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Okay, it is a good start to have this material moved to a separate page. However I think invisibility science is not a good choice of name, as it is overly broad. I assume that this page should focus on metamaterial-based and plasmonic cloaking (which have also been implemented with metamaterials at microwaves). Therefore I would suggest "Metamaterial Cloak", "Material Cloaking" or something similar. ShiftyDave ( talk) 00:19, 29 December 2009 (UTC)
I just made some minor spelling corrections. The only one I wasn't sure about was changing "diploar" to "dipolar". I couldn't find "diploar" in the dictionary or wikipedia, and couldn't tell whether its occurrences on the web were correct or also misspellings, given that "dipolar scattering" also appeared. Someone below spells it "diploar" repeatedly, but again I don't know if that's correct or a repeated mistake. NoJoy ( talk) 20:56, 27 March 2010 (UTC)
Since this article has been a stub since Feb. 2008, I merged the content from Transformation optics. That article in its current state is better served at "Invisibility science" where it can be developed as part of another article which includes this topic. Steve Quinn (formerly Ti-30X) ( talk) 04:39, 29 December 2009 (UTC)
I went ahead and renamed "Invisibility science" to "Metamaterial cloaking". Steve Quinn (formerly Ti-30X) ( talk) 23:02, 29 December 2009 (UTC)
I reccomend changing the title of this article to Transformation optics, since there are other sections (and research) which utilize transformation optics besides cloaking. This would probably be a more accurate title (or something similar). Steve Quinn (formerly Ti-30X) ( talk) 06:29, 30 January 2010 (UTC)
I'm finally coming back to this after a couple months. My ideas for the article are as follows:
I think something like this would focus the article on cloaking based on metamaterials and provide a good introduction to someone not familiar with the literature from a conceptual standpoint. RFenginerd ( talk) 01:58, 25 May 2010 (UTC)
The lead section of this article does not accurately convey the current content. It implies that, at the very least, the following topics will be described and discussed:
Just skimming over this article, this doesn't appear to be the case. In fact, transformation optics seems to pervade more of the article than its heading suggests, while none of the other terms are defined or even used in an easily recognized form in the remainder of the article. And, of course, there's the ever-present problem of jargon-dense information without any more readily accessible introductions to each subtopic.
It seems to me that the chief problem of this article is that it has no organization; i.e., a well-defined subject that can be broken down into subtopics and arranged in a logical flow. I only ever got as far as an physics minor in college (not optics!), and my head spins trying to assess the content as it is. But I suspect that it might be assembled into something like this:
Assuming this is a reasonable organization of the content, all the remaining material should go under one of these headings. (Even if transformation optics winds up being a huge subsection, the other approaches should have at least summary paragraphs as placeholders. The structure will show potential editors what's needed.) If they don't fit, then my suggestion isn't adequate, but some logical order and flow needs to be imposed. Also, the current "In the news" section doesn't belong here at all. If there is meaningful information to contribute from these media sightings, it should be incorporated into the text of the article with appropriate citations.
I realize that this article has gone through a few major transformations, which no doubt contributed to the problems. I hope my suggestions are of some use in fixing them. ~ Jeff Q (talk) 04:12, 24 February 2010 (UTC)
Merged content, except for the introduction, from Metamaterial cloaking to a new article. See revision history of this article and the new article, "Variteites of cloaking theories". This really needs its own article because these sections tend to veer off topic from the 'Metamaterial cloaking' article.
Since the first cloak in 2006, produced with gradient-index metamaterials, other invisibilty cloaking theories have been developed. "Variteites of cloaking theories" discusses the various cloaking theories, which have been published in peer reviewed, scientific articles. This is a review article which describes various theories. Except for a small summary, Metamaterial cloaking will not be discussed here because it already has its own article. However, some of the theories discussed here employ metamterials, but, perhaps in a different manner than the original demonstation and its succesor, the broad-band cloak.
