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From MITnews:
If you want to create a moving light source, you have a few possibilities. One is to mount a light emitter in some kind of mechanical housing - the approach used in, say, theatrical spotlights, which stagehands swivel and tilt to track performers.
Another possibility, however, is to create an array of light emitters and vary their "phase" - the alignment of the light waves they produce. The out-of-phase light waves interfere with one another, reinforcing each other in some directions but annihilating each other in others. The result is a light source that doesn't move, but can project a beam in any direction.
Read the whole article
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Re: Chips That Can Steer Light
