  Photon-phonon coupling holds strong potential for sound and temperature
control with light, opening new horizons in detector technology, remote sound
generation and signal broadcasting. Here, we report on a novel stereoscopic
ultralight converter based on a three dimensional graphene structure 3G-sponge,
which exhibits very high absorption, near-to-air density, low inertia, and
negligible effective heat capacity. We studied the heat and sound generation
under the excitation of electromagnetic waves. 3G-sponge shows exceptional
photon to heat and sound transduction efficiency over an enormous frequency
range from MHz to PHz. As an application, we present an audio receiver based on
a 3G-sponge amplitude demodulation. Our results will lead to a wide range of
applications from light-controlled sound sources to broadband high-frequency
graphene electronics.