Invisiblity-cloaking, in this context, is the scientific theory of appearing to render objects invisible to the electromagnetic spectrum. Of course the objects are really there, and only appear invisible ---- Steve Quinn (formerly Ti-30X) ( talk) 16:50, 24 May 2010 (UTC)
If you place a surface lets say a mirror behind the cloaked object and a pulsating light source and an optical sensor (like a camera) hooked up to a computer in front of it. Because the light travels around the object (as opposed to pass trough it like in a fictional cloak) it must undoubtedly create a slight delay meaning that light wich missed the cloak would return slightly faster and a fast enough computer with sensitive enough equipment would realise that something is cloaked infront of it. My question is if this delay is significant enough to be spotted by the naked eye? 81.233.213.183 ( talk) 18:26, 11 December 2010 (UTC)
In case this is considered notable enough for a future update, maybe to the "In the news" section: metamaterial cloaking was the primary focus of an episode of the TV series "Sci Fi Science: Physics of the Impossible", hosted by Michio Kaku. The episode in question was the fifth of the first season, titled "How to Become Invisible", and aired on December 22nd 2009 on the Science Channel. Further information is on IMDb. 84.227.137.89 ( talk) 02:45, 2 March 2011 (UTC)
Presumably these reports mean that the article can be expanded ?
BBC: 'Antimagnet' joins list of invisibility approaches
and
NewScientist: Invisibility cloak to hide magnetic fields
EdwardLane ( talk)
What happens to radiation coming from inside the cloak? The cloaked object will emit thermal radiation (mostly in the infrared range), what happens when this radiation hits the layer of metamaterial? Will it bounce back (which would cook a living being or anything with a power source), or will it pass through (though perhaps scrambled) and be visible to an observer outside? I'd say that's a very important question if you are talking about building actual cloaking devices 89.99.122.33 ( talk) 19:46, 21 February 2013 (UTC)
Someone created an article on Ultra-thin invisibility Cloak. I have cleaned it up, renamed it Metascreen microwave invisibility cloak and given it proper references. I do not know whether it should be merged into this article.-- Toddy1 ( talk) 17:35, 21 April 2013 (UTC)
The statement: "Every natural material so far only allows for a positive refractive index. " is not true. Already in 1969 optical lines in the far infrared with negative dispersion have been observed: Pine, A. S., and G. Dresselhaus. "Linear Wave-Vector Shifts in the Raman Spectrum of α-Quartz and Infrared Optical Activity." Physical Review 188.3 (1969): 1489. — Preceding unsigned comment added by 79.251.7.55 ( talk) 17:17, 10 March 2014 (UTC)
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This is the
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Okay, it is a good start to have this material moved to a separate page. However I think invisibility science is not a good choice of name, as it is overly broad. I assume that this page should focus on metamaterial-based and plasmonic cloaking (which have also been implemented with metamaterials at microwaves). Therefore I would suggest "Metamaterial Cloak", "Material Cloaking" or something similar. ShiftyDave ( talk) 00:19, 29 December 2009 (UTC)
I just made some minor spelling corrections. The only one I wasn't sure about was changing "diploar" to "dipolar". I couldn't find "diploar" in the dictionary or wikipedia, and couldn't tell whether its occurrences on the web were correct or also misspellings, given that "dipolar scattering" also appeared. Someone below spells it "diploar" repeatedly, but again I don't know if that's correct or a repeated mistake. NoJoy ( talk) 20:56, 27 March 2010 (UTC)
Since this article has been a stub since Feb. 2008, I merged the content from Transformation optics. That article in its current state is better served at "Invisibility science" where it can be developed as part of another article which includes this topic. Steve Quinn (formerly Ti-30X) ( talk) 04:39, 29 December 2009 (UTC)
I went ahead and renamed "Invisibility science" to "Metamaterial cloaking". Steve Quinn (formerly Ti-30X) ( talk) 23:02, 29 December 2009 (UTC)
I reccomend changing the title of this article to Transformation optics, since there are other sections (and research) which utilize transformation optics besides cloaking. This would probably be a more accurate title (or something similar). Steve Quinn (formerly Ti-30X) ( talk) 06:29, 30 January 2010 (UTC)
I'm finally coming back to this after a couple months. My ideas for the article are as follows:
I think something like this would focus the article on cloaking based on metamaterials and provide a good introduction to someone not familiar with the literature from a conceptual standpoint. RFenginerd ( talk) 01:58, 25 May 2010 (UTC)
The lead section of this article does not accurately convey the current content. It implies that, at the very least, the following topics will be described and discussed:
Just skimming over this article, this doesn't appear to be the case. In fact, transformation optics seems to pervade more of the article than its heading suggests, while none of the other terms are defined or even used in an easily recognized form in the remainder of the article. And, of course, there's the ever-present problem of jargon-dense information without any more readily accessible introductions to each subtopic.
