Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 112, Issue 29, Pages 8942-8946Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1505800112
Keywords
radio; ultrasonics; graphene; microphone; bat
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Funding
- Office of Energy Research, Office of Basic Energy Sciences, Materials Sciences and Engineering Division, US Department of Energy [DE-AC02-05CH11231]
- Office of Naval Research [N00014-09-1066]
- National Science Foundation [EEC-083819]
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We present a graphene-based wideband microphone and a related ultrasonic radio that can be used for wireless communication. It is shown that graphene-based acoustic transmitters and receivers have a wide bandwidth, from the audible region (20 similar to 20 kHz) to the ultrasonic region (20 kHz to at least 0.5 MHz). Using the graphene-based components, we demonstrate efficient high-fidelity information transmission using an ultrasonic band centered at 0.3 MHz. The graphene-based microphone is also shown to be capable of directly receiving ultrasound signals generated by bats in the field, and the ultrasonic radio, coupled to electromagnetic (EM) radio, is shown to function as a high-accuracy rangefinder. The ultrasonic radio could serve as a useful addition to wireless communication technology where the propagation of EM waves is difficult.
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