کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1900747 | 1045370 | 2011 | 13 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Analytical study of spherical cloak/anti-cloak interactions Analytical study of spherical cloak/anti-cloak interactions](/preview/png/1900747.png)
The intriguing concept of “anti-cloaking” has been recently introduced within the framework of transformation optics (TO), first as a “countermeasure” to invisibility-cloaking (i.e., to restore the scattering response of a cloaked target), and more recently in connection with “sensor invisibility” (i.e., to strongly reduce the scattering response while maintaining the field-sensing capabilities). In this paper, we extend our previous studies, which were limited to a two-dimensional cylindrical scenario, to the three-dimensional spherical case. More specifically, via a generalized (coordinate-mapped) Mie-series approach, we derive a general analytical full-wave solution pertaining to plane-wave-excited configurations featuring a spherical object surrounded by a TO-based invisibility cloak coupled via a vacuum layer to an anti-cloak, and explore the various interactions of interest. With a number of selected examples, we illustrate the cloaking and field-restoring capabilities of various configurations, highlighting similarities and differences with respect to the cylindrical case, with special emphasis on sensor-cloaking scenarios and ideas for approximate implementations that require the use of double-positive media only.
Research highlights
► Anti-cloaking may totally or partially compensate cloaking effects.
► Possible applications include cloaking countermeasures and invisible sensors.
► We analytically study cloak/anti-cloak interactions in a spherical geometry.
► We assess the tradeoff between cloaking and field-restoration/absorption.
► We derive simplified implementations based on simple double-positive media.
Journal: Wave Motion - Volume 48, Issue 6, September 2011, Pages 455–467