Cloaking device: Difference between revisions
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{{Short description|Theoretical device to render objects invisible}} | {{Short description|Theoretical device to render objects invisible}} | ||
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| | |article-number = 041005 | ||
|doi = 10.1103/PhysRevX.3.041005 | |doi = 10.1103/PhysRevX.3.041005 | ||
|arxiv = 1307.3996 |bibcode = 2013PhRvX...3d1005M |s2cid = 118637398 | |arxiv = 1307.3996 |bibcode = 2013PhRvX...3d1005M |s2cid = 118637398 | ||
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Cloaks with magical powers of invisibility appear from the earliest days of story-telling. Since the advent of modern [[Science fiction]], many variations on the theme with proposed basis in reality have been imagined. ''[[Star Trek: The Original Series|Star Trek]]'' screenwriter [[Paul Schneider (writer)|Paul Schneider]], inspired in part by the 1958 film ''[[Run Silent, Run Deep (1958 film)|Run Silent, Run Deep]],'' and in part by ''[[The Enemy Below]],'' which had been released in 1957, imagined cloaking as a space-travel analog of a [[submarine]] submerging, and employed it in the 1966 ''Star Trek'' episode "[[Balance of Terror]]", in which he introduced the [[Romulan]] species, whose space vessels employ cloaking devices extensively. (He likewise predicted, in the same episode, that invisibility, "selective bending of light" as described above, would have an enormous power requirement.) Another ''Star Trek'' screenwriter, [[D.C. Fontana]], coined the term ''"cloaking device"'' for the 1968 episode "[[The Enterprise Incident|The ''Enterprise'' Incident]]", which also featured Romulans. | Cloaks with magical powers of invisibility appear from the earliest days of story-telling. Since the advent of modern [[Science fiction]], many variations on the theme with proposed basis in reality have been imagined. ''[[Star Trek: The Original Series|Star Trek]]'' screenwriter [[Paul Schneider (writer)|Paul Schneider]], inspired in part by the 1958 film ''[[Run Silent, Run Deep (1958 film)|Run Silent, Run Deep]],'' and in part by ''[[The Enemy Below]],'' which had been released in 1957, imagined cloaking as a space-travel analog of a [[submarine]] submerging, and employed it in the 1966 ''Star Trek'' episode "[[Balance of Terror]]", in which he introduced the [[Romulan]] species, whose space vessels employ cloaking devices extensively. (He likewise predicted, in the same episode, that invisibility, "selective bending of light" as described above, would have an enormous power requirement.) Another ''Star Trek'' screenwriter, [[D.C. Fontana]], coined the term ''"cloaking device"'' for the 1968 episode "[[The Enterprise Incident|The ''Enterprise'' Incident]]", which also featured Romulans. | ||
''Star Trek'' placed a limit on use of this device: a space vessel cannot fire weapons, employ defensive [[shields (Star Trek)|shields]], or operate [[transporter (Star Trek)|transporters]] while cloaked;<ref>{{cite book|title=The Star Trek Encyclopedia|url=https://books.google.com/books?id=cbYf2l7gczUC|last1=Okuda|last2=Okuda|first1=Michael|first2=Denise|date=1999| publisher=Simon and Schuster | isbn= | ''Star Trek'' placed a limit on use of this device: a space vessel cannot fire weapons, employ defensive [[shields (Star Trek)|shields]], or operate [[transporter (Star Trek)|transporters]] while cloaked;<ref>{{cite book|title=The Star Trek Encyclopedia|url=https://books.google.com/books?id=cbYf2l7gczUC|last1=Okuda|last2=Okuda|first1=Michael|first2=Denise|date=1999| publisher=Simon and Schuster | isbn=978-1-4516-4688-7 }}</ref> thus it must "decloak" to fire.<ref name=S1Ep9.NYT>{{cite news |newspaper=[[The New York Times]] | ||
|url=https://www.nytimes.com/2017/11/12/arts/television/star-trek-discovery-season-1-episode-9-recap.html | |url=https://www.nytimes.com/2017/11/12/arts/television/star-trek-discovery-season-1-episode-9-recap.html | ||
|title=Star Trek: Discovery, Season 1, Episode 9: Sloppy Showdowns | |title=Star Trek: Discovery, Season 1, Episode 9: Sloppy Showdowns | ||
