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This tiny radio — whose building blocks are the size of two atoms — can withstand extremely harsh environments and is biocompatible, meaning it could work anywhere from a probe on Venus to a pacemaker in a human heart. Credit: Eliza Grinnell/Harvard SEAS

Harvard engineers have made the world’s smallest radio receiver – built out of an assembly of atomic-scale defects in pink diamonds. This tiny radio—whose building blocks are the size of two atoms—can withstand extremely harsh environments and is biocompatible, meaning it could work anywhere from a probe on Venus to a pacemaker in a human heart. The research was led by Marko Loncar, Tiantsai Lin Professor of Electrical Engineering at SEAS, and his graduate student Linbo Shao.

This tiny radio — whose building blocks are the size of two ...