physics4me

This video simulates the time cloaking device developed by Cornell University researchers. A ball is trying to pass through a green beam of laser light without being detected. Two short pulses of red laser light change the color of the green light, and since different colors travel at different speeds, a gap is opened in the beam exactly when the ball is passing through. Then the opposite manipulation closes the gap, and two other pulses change the light back to green. Hence, the ball manages to go through the beam without getting detected.

http://youtu.be/GXxzBvN4sKM