Cloaking device

Simulation of how a cloaking device would work. Cloaking device deactivated: Light is reflected and absorbed by the object, causing it to be visible
Simulation of how a cloaking device would work. Cloaking device active: Light is deflected around the object, causing it to be invisible

A cloaking device is a theoretical or fictional stealth technology that can cause objects, such as spaceships or individuals, to be partially or wholly invisible to parts of the electromagnetic (EM) spectrum. However, over the entire spectrum, a cloaked object scatters more than an uncloaked object.[1]

Fictional cloaking devices have been used as plot devices in various media for many years.

Developments in scientific research show that real-world cloaking devices can obscure objects from at least one wavelength of EM emissions. Scientists already use artificial materials called metamaterials to bend light around an object.[2]

Conceptual origins

Inspired in part by the 1958 film Run Silent, Run Deep, Star Trek screenwriter Paul Schneider imagined cloaking as a space-travel analog of a submarine submerging, and employed it in the 1966 Star Trek episode "Balance of Terror". Another Star Trek screenwriter, D.C. Fontana, coined the term cloaking device for the 1968 episode "The Enterprise Incident".

Writers and game designers have since incorporated cloaking devices into many other science-fiction narratives, including Doctor Who, Star Wars, and Stargate.

Scientific experimentation

An operational, non-fictional cloaking device might be an extension of the basic technologies used by stealth aircraft, such as radar-absorbing dark paint, optical camouflage, cooling the outer surface to minimize electromagnetic emissions (usually infrared), or other techniques to minimize other EM emissions, and to minimize particle emissions from the object. The use of certain devices to jam and confuse remote sensing devices would greatly aid in this process, but are more properly referred to as "active camouflage". Alternatively, metamaterials provide the theoretical possibility of making electromagnetic radiation pass freely around the 'cloaked' object.[3]

Metamaterial research

Main article: Metamaterial cloaking

Optical metamaterials have featured in several recent proposals for invisibility schemes. "Metamaterials" refers to materials that owe their refractive properties to the way they are structured, rather than the substances that compose them. Using transformation optics it is possible to design the optical parameters of a "cloak" so that it guides light around some region, rendering it invisible over a certain band of wavelengths. These spatially varying optical parameters do not correspond to any natural material, but may be implemented using metamaterials. There are several theories of cloaking, giving rise to different types of invisibility.

In 2014, scientists demonstrated good cloaking performance in murky water, demonstrating that an object shrouded in fog can disappear completely when appropriately coated with metamaterial. This is due to the random scattering of light, such as that which occurs in clouds, fog, milk, frosted glass, etc., combined with the properties of the metamaterial coating. When light is diffused, a thin coat of metamaterial around an object can make it essentially invisible under a range of lighting conditions.[4][5]

Active camouflage

Main article: Active camouflage
A cloak using optical camouflage by Susumu Tachi. Left: The cloth seen without a special device. Right: The same cloth seen though the half-mirror projector part of the Retro-Reflective Projection Technology.

Active camouflage (or adaptive camouflage) is a group of camouflage technologies which would allow an object (usually military in nature) to blend into its surroundings by use of panels or coatings capable of changing color or luminosity. Active camouflage can be seen as having the potential to become the perfection of the art of camouflaging things from visual detection.

Optical camouflage is a kind of active camouflage in which one wears a fabric which has an image of the scene directly behind the wearer projected onto it, so that the wearer appears invisible. The drawback to this system is that, when the cloaked wearer moves, a visible distortion is often generated as the 'fabric' catches up with the object's motion. The concept exists for now only in theory and in proof-of-concept prototypes, although many experts consider it technically feasible.

