Teeny-tiny Tetris:
A real-life implementation of the evergreen arcade game Tetris was obtained by optically trapping 42 glass microspheres
(1 μm diameter) in a 25 μm x 20 μm sized field under a microscope.
Their positions are then steered with a computer.
The generation of multiple traps, as well as the computer-steering, is accomplished by the use of acousto-optic deflectors:
devices that tune the deflection of a laser beam that have very fast response.
(Thanks, Higgins!)
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