We demonstrate a wideband electrostatic graphene microphone displaying flat frequency response over the entire human audible region as well as into the ultrasonic regime. Using the microphone, low-level ultrasonic bat calls are successfully recorded. The microphone can be paired with a similarly constructed electrostatic graphene loudspeaker to create a wideband ultrasonic radio.
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Authors
Qin Zhou
Department of Physics, University of California, Berkeley, CA 94720, USA
Department of Physics, University of California - Berkeley
Seita Onishi
Department of Physics, University of California, Berkeley, CA 94720, USA
Department of Physics, University of California - Berkeley
Alex Zettl
Dept. of Physics, Univ of California - Berkeley; Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley;
Physics Department, COINS, UC Berkeley. Kavli Energy NanoSciences Institute, UC Berkeley, Materials Science Division, Lawrence Berkeley National Lab
UC Berkeley, Materials Sciences Division, Lawrence Berkeley National Laboratory, Kavli Energy NanoSciences Institute at UC Berkeley
Department of Physics, University of California - Berkeley
UC Berkeley
Department of Physics, University of California at Berkeley; Materials Sciences Division, Lawrence Berkeley National Laboratory