It has been reported that the British Army has tested an invisible tank.[6][7] Mercedes demonstrated an invisible car using LED and camera in 2012.[8]

Plasma stealth

Main article: Plasma stealth

Plasma at certain density ranges absorbs certain bandwidths of broadband waves, potentially rendering an object invisible. However, generating plasma in air is too expensive and a feasible alternative is generating plasma between thin membranes instead.[9] The Defense Technical Information Center is also following up research on plasma reducing RCS technologies.[10] A plasma cloaking device was patented in 1991.[11]

Metascreen

A prototype Metascreen is a claimed cloaking device, which is just few micrometers thick and to a limited extent can hide 3D objects from microwaves in their natural environment, in their natural positions, in all directions, and from all of the observer's positions. It was prepared at the University of Texas, Austin by Professor Andrea Alù.[12][13]

The metascreen consisted of a 66 micrometre thick polycarbonate film supporting an arrangement of 20 micrometer thick copper strips that resembled a fishing net. In the experiment, when the metascreen was hit by 3.6 GHz microwaves, it re-radiated microwaves of the same frequency that were out of phase, thus cancelling out reflections from the object being hidden.[13] The device only cancelled out the scattering of microwaves in the first order.[13] The same researchers published a paper on "plasmonic cloaking" the previous year.[14]

Howell/Choi cloaking device

University of Rochester physics professor John Howell and graduate student Joseph Choi have announced a scalable cloaking device which uses common optical lenses to achieve visible light cloaking on the macroscopic scale, known as the "Rochester Cloak". The device consists of a series of four lenses which direct light rays around objects which would otherwise occlude the optical pathway.[15]

Cloaking in Mechanics

The concepts of cloaking are not limited to optics but can also be transferred to other fields of Physics. For example it was possible to cloak acoustics for certain frequency's as well as touching in mechanics. This renders an object "invisible" to sound or even hides it from touching.[16]

See also

References

  1. ↑ "Do cloaked objects shine brightly?".
  2. ↑ Sledge, Gary. "Going Where No One Has Gone Before", Discovery Channel Magazine #3. ISSN 1793572-5
  3. ↑ Service, Robert F.; Cho, Adrian (17 December 2010). "Strange New Tricks With Light". Science 330 (6011): 1622. Bibcode:2010Sci...330.1622S. doi:10.1126/science.330.6011.1622. PMID 21163994.
  4. ↑ Smith, David R. (25 July 2014). "A cloaking coating for murky media". Science 345: 384. doi:10.1126/science.1256753.
  5. ↑ Schittny, Robert et cl. (25 July 2014). "Invisibility cloaking in a diffuse light scattering medium". Science 345: 427. doi:10.1126/science.1254524.
  6. ↑ "Army tests James Bond style tank that is 'invisible'". Daily Mail (London). 30 October 2007.
  7. ↑ Clark, Josh. "Is the army testing an invisible tank?", HowStuffWorks.com, 3 December 2007. accessed 22 February 2012.
  8. ↑ "Gone in less than 60 seconds! Engineers use LEDs and a camera to create an 'invisible' Mercedes (but they might need to work on the wheels)". Daily Mail (London).
  9. ↑ Plasma cloaking: Air chemistry, broadband absorption, and plasma generation backup, February 1990.
  10. ↑ Gregoire, D. J. ; Santoru, J. ; Schumacher, R. W.Abstract Electromagnetic-Wave Propagation in Unmagnetized Plasmas, March 1992.
  11. ↑ Roth, John R. "Microwave absorption system" U.S. Patent 4,989,006
  12. ↑ "Invisibility cloaks are almost a reality after scientists invent ultra-thin material that hides objects from microwaves". Daily Mail (London). 25 March 2013.
  13. ↑ 13.0 13.1 13.2 Tim Wogan (28 March 2013). "Ultrathin "metascreen" forms latest invisibility cloak". PhysicsWorld.com.
  14. ↑ http://iopscience.iop.org/1367-2630 New Journal of Physics, March 2013.
  15. ↑ "Cloaking' device uses ordinary lenses to hide objects across range of angles". Science Daily. Science Daily. 29 September 2014. Retrieved 29 September 2014.
  16. ↑ Bückmann, Tiemo (2014). "An elasto-mechanical unfeelability cloak made of pentamode metamaterials". Nature Communications 5 (4130). doi:10.1038/ncomms5130.

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