Phys.org March 27, 2019 An international team of researchers (China, Singapore) used a negative resistor network with active elements to achieve the remote function of the DC cloak. Based on this network, the cloak can remotely generate a hidden region without distorting the currents far from the cloaked region. The experimental results show that any object in the hidden region is invisible to a DC detector. The cloak does not require any knowledge of the hidden object. The cloaking device may find potential applications in medical or geologic research…read more. Open Access TECHNICAL ARTICLE
Category Archives: Cloaking
New technique to make objects invisible proposed
Eurekalert November 26, 2018 Most of the techniques for cloaking harness the extraordinary properties of certain materials to make light circumvent the object to be made invisible. An international team of researchers (Spain, Italy) has developed a technique using the electromagnetic properties of specific materials which can make certain objects invisible when they are introduced as fillers. This plasmonic cloaking makes the object and the filler jointly invisible. The method makes it possible to achieve invisibility from the interior of an object without using any external device and allows the object to interact with its environment without being hampered by […]
Spectral cloaking could make objects invisible under realistic conditions
Phys.org June 28, 2018 Most current cloaking devices can fully conceal the object of interest only when the object is illuminated with just one color of light. Researchers in Canada propose a new conceptual approach enabling the realization of full-field broadband invisibility. This involves a customized and reversible redistribution of the illumination frequency content, allowing the wave to propagate through the object of interest while preventing any interaction between the wave and the object. They demonstrated the concealment of a broadband optical filter from detection with a phase-coherent light pulse of 500 GHz bandwidth, showing full restoration of the complex […]
Cloaking devices — it’s not just ‘Star Trek’ anymore
Eurekalert May 10, 2018 Researchers at Pennsylvania State University have designed material to redirect approaching waves around an object without scattering the wave energy, concealing the object from the sound waves. They designed a 3-foot-tall pyramid out of perforated steel plates and placed the structure on the floor of a large underwater research tank. Inside the tank, a source hydrophone produced acoustic waves between 7,000 Hz and 12,000 Hz, several receiver hydrophones around the tank monitoring reflected acoustic waves. The wave reflected from the metamaterial matched the phase of the reflected wave from the surface demonstrating that the material could […]