Friday, March 25, 2016


CHAMELEO fans, please take note....

What follow are choice excerpts from a 9-25-14 article published on the University of Rochester's website (recently sent to me by correspondent Eric Blair).  The article, entitled "'Cloaking' Device Uses Ordinary Lenses to Hide Objects Across Range of Angles," opens with the following paragraph:  

"Inspired perhaps by Harry Potter’s invisibility cloak, scientists have recently developed several ways—some simple and some involving new technologies—to hide objects from view. The latest effort, developed at the University of Rochester, not only overcomes some of the limitations of previous devices, but it uses inexpensive, readily available materials in a novel configuration."
Skipping down in the article:  
"Their simple configuration improves on other cloaking devices, but it’s not perfect. 'This cloak bends light and sends it through the center of the device, so the on-axis region cannot be blocked or cloaked,' said [doctoral student Joseph] Choi. This means that the cloaked region is shaped like a doughnut. He added that they have slightly more complicated designs that solve the problem.  Also, the cloak has edge effects, but these can be reduced when sufficiently large lenses are used.
"In a new paper submitted to the journal Optics Express and available on [UPDATE 11/19/2014: The paper has now been published in Optics Express], [Professor John] Howell and Choi provide a mathematical formalism for this type of cloaking that can work for angles up to 15 degrees, or more.  They use a technique called ABCD matrices that describes how light bends when going through lenses, mirrors, or other optical elements."
To read the entire article, click HERE.

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