RAS’s Cloak of Invincibility Slips at Last?
نویسندگان
چکیده
منابع مشابه
Cloak/anti-cloak interactions.
Coordinate-transformation cloaking is based on the design of a metamaterial shell made of an anisotropic, spatially inhomogeneous "transformation medium" that allows rerouting the impinging wave around a given region of space. In its original version, it is generally believed that, in the ideal limit, the radiation cannot penetrate the cloaking shell (from outside to inside, and viceversa). How...
متن کاملMetamaterial electromagnetic cloak at microwave frequencies.
A recently published theory has suggested that a cloak of invisibility is in principle possible, at least over a narrow frequency band. We describe here the first practical realization of such a cloak; in our demonstration, a copper cylinder was "hidden" inside a cloak constructed according to the previous theoretical prescription. The cloak was constructed with the use of artificially structur...
متن کاملSilicon nanostructure cloak operating at optical frequencies
The ability to render objects invisible using a cloak (such that they are not detectable by an external observer) has long been a tantalizing goal1–6. Here, we demonstrate a cloak operating in the near infrared at a wavelength of 1,550 nm. The cloak conceals a deformation on a flat reflecting surface, under which an object can be hidden. The device has an area of 225 mm and hides a region of 1....
متن کاملThree-dimensional invisibility cloak at optical wavelengths.
We have designed and realized a three-dimensional invisibility-cloaking structure operating at optical wavelengths based on transformation optics. Our blueprint uses a woodpile photonic crystal with a tailored polymer filling fraction to hide a bump in a gold reflector. We fabricated structures and controls by direct laser writing and characterized them by simultaneous high-numerical-aperture, ...
متن کاملAt most at last
Recent pragmatic accounts derive the ignorance inferences to which superlative modifiers give rise as quantity implicatures in a neo-Gricean framework. While these approaches successfully account for the interaction of at least with modals, the behavior of at most remains a puzzle. I propose that at most is composed of an antonymizing operator and at least and show how this accounts for the int...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Cancer Cell
سال: 2014
ISSN: 1535-6108
DOI: 10.1016/j.ccr.2013.12.016