In yet another first for graphene, physicists from the University of California, Berkeley, have employed this versatile material to create ultra-thin, lightweight ultrasonic microphones and speakers that enable high-quality, two-way communication in the audio range normally used by the likes of bats and dolphins.
The graphene diaphragms created especially for these new devices are just one atom thick, and combine the stiffness, suppleness, and low inertia that give them the capability to respond at an enormous range of frequencies and, according to the researchers, provide a flat frequency response across the entire audible spectrum.
via Gizmag