It seems to me that the chief problem of this article is that it has no organization; i.e., a well-defined subject that can be broken down into subtopics and arranged in a logical flow. I only ever got as far as an physics minor in college (not optics!), and my head spins trying to assess the content as it is. But I suspect that it might be assembled into something like this:
Assuming this is a reasonable organization of the content, all the remaining material should go under one of these headings. (Even if transformation optics winds up being a huge subsection, the other approaches should have at least summary paragraphs as placeholders. The structure will show potential editors what's needed.) If they don't fit, then my suggestion isn't adequate, but some logical order and flow needs to be imposed. Also, the current "In the news" section doesn't belong here at all. If there is meaningful information to contribute from these media sightings, it should be incorporated into the text of the article with appropriate citations.
I realize that this article has gone through a few major transformations, which no doubt contributed to the problems. I hope my suggestions are of some use in fixing them. ~ Jeff Q (talk) 04:12, 24 February 2010 (UTC)
Merged content, except for the introduction, from Metamaterial cloaking to a new article. See revision history of this article and the new article, "Variteites of cloaking theories". This really needs its own article because these sections tend to veer off topic from the 'Metamaterial cloaking' article.
Since the first cloak in 2006, produced with gradient-index metamaterials, other invisibilty cloaking theories have been developed. "Variteites of cloaking theories" discusses the various cloaking theories, which have been published in peer reviewed, scientific articles. This is a review article which describes various theories. Except for a small summary, Metamaterial cloaking will not be discussed here because it already has its own article. However, some of the theories discussed here employ metamterials, but, perhaps in a different manner than the original demonstation and its succesor, the broad-band cloak.
Invisiblity-cloaking, in this context, is the scientific theory of appearing to render objects invisible to the electromagnetic spectrum. Of course the objects are really there, and only appear invisible ---- Steve Quinn (formerly Ti-30X) ( talk) 16:50, 24 May 2010 (UTC)
If you place a surface lets say a mirror behind the cloaked object and a pulsating light source and an optical sensor (like a camera) hooked up to a computer in front of it. Because the light travels around the object (as opposed to pass trough it like in a fictional cloak) it must undoubtedly create a slight delay meaning that light wich missed the cloak would return slightly faster and a fast enough computer with sensitive enough equipment would realise that something is cloaked infront of it. My question is if this delay is significant enough to be spotted by the naked eye? 81.233.213.183 ( talk) 18:26, 11 December 2010 (UTC)
In case this is considered notable enough for a future update, maybe to the "In the news" section: metamaterial cloaking was the primary focus of an episode of the TV series "Sci Fi Science: Physics of the Impossible", hosted by Michio Kaku. The episode in question was the fifth of the first season, titled "How to Become Invisible", and aired on December 22nd 2009 on the Science Channel. Further information is on IMDb. 84.227.137.89 ( talk) 02:45, 2 March 2011 (UTC)
Presumably these reports mean that the article can be expanded ?
BBC: 'Antimagnet' joins list of invisibility approaches
and
NewScientist: Invisibility cloak to hide magnetic fields
EdwardLane ( talk)
What happens to radiation coming from inside the cloak? The cloaked object will emit thermal radiation (mostly in the infrared range), what happens when this radiation hits the layer of metamaterial? Will it bounce back (which would cook a living being or anything with a power source), or will it pass through (though perhaps scrambled) and be visible to an observer outside? I'd say that's a very important question if you are talking about building actual cloaking devices 89.99.122.33 ( talk) 19:46, 21 February 2013 (UTC)
Someone created an article on Ultra-thin invisibility Cloak. I have cleaned it up, renamed it Metascreen microwave invisibility cloak and given it proper references. I do not know whether it should be merged into this article.-- Toddy1 ( talk) 17:35, 21 April 2013 (UTC)
The statement: "Every natural material so far only allows for a positive refractive index. " is not true. Already in 1969 optical lines in the far infrared with negative dispersion have been observed: Pine, A. S., and G. Dresselhaus. "Linear Wave-Vector Shifts in the Raman Spectrum of α-Quartz and Infrared Optical Activity." Physical Review 188.3 (1969): 1489. — Preceding unsigned comment added by 79.251.7.55 ( talk) 17:17, 10 March 2014 (UTC)
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