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Nanoscale FM radio station

02.12.2013

A group of physicists and engineers from the United States and the Republic of Korea has created a nanoscale device for frequency modulation of signals with a frequency of about 100 MHz. This corresponds to the FM band. It was possible to achieve a sharp reduction in the dimensions of the device by replacing the quartz crystal with a graphene sheet.

The authors of the new development point out that quartz resonators traditionally used to generate signals with a frequency of about 100 MHz take up a lot of space and it is basically impossible to reduce their size. The principle of operation of a quartz oscillator is based on the mechanical oscillations of a crystal, and the frequency of such oscillations depends on the size: if the crystal is made smaller, its frequency will increase above the desired value.

The new device uses a graphene sheet about a micrometer in size. It is the basis of the oscillatory system, which provides the generation of a signal of a given (carrier) frequency. Under the action of another, modulating, signal (for example, sound), the frequency of the carrier oscillations changes in proportion to the applied voltage, and due to this, a signal is transmitted at a frequency much higher than the original one. The scientists demonstrated the operability of the circuit at room temperature, and also showed the possibility of modulating a graphene oscillatory circuit with an audio frequency signal.

Currently, graphene is attracting the attention of many research groups around the world. In early November, for example, engineers from the Gwangju University of Technology in Korea unveiled a graphene-based ionistor that is almost as good as lithium-ion batteries. The main obstacle to the widespread introduction of a new material is the lack of a proven technology for obtaining it in a sufficiently pure form.

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