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 Posted: Mon Aug 27, 2007 3:36 pm
I have an idea for a sort of Invisibility Cloak. I would like your opinions on it. The idea comes from an article I read a while ago. I can't find the original, but this Wikipedia article gives the essentials:
http://en.wikipedia.org/wiki/Cloak_of_invisibility#Cloaks_of_invisibility_in_science
So, as technology advances, we will eventually be able to mask visible spectrum, but the problem is that doing so will render anything inside the 'cloak' unable to see. What if we left out the infrared spectrum and equipped the user with infrared goggles covered in the invisibility material?
Opinions?
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Posted: Wed Aug 29, 2007 9:33 pm
Wouldn't someone be able to, well, see you with infrared goggles? The lens is still transparent, has to be.
'sides, AFAIK, there's no way to do it with all wavelengths at the same time, and from all angles. As always, "if technology advances to a point where we can do it, then yes, we can do it". The key is that so far there have been no major breakthroughs regarding that area.
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Posted: Thu Aug 30, 2007 7:51 am
If the lens is covered in the material, then the visible spectrum would still go around it, but it would be transparent for infrared.
Also, if separate metamaterials can be made for at at least a small range of spectra, it could be possible to layer them to achieve the desired effect.
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Posted: Thu Aug 30, 2007 9:07 pm
Ok, to put it clearer: For you to see something through it, light has to be able to travel from the target to your eyes. If light can travel (in any particular frequency) from an object towards you, it can travel from you to the object, hence there is no way to see and be transparent at the same time, in any particular wavelength.
Any part that is not covered by a material that makes IR invisible will be visible using IR, and any part that IS covered, will not be able to see anything using IR. There's no way =p
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Posted: Fri Aug 31, 2007 2:25 pm
Yes, if the material doesn't cover IR, then you are visible using infrared. However, to a normal human being, you are effectively invisible.
For example, if there was a bank robbery and the situation deteriorated into a hostage situation, a SWAT team could enter undetected, given that the criminals don't have IR detection (which is unlikely). I'm not saying the person has to be perfectly invisible, I just want to get close enough to be practical.
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Posted: Sun Sep 02, 2007 6:36 am
My reading on metamaterials is a little thin, mostly because it hasn't interested me so much with its current limitations, but wouldn't this be more suitable for say a car or in military practice to shield vehicles from things such as LIDAR?
As for your idea, leaving the infrared leaves you basically visible, limiting this things use to basically sneaking around Hogwarts.
Using lower frequency em waves is not a bad idea, but infrared is too common for a form of 'vision'. Perhaps radio waves? The other option of course, is to create a microscopic artificial eye. By the time we have the technology for this, I'm sure they will be able to create incredibly small camera 'eyes' and if they are small enough they will be near impossible to notice.
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Posted: Sun Sep 02, 2007 8:30 pm
My personal opinion is that you will be able to make an invisibility cloack the day you can make light bend.
Sorry I don't know exactly what you are talking about, but I see no light bending.
However it may be possible to create a clock that produces some appearance of invisibilty, without actually being invisible, or something like that.
Is that what you are atlking about?
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Posted: Sun Sep 02, 2007 8:32 pm
Dewdew My personal opinion is that you will be able to make an invisibility cloack the day you can make light bend. Sorry I don't know exactly what you are talking about, but I see no light bending. However it may be possible to create a clock that produces some appearance of invisibilty, without actually being invisible, or something like that. Is that what you are atlking about? Here you go: Metamaterials and invisibility
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