Active Exterior Cloaking
نویسندگان
چکیده
A new method of cloaking is presented. For two-dimensional quasistatics it is proven how a single active exterior cloaking device can be used to shield an object from surrounding fields, yet produce very small scattered fields. The problem is reduced to finding a polynomial which is approximately one within one disk and zero within a second disk, and such a polynomial is constructed. For the two-dimensional Helmholtz equation, it is numerically shown that three active exterior devices placed around the object suffice to produce very good cloaking.
منابع مشابه
Broadband exterior cloaking.
It is shown how a recently proposed method of cloaking is effective over a broad range of frequencies. The method is based on three or more active devices. The devices, while not radiating significantly, create a "quiet zone" between the devices where the wave amplitude is small. Objects placed within this region are virtually invisible. The cloaking is demonstrated by simulations with a broadb...
متن کاملDifferential Form Approach to the Analysis of Electromagnetic Cloaking and Masking
We discuss the relationship between (a) electromagnetic masking or cloaking of objects produced by some metamaterial blueprints and (b) some invariances of Maxwell equations obviated by means of differential forms (exterior calculus). © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2051–2053, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mo...
متن کاملAcoustic and electromagnetic cloaking
In this talk, we shall present our recent progress on acoustic and electromagnetic cloaking of obstacles with transformation media. In wave scattering, an obstacle is an object that waves cannot penetrate inside. With artificially designed transformation media, we show that the obstacle can be virtually reshaped under acoustic or electromagnetic wave detection. These cloaking media are shown to...
متن کاملCloaking a sensor via transformation optics.
Ideal transformation optics cloaking at positive frequency, besides rendering the cloaked region invisible to detection by scattering of incident waves, also shields the region from those same waves. In contrast, we demonstrate that approximate cloaking permits a strong coupling between the cloaked and uncloaked regions; careful choice of parameters allows this coupling to be amplified, leading...
متن کامل