University of Michigan researchers are using a femtosecond pulsed laser as a milling machine capable of carving out features as small as 20 nanometers, 1/5000th the diameter of a human hair. The new approach trumps state-of-the-art electron beam lithography because it can machine features in three dimensions. "If we have three channels on a plane, we can link the outer two without cutting into the center one, we can go down over and up, we can cut a U-shape," said one of the principal investigators. "Not being constrained to one plane, the level of complexity that can be achieved is much greater." Link
New tool for the molecular machine shop
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