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June 24, 2010

An infrared invisibility cloak composed of glass

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The design of the invisibility cloak consists of a spoke-like configuration of glass resonators, which form a magnetic resonance that is used to obtain the desired parameters of the medium. The illustration shows the glass cloak designed to hide a metal cylinder of 15 micrometers in diameter. Image credit: Semouchkina, et al.

Michigan and Pennsylvania researchers are going to make an infrared invisibility cloak out of glass.

We propose to implement a nonmetallic low-loss cloak for the infrared range from identical chalcogenide glass resonators. Based on transformation optics for cylindrical objects, our approach does not require metamaterial response to be homogeneous and accounts for the discrete nature of elementary responses governed by resonator shape, illumination angle, and inter-resonator coupling. Air fractions are employed to obtain the desired distribution of the cloak effective parameters. The effect of cloaking is verified by full-wave simulations of the true multiresonator structure. The feasibility of cloak fabrication is demonstrated by prototyping glass grating structures with the dimensions characteristic for the cloak resonators.



Physorg has coverage of this more reliable invisibility cloak

* This is a non-metallic low-loss all-dielectric cloak.
* cloak is based on the magnetic resonance in dielectric resonators
* Unlike previous designs, this design has careful control of interactions between resonators, since a true multi-resonator structure has been simulated. It makes the design essentially more reliable
* proposed cloak consists of identical nanosized chalcogenide glass resonators arranged in a concentric pattern. In simulations, the researchers found that glass resonators in the shape of a cylinder with a diameter of 300 nm and a height of 150 nm provided the best results for the light wavelength of 1 micron


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