Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Flirting With Invisibility
06-13-2007, 01:16 PM,
#1
Flirting With Invisibility
*SNIP*
Light Fantastic: Flirting With Invisibility

Increasingly, physicists are constructing materials that bend light the “wrong” way, an optical trick that could lead to sharper-than-ever lenses or maybe even make objects disappear.

Last October, scientists at Duke demonstrated a working cloaking device, hiding whatever was placed inside, although it worked only for microwaves.

In the experiment, a beam of microwave light split in two as it flowed around a specially designed cylinder and then almost seamlessly merged back together on the other side. That meant that an object placed inside the cylinder was effectively invisible. No light waves bounced off the object, and someone looking at it would have seen only what was behind it.

The cloak was not perfect. An alien with microwave vision would not have seen the object, but might have noticed something odd. “You’d see a darkened spot,” said David R. Smith, a professor of electrical and computer engineering at Duke. “You’d see some distortion, and you’d see some shadowing, and you would see some reflection.”

A much greater limitation was that this particular cloak worked for just one particular “color,” or wavelength, of microwave light, limiting its usefulness as a hiding place. Making a cloak that works at the much shorter wavelengths of visible light or one that works over a wide range of colors is an even harder, perhaps impossible, task.

Nonetheless, the demonstration showed the newfound ability of scientists to manipulate light through structures they call “metamaterials.”

*SNIP*

Full story
[Image: absurditiesvoltaire300oh0.gif]
------------------
&I've come to the conclusion, after having spent many years in politics, is that our presidential elections turn out to be more of a charade than anything else, and I think that is true today. It is a charade,& - Ron Paul, Sept 2008.
------------------
We're in a lot of trouble, watch this - http://www.youtube.com/v/3L3QVn4JyYA
------------------
[Image: guns250x200dw9.jpg]
[Image: armiw4.gif]
------------------
You cannot tax someone's labor because that is slavery
- Ed Brown, June 18 2007
------------------
The world's &freeest& country has the highest number in prison.
- arundhati roy
------------------
The crisis of modern democracy is a profound one. Free elections, a free press and an independent judiciary mean little when the free market has reduced them to commodities available on sale to the highest bidder.
- arundhati roy
------------------
The era of manufacturing consent has given way to the era of manufacturing news. Soon media newsrooms will drop the pretense, and start hiring theater directors instead of journalists.
- arundhati roy
------------------
The structure of capitalism is flawed. The motor that powers it cannot but vastly increase the disparity between the poor and the rich globally and within countries as well. Parecon is a brave argument for replacing that flawed machine and offers a much needed -- more equitable, democratic, participatory -- alternative economic vision.
- arundhati roy
------------------
[The choice between John Kerry and George Bush] is not a real choice. It's an apparent choice. Like choosing a brand of detergent. Whether you buy Ivory Snow or Tide, they're both owned by Proctor & Gamble.
- arundhati roy
------------------
No government's condemnation of terrorism is credible if it cannot show itself to be open to change by nonviolent dissent
- arundhati roy
[Image: sigterrorgj3.jpg]
------------------
Dr. Hermann Oberth who pioneered rocket design for the German Reich during World War II and later advanced rocket technology for the American manned space launches, cryptically stated: "We cannot take the credit for our record advancement in certain scientific fields alone; we have been helped."

When asked by whom, he replied: "The people of other worlds."
Reply


Possibly Related Threads...
Thread Author Replies Views Last Post
  Invisibility cloak closer with flexible 'metamaterial' TriWooOx 1 795 11-07-2010, 08:22 PM
Last Post: JazzRoc
  Invisibility Cloak for Almost-Visible Light --- 1 858 05-03-2009, 07:24 PM
Last Post: mastermg
  Invisibility cloak 'step closer' TriWooOx 4 1,329 08-26-2008, 05:22 PM
Last Post: Rosebery

Forum Jump:


Users browsing this thread: 1 Guest(s)