A Professor Made A Device That Can Make You Invisible

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Three years ago, researchers John Howell and Joseph Choi of Rochester University demonstrated a three-dimensional, transmitting, continuously multidirectional cloak in the visible regime. The physicists developed a versatile cloaking device, which hides things from view. What makes their experiment special is that anyone can make this crazy concealing device at home for under $100.

The Rochester cloaking device features four standard lenses that allow objects to appear invisible as the viewer moves away from the optimal viewing positions. To make objects invisible, all you need are the four lenses and an optics bench for holding the lenses in place.


There are four steps needed to make the cloaking device:

• Acquire two sets of 2 lenses with different focal lengths f1 and f2 (4 lenses total, 2 with f1 focal length, and 2 with f2 focal length).
• Separate the first two lenses by the sum of their focal lengths (So f1 lens is the first lens, f2 is the 2nd lens, and they are separated by t1= f1+ f2).
• Do the same in Step 2 for the other two lenses.
• Separate the two sets by t2=2 f2 (f1+ f2) / (f1– f2) apart, so that the two f2 lenses are t2 apart.

The video shows Howell and his 14-year-old son Benjamin offering a basic demonstration of optical cloaking. Howell was assisted by his son to build three but effective optical cloaking devices with inexpensive, off-the-shelf materials.
Cloaking is a topic long explored in popular culture and scientific community. Howell’s cloaking experiment reveals the possibility of doing optical, unidirectional cloaking cheaply, and for large objects.

Howell and Choi first published their research on the online paper depository ar xiv on September 14, 2014. Their paper explained the strengths and limitations of the three approaches they used. They used plexiglass, four $3 lenses, and an assembly of inexpensive, hardware-store mirrors to demonstrate spatial cloaking. The scientists admitted that their device has some drawbacks but is clearly scalable to very large dimensions.

This small feat of optical engineering has the potential to hide satellites in mid- to high-earth orbit. The Rochester could also be used as a teaching tool to show students how and science can do magic. It is also possible to create a system to assist truck drivers to see through the obstructions on their vehicles.

Howell and Choi based their experiment on their previous investigation into a low-tech light direction which they published in a March 2014 paper in the journal Optics Express. Howell’s son, Benjamin, was a coauthor on that study.



Photo – https://www.youtube.com/watch?v=oJb9RnAVDuE



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