Zilberti Scientific Reports They were published on May 25,in the same issue of Sciencea peer reviewed journal. metamateriala Elastic metamaterials with simultaneously negative effective shear modulus and mass density. Broadband electromagnetic cloaking with smart metamaterials. Metamaterials are artificial structures composed of periodic or nonperiodic subwavelength unit cells, which have powerful abilities to tailor electromagnetic (EM) waves in unusual ways. Broadband electromagnetic cloaking with smart metamaterials. Invisibility devices demonstrated so far typically comprise a rigid structure wrapped around an object to which it is fitted. This method was first understood with electromagnetic cloaking metamaterials - the electromagnetic energy is in effect directed around an object, or hole, and protecting buildings from seismic waves employs this same principle. Superlenses from Metamaterials The best optical lens-based imaging systems, assuming the absence of … Electromagnetic cloaking with metamaterials Pekka Alitalo, Sergei Tretyakov Research output : Contribution to journal › Article › Scientific › peer-review cloaking, metamaterials, plasmonics, transparency, invisibility Comments ... Electromagnetic Cloaking: Background and Physical Remarks Making an object electromagnetically “invisible” to the impinging radiation is a topic of quite old debate in the technical literature. This approach leads to low-loss, broadband performance in the visible frequency range, which is difficult to achieve by other means. Copper loops for those metamaterials would have to be about 40 nanometers to 70 nanometers long. The guiding vision for the metamaterial cloak is a device that directs the flow of light smoothly around an object, like water flowing past a rock in a stream, without reflection , rendering the … The ability to render objects invisible with a cloak that fits all objects and sizes is a long-standing goal for optical devices. Because certain metamaterials can control electromagnetic waves, ... “After we did the cloaking, my feeling was that [we] couldn’t do more in academics,” says Prof Smith. The conserved fields—electric displacement field D , magnetic induction field B , and Poynting vector B —are all displaced in a consistent manner. Broadband electromagnetic cloaking with smart metamaterials Published in: Nature Communications, November 2012 DOI: 10.1038/ncomms2219: Pubmed ID: 23169054. The first electromagnetic cloak. That's what makes metamaterials so ideal for cloaking applications—any "invisibility cloak" must be able to bend electromagnetic waves around whatever it's supposed to be cloaking. 1 - 5 The effective permittivity and permeability can be tailored to reach the values beyond possible in nature. The role metamaterials can play in optical cloaking with their uncommon electromagnetic properties is only one of many metamaterial applications. Cloaking from electromagnetic fields with transmission-line networks. Artificially structured metamaterials have enabled unprecedented flexibility in manipulating electromagnetic waves and producing new functionalities, including the cloak of invisibility based on coordinate transformation. Materials and Smart Structures / Broadband electromagnetic cloaking . The first electromagnetic cloaking device was produced in 2006, using gradient-index metamaterials.This has led to the burgeoning field of transformation optics (and now transformation acoustics), where the propagation of waves is precisely manipulated by controlling the behaviour of the material through which the light (sound) is travelling. dielectric or metallic cylinders or spheres) from the electromagnetic fields that exist in the medium that surrounds the object. Electromagnetic metamaterials are widely studied in the literature, and in the last decade several structures have been proposed with characteristics beyond those of natural media. }, author={Dongheok Shin and Y. Urzhumov and Y. Jung and Gumin Kang and Seunghwa Baek and M. Choi and Haesung Park and K. Kim and D. Smith}, journal={Nature communications}, … Broadband electromagnetic cloaking with smart metamaterials. 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