How To Turn A Laser Into A Tractor Beam [Not Ready for the Enterprise Yet]

The Technology Review: If the scattering angle is just right, the total momentum in the direction of propagation can be negative, meaning the particle is pulled back towards the source and the light becomes a tractor beam. I don’t know what I want more now: a laser that cuts through walls or a tractor beam.…

The Technology Review:

If the scattering angle is just right, the total momentum in the direction of propagation can be negative, meaning the particle is pulled back towards the source and the light becomes a tractor beam.

I don’t know what I want more now: a laser that cuts through walls or a tractor beam. Nah, who am I kidding — I want the cutting laser.

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