A cloaking screens in our lifetime? 9 replies

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emonkies

I'm too cool to Post

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17th July 2003

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#1 11 years ago

Seems Scientists have discovered a material that has a negative refraction index, it bends light around it and reflects light off of it.

One of the materials out now acts in visible light spectrum.

Invisibility cloak one step closer, scientists say - Yahoo! News




Guest

I didn't make it!

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#2 11 years ago

Anlushac11;4498965Seems Scientists have discovered a material that has a negative refraction index, it bends light around it and reflects light off of it.

One of the materials out now acts in visible light spectrum.

Invisibility cloak one step closer, scientists say - Yahoo! News

I saw something on these Meta materials awhile ago on Discovery. It's truly impressive how far along we have come in terms of science. What a short journey it's been, and what a long journey we have ahead of us.




Serio VIP Member

The Dane

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11th November 2006

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#3 11 years ago

Nice! And with the recent breakthrough in Teleportation(Recent as in 2005-06), we can soon teleport invisible soldiers into enemy bases!

I'm going to guess by 2020 we'll have Nanosuits like the ones in Crysis!




LaughingCheese

Behold the Power of CHEESE!!!

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16th June 2004

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#4 11 years ago

Afterburner;4499024I saw something on these Meta materials awhile ago on Discovery. It's truly impressive how far along we have come in terms of science. What a short journey it's been, and what a long journey we have ahead of us.[/quote]

I can has hyperdrive?

[quote=Serio;4499138]Nice! And with the recent breakthrough in Teleportation(Recent as in 2005-06), we can soon teleport invisible soldiers into enemy bases!

I'm going to guess by 2020 we'll have Nanosuits like the ones in Crysis!

Really?! I didn't hear about that. Linky?




Riffington

Biff's Publicist

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4th August 2008

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#5 11 years ago

The problem with these invisible materials is that you need to be careful that they don't get scratched. On the upside, they allow for some neat mud effects.




Rich19

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14th August 2004

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#6 11 years ago

I've done considerable research on metamaterials for my physics coursework at college, so I reckon I know a fair bit about them. This is an exciting new development in the field, and I'm looking forward to finding out more about it.

Metamaterials are nothing new - negative refractive index was first shown to be possible in 1967, and scientists have been researching the idea for a while. The basic idea is to create a set of components which resonate with the electric and magnetic fields of electromagnetic radiation, setting up fields opposed to the ones associated with the EM radiation. Such a material would have negative valued for permittivity and permeability, therefore achieving the negative refractive index from the equation n = √εμ . The problem is that the components need to be smaller than the wavelength of the EM waves, so as to not obstruct them. The wavelength of visible light is around 380-780nm.

In Around 2000-2003 scientists managed to develop a metamaterial for microwaves (wavelength ~3cm), which looked like this:

Spoiler: Show
pwpia2_05-03.jpg

In December 06 they created a material which had a refractive index of -0.6 for a wavelength of 780nm - just in the visible region. However, there were problems with the material such as the amount of light absorbed by the material itself. A picture of it:

Spoiler: Show

meta.jpg

There are other possible applications of metamaterials, such as perfect lenses which can beat the diffraction limit. All in all, a very exciting research path. :D




liquideyez

closer to the edge

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9th March 2005

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#7 11 years ago

so do metamaterials require any energy source? i can imagine special forces and govern. agencies using this. but would it be practical for public use?




Riffington

Biff's Publicist

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4th August 2008

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#8 11 years ago

Metamaterials don't require any more energy than eyeglasses.




Primarch Vulkan VIP Member

For the Emperor! Knights of Caliban!

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16th March 2004

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#9 11 years ago

Intersting.....then can we make warp drive?


[color=#000000][size=2][b][i]Heralds of the coming doom, Like the cry of the Raven, we are drawn, This oath of war and vengeance, On a blade of exalted iron sworn, With blood anointed swords



Rich19

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14th August 2004

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#10 11 years ago

If by "warp drive" you mean faster than light travel, then no.