we plot the electric-field distributions of the original Luneburg lens in Fig. 4(c). It is easy to find that the field distributions outside the transformed lens and Luneburg lens are exactly the same (Fig. 4(b,c)), which verifies the theory of the transformed lens.

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