Like a mini-Etch A Sketch, conductors can be written and re-written into an insulating solid, according to Washington State University physicists. It happens when crystals of strontium titanate are exposed to a laser beam, causing ‘persistent photoconductivity’. Heating improves the writeability. “It opens up a new type of electronics where you can define a circuit optically ...
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from Electronics Weekly https://www.electronicsweekly.com/news/research-news/writing-conductors-laser-2017-08/
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