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December 22, 2019 08:34 pm

Researcher Uses Focused Gallium Ions To Build A Microscopic Gingerbread House

"Travis Casagrande, a research associate at the Canadian Centre for Electron Microscopy at Hamilton's McMaster University has created the smallest gingerbread house ever built," writes long-time Slashdot reader Mr.Fork, "even smaller than the one made in France last year by nanorobotics researchers at the Femto-ST Institute in BesanÃon." "Decking the halls is a whole lot harder when you're decorating something 10 times smaller than a human hair," reports the CBC:Casagrande's creation is a home for the holidays -- a gingerbread house complete with a wreath over the door, a cheery brick chimney, Christmas tree details carved into the walls and a patriotic Canadian flag doormat. "Compared to the size of a typical gingerbread house that you might buy in a grocery store kit, mine is 20,000 times smaller," he explained... Zoom out slightly from the silicon structure and you'll see it's actually perched atop a smiling snowman that's giving a mischievous wink. Pull back even farther and a seemingly massive cylinder appears -- believe it or not, that's a human hair... "The point of that was sort of to make some jaws drop when you realize even the snowman, which is much bigger than the house, is extremely tiny compared to the hair you see next...." Casagrande used a focused ion beam microscope to etch out the microscopic details with a beam of charged gallium ions, which he compared to a sandblaster... " I wanted to spark some curiosity of science because that leads to better science literacy."

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