Graphene electrostatic microphone and ultrasonic radio

We have previously demonstrated an electrostatically driven graphene diaphragm loudspeaker with an equalized frequency response across the whole human audible region

Qin Zhou; Jinglin Zheng; Seita Onishi; M. F. Crommie; Alex K. Zettl

2015

Scholarcy highlights

  • We present a graphene-based wideband microphone and a related ultrasonic radio that can be used for wireless communication
  • The ultrasonic band, though having a wide frequency span and often free of disturbance, is rarely exploited for high data rate communication purposes; one possible reason for this is the lack of wide bandwidth ultrasonic generators and receivers
  • Conventional piezoelectric-based transducers only operate near their resonance frequencies, preventing use in communications where wider bandwidth is essential for embedding information streams
  • We find that the graphene microphone has an outstanding equalized frequency response covering at least 20 Hz to 0.5 MHz, and a sensitivity sufficient to record bats echolocating in the wild
  • We find that an improved low-frequency response can readily be achieved by attaching an acoustic cavity to one side of the microphone electrodes
  • The bat frequency sweeping or chirping represents a form of ultrasonic FM radio transmission, and its successful recording demonstrates the effectiveness of the graphene microphone as an ultrasonic radio receiver
  • An electrostatic graphene acoustic radio is demonstrated with ideal equalized frequency response from at least 20 Hz to 0.5 MHz. The receiver component has been independently field-tested in recording wild bat calls

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