Harvard uses pink diamonds to create the smallest atomic-scale radio receiver

Harvard scientists have created the world's smallest radio receiver with components built on an atomic scale, using tiny atomic scale defects in pink diamonds. Researchers at the Harvard University's John Paulson School of Engineering and Applied Sciences have placed radio receiver assemblies in two-atom-sized components that can withstand extreme environments. The assembly is also biocompatible, meaning it can be placed in the human body and this diamond defect is known as the nitrogen vacancy (NV) center. The team created the NV center by replacing one carbon atom in the diamond crystal with a nitrogen atom and then removing the adjacent nitrogen atom. This creates a system that is a nitrogen atom with a hole next to it. These NV centers can emit a single photoelectron or detect a weak magnetic field. The NV center also has photoluminescent properties.
The last point means that the NV center can convert information into light, making it a large and potential system for quantum computing, photonics and sensing. Building a radio receiver requires five components, including power, receiver, transducer, speaker, and tuner. Scientists use green lasers to energize electrons in the NV center.
When powered, the electrons are sensitive to electromagnetic fields, including FM waves. When the audio signal is received, it is emitted as red light, which can be interpreted by the photodiode and converted to current. The current is then converted to sound through a speaker or earphone. An electromagnet can then be used to tune the radio station, resulting in a very good radio receiver that can operate at approximately 660 F.

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