|quote=The Klingons have to decloak to fire | |quote=The Klingons have to decloak to fire | ||
|author=Sopan Deb |date=November 12, 2017}}</ref> | |author=Sopan Deb |date=November 12, 2017}}</ref> At this point, Trek parted ways with the submarine analogy (subs don't "surface" to launch torpedoes), instead anticipating a significant limitation of Stealth technology: aircraft like the [[Northrop B-2 Spirit|B-2 bomber]] cannot avoid [[Stealth technology#Aircraft|becoming un-stealthy]] during the time their bomb bay doors are open. | ||
Writers and game designers have since incorporated cloaking devices into many other science-fiction narratives, including <!-- Please don't add more pop-culture examples of cloaking devices. This article is about the real-world development, not a crufty list comprising every game they've ever appeared in! A link to this article doesn't necessitate a reciprocal link. -->''[[Doctor Who]]'', ''[[Star Wars]]'', and ''[[Stargate]]''. | Writers and game designers have since incorporated cloaking devices into many other science-fiction narratives, including <!-- Please don't add more pop-culture examples of cloaking devices. This article is about the real-world development, not a crufty list comprising every game they've ever appeared in! A link to this article doesn't necessitate a reciprocal link. -->''[[Doctor Who]]'', ''[[Star Wars]]'', and ''[[Stargate]]''. | ||
==Scientific experimentation== | ==Scientific experimentation== | ||
An operational, [[non-fiction]]al 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 is more properly referred to as "[[active camouflage]]". Alternatively, metamaterials provide the theoretical possibility of making electromagnetic radiation pass freely around the 'cloaked' object.<ref>{{cite journal|first1= Robert F. |last1=Service | first2= Adrian |last2= Cho |title= Strange New Tricks With Light |journal= Science | | An operational, [[non-fiction]]al 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 is more properly referred to as "[[active camouflage]]". Alternatively, metamaterials provide the theoretical possibility of making electromagnetic radiation pass freely around the 'cloaked' object.<ref>{{cite journal|first1= Robert F. |last1=Service | first2= Adrian |last2= Cho |title= Strange New Tricks With Light |journal= Science |page= 1622 |volume= 330 |date= 17 December 2010|bibcode = 2010Sci...330.1622S |doi=10.1126/science.330.6011.1622 |issue=6011 |pmid=21163994}}</ref> | ||
===Metamaterial research=== | ===Metamaterial research=== | ||
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|volume = 10 | |volume = 10 | ||
|issue = 11 | |issue = 11 | ||
| | |article-number = 115019 | ||
|doi = 10.1088/1367-2630/10/11/115019 | |doi = 10.1088/1367-2630/10/11/115019 | ||
|bibcode = 2008NJPh...10k5019L | |bibcode = 2008NJPh...10k5019L | ||
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|volume = 10 | |volume = 10 | ||
|number = 9 | |number = 9 | ||
| | |article-number = 093002 | ||
|url = http://repository.upenn.edu/cgi/viewcontent.cgi?article=1491&context=ese_papers | |url = http://repository.upenn.edu/cgi/viewcontent.cgi?article=1491&context=ese_papers | ||
|doi = 10.1088/1464-4258/10/9/093002 | |doi = 10.1088/1464-4258/10/9/093002 | ||
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''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. | ''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.<ref>Clark, Josh. [http://science.howstuffworks.com/invisible-tank.htm "Is the army testing an invisible tank?"] {{webarchive|url=https://web.archive.org/web/20120301121221/http://science.howstuffworks.com/invisible-tank.htm |date=2012-03-01 }}, ''HowStuffWorks.com'', 3 December 2007. accessed 22 February 2012.</ref> | It has been reported that the [[British Army]] has tested an invisible tank.<ref>Clark, Josh. [http://science.howstuffworks.com/invisible-tank.htm "Is the army testing an invisible tank?"] {{webarchive|url=https://web.archive.org/web/20120301121221/http://science.howstuffworks.com/invisible-tank.htm |date=2012-03-01 }}, ''HowStuffWorks.com'', 3 December 2007. accessed 22 February 2012.</ref> Mercedes demonstrated an invisible car using LED and camera in 2012.<ref>{{Cite news |last=Stern |first=Joanna |date=2012-03-05 |title=Mercedes Invisible Car Is Coming … Sort Of |url=https://abcnews.go.com/blogs/technology/2012/03/mercedes-invisible-car-is-coming-sort-of |access-date=2025-10-29 |work=[[ABC News (United States)|ABC News]]}}</ref> | ||
