Politecnico di Torino - Corso Duca degli Abruzzi, 24 - 10129 Torino, ITALY

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Graphene based transducer for electromagnetic and thermo-acoustic waves

EarphoneGrafeneGrapheneLoudspeakermicrowaveThermoacoustic device


The present invention consists in the use of an innovative material (3-dimensional graphene) for the transduction of electromagnetic waves into acoustic and ultrasonic waves. The detectors available on the market can cover limited frequency ranges and often use complex transduction systems, significantly affecting the construction costs.

Technical features

The transduction mechanism is based on the photo-thermo-acoustic effect in which the electromagnetic radiation is effectively absorbed and converted into thermal and acoustic waves by the proposed material based on three-dimensional graphene. Given the very low heat capacity of graphene compared to conventional materials, the absorbed electromagnetic energy creates a thermal gradient producing a consequent air pressure wave that surrounds the device. This material shows a very high efficiency of photo-thermo-acoustic transduction over a large portion of the electro-magnetic spectrum from microwaves to ultraviolet. The invention consists of a scheme based on an innovative material (3D Graphene) for the direct transduction of electro-magnetic waves into acoustic thermal waves with very high efficiency and can be used for the realization of very high fidelity acoustic and ultrasonic sources guided by waves. electromagnetic and light and by detectors of electromagnetic radiation operating from micro-waves to ultraviolet.

Possible Applications

  • Development of new acoustic and ultrasonic sources guided by electromagnetic and light waves;
  • Field of music and entertainment systems;
  • Medical field and ocean-chart;
  • Development of electromagnetic radiation detectors for a wide spectrum of frequencies by coupling this scheme to a microphone operating in the acoustic or ultrasonic band.


  • Simple process;
  • Easy availability of the material;
  • Acoustic band generated;
  • Excellent performance, lower costs compared to terahertz and microwave detectors on the market;
  • The photo-thermo-acoustic transduction at the base of the detection scheme makes the detector extremely linear.