The size of the objects that can be efficiently cloaked
with this method scales with the wavelength of operation, so when applied to optical frequencies, we may be able to efficiently stop the scattering of micrometer-sized objects," Alu said.
antibodies can be used alone, or in conjunction with the many antibodies already produced against a wide variety of cancers.
Furthermore the 'perfect cloak' has to have a huge superstructure of two different sets of mirrors and is more than twice as wide as the region being cloaked
Though heat isn't completely blocked, but only slowed, from dissipating into the cloaked
area, Guenneau says there are potential applications for preventing materials from heating up too fast.
While previous studies have either been theoretical in nature or limited to the cloaking of two-dimensional objects, this new study by US researchers shows how ordinary objects can be cloaked
in their natural environment in all directions and from all of an observer's positions.
The holes must be smaller than the wavelength of the light--mere tens of nanometers across for visible light, the shortest wavelengths cloaked
The layers surround the object to be cloaked
like an onion skin.
Although the study cloaked
a microscopic object roughly the diameter of a red blood cell, the device demonstrates that it may be "capable of cloaking any object underneath a reflective carpet layer.
But charged particles wouldn't be fooled: They would interact with the cloak in a telltale way, giving up the cloaked
object's location, researchers report in a paper to appear in Physical Review Letters.
The group showed that both the physical geometry and the spectrographic signature of a chemical strip about the width of 10 human hairs disappeared when cloaked
After we placed the cloaked
structure around the object we wanted to hide, the scattering or shadow effect was greatly reduced," Fang said.
Unlike the atoms and molecules that nature provides, which are limited in the combinations of electrical and magnetic permittivity and permeability, the novel metamaterials can mix and match E and g to provide exactly the radical refractive index variations that make light do loop-de-loops around a cloaked
void, while obeying rules that would otherwise produce a straight route.
Until now, however, cloaking techniques have come with a significant limitation--they need to be orders of magnitude larger than the object being cloaked
They have cloaked
metal cylinders two to three inches in diameter and three to four inches high.
The key is that electromagnetic waves still enter the cloaked
area and hit the object--a requirement for an antenna to pick up a signal, for example.