===Plasma stealth=== | ===Plasma stealth=== | ||
| Line 160: | Line 161: | ||
===Cloaking in mechanics=== | ===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 frequencies as well as touching in mechanics. This renders an object "invisible" to sound or even hides it from touching.<ref>{{ cite journal | last = Bückmann | first = Tiemo | year = 2014 | title = An elasto-mechanical unfeelability cloak made of pentamode metamaterials | journal = [[Nature Communications]] | volume = 5 | issue = 4130 | | 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 frequencies as well as touching in mechanics. This renders an object "invisible" to sound or even hides it from touching.<ref>{{ cite journal | last = Bückmann | first = Tiemo | year = 2014 | title = An elasto-mechanical unfeelability cloak made of pentamode metamaterials | journal = [[Nature Communications]] | volume = 5 | issue = 4130 | page = 4130 | doi = 10.1038/ncomms5130 | pmid = 24942191 | bibcode = 2014NatCo...5.4130B | doi-access = free }}</ref> | ||
==See also== | ==See also== | ||
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{{Reflist|30em}} | {{Reflist|30em}} | ||
{{refbegin}} | {{refbegin}} | ||
* {{ cite news |title= Experts test cloaking technology |work= [[BBC News]] |url= | * {{ cite news |title= Experts test cloaking technology |work= [[BBC News]] |url= https://news.bbc.co.uk/1/hi/sci/tech/6064620.stm |access-date= 5 August 2008 |date= 19 October 2006 |first= Paul |last= Rincon}} | ||
* {{usurped|1=[https://archive.today/20060324015117/http://www.mosnews.com/news/2006/01/25/capofdarkness.shtml Mosnews - Dr Oleg Gadomsky Cloaking Device Article]}} | * {{usurped|1=[https://archive.today/20060324015117/http://www.mosnews.com/news/2006/01/25/capofdarkness.shtml Mosnews - Dr Oleg Gadomsky Cloaking Device Article]}} | ||
* "[https://web.archive.org/web/20141123104839/http://www.nbcnews.com/id/7047872 MSNBC: Can objects be turned invisible?]" | * "[https://web.archive.org/web/20141123104839/http://www.nbcnews.com/id/7047872 MSNBC: Can objects be turned invisible?]" | ||
Latest revision as of 13:47, 15 November 2025
Template:Short description Script error: No such module "For". Template:Multi image A cloaking device is a hypothetical 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. Fictional cloaking devices have been used as plot devices in various media for many years.
Developments in scientific research[1] 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] However, over the entire spectrum, a cloaked object scatters more than an uncloaked object.[3]
Fictional origins
Script error: No such module "Labelled list hatnote". Cloaks with magical powers of invisibility appear from the earliest days of story-telling. Since the advent of modern Science fiction, many variations on the theme with proposed basis in reality have been imagined. Star Trek screenwriter Paul Schneider, inspired in part by the 1958 film Run Silent, Run Deep, and in part by The Enemy Below, which had been released in 1957, imagined cloaking as a space-travel analog of a submarine submerging, and employed it in the 1966 Star Trek episode "Balance of Terror", in which he introduced the Romulan species, whose space vessels employ cloaking devices extensively. (He likewise predicted, in the same episode, that invisibility, "selective bending of light" as described above, would have an enormous power requirement.) Another Star Trek screenwriter, D.C. Fontana, coined the term "cloaking device" for the 1968 episode "The Enterprise Incident", which also featured Romulans.
Star Trek placed a limit on use of this device: a space vessel cannot fire weapons, employ defensive shields, or operate transporters while cloaked;[4] thus it must "decloak" to fire.[5] At this point, Trek parted ways with the submarine analogy (subs don't "surface" to launch torpedoes), instead anticipating a significant limitation of Stealth technology: aircraft like the B-2 bomber cannot avoid becoming un-stealthy during the time their bomb bay doors are open.
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 is more properly referred to as "active camouflage". Alternatively, metamaterials provide the theoretical possibility of making electromagnetic radiation pass freely around the 'cloaked' object.[6]
Metamaterial research
Script error: No such module "Labelled list hatnote". Optical metamaterials have featured in several 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.[7][8]
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.[9][10][11] 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.[12][13]
Active camouflage
Script error: No such module "Labelled list hatnote".
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.[14] Mercedes demonstrated an invisible car using LED and camera in 2012.[15]
Plasma stealth
Script error: No such module "Labelled list hatnote". 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.[16] The Defense Technical Information Center is also following up research on plasma reducing RCS technologies.[17] A plasma cloaking device was patented in 1991.[18]
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 at Austin by Professor Andrea Alù.[19]
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.[19] The device only cancelled out the scattering of microwaves in the first order.[19] The same researchers published a paper on "plasmonic cloaking" the previous year.[20]
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.[21]
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 frequencies as well as touching in mechanics. This renders an object "invisible" to sound or even hides it from touching.[22]
See also
References
Template:Reflist Template:Refbegin
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- Template:Usurped
- "MSNBC: Can objects be turned invisible?"
- Optical Camouflage by the Tachi Lab in Japan
- Space Daily - Engineers Create Optical Cloaking Design For Invisibility, April, 2007
External links
- University of Texas at Austin, Cockrell School of Engineering, Researchers at UT Austin Create an Ultrathin Invisibility Cloak, 26 March 2013.
- New Journal of Physics, "Demonstration of an ultralow profile cloak for scattering suppression of a finite-length rod in free space", by JC Soric, PY Chen, A Kerkhoff, D Rainwater, K Melin, and Andrea Alù, March 2013.
- New Journal of Physics, "Experimental verification of three-dimensional plasmonic cloaking in free-space", by D Rainwater, A Kerkhoff, K Melin, J C Soric, G Moreno and Andrea Alù, January 2012.
- Physical Review X, "Do Cloaked Objects Really Scatter Less", by Francesco Monticone and Andrea Alù, October 2013.
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- ↑ Script error: No such module "citation/CS1".
- ↑ Sledge, Gary. "Going Where No One Has Gone Before", Discovery Channel Magazine #3. Template:Catalog lookup linkScript error: No such module "check isxn".Script error: No such module "check isxn".Script error: No such module "check isxn".Script error: No such module "check isxn".Script error: No such module "check isxn".Script error: No such module "check isxn".Script error: No such module "check isxn".Script error: No such module "check isxn".Script error: No such module "check isxn".
- ↑ Script error: No such module "Citation/CS1".
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- ↑ a b Script error: No such module "citation/CS1".
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- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Clark, Josh. "Is the army testing an invisible tank?" Template:Webarchive, HowStuffWorks.com, 3 December 2007. accessed 22 February 2012.
- ↑ Script error: No such module "citation/CS1".
- ↑ Plasma cloaking: Air chemistry, broadband absorption, and plasma generation backup Template:Webarchive, February 1990.
- ↑ Gregoire, D. J. ; Santoru, J. ; Schumacher, R. W.Abstract Template:Webarchive Electromagnetic-Wave Propagation in Unmagnetized Plasmas Template:Webarchive, March 1992.
- ↑ Roth, John R. "Microwave absorption system" U.S. patent 4989006
- ↑ a b c Script error: No such module "citation/CS1".
- ↑ http://iopscience.iop.org/1367-2630 New Journal of Physics, March 2013.
- ↑ Script error: No such module "citation/CS1".
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