Publication: Remote whispering metamaterial for non-radiative transceiving of ultra-weak sound
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2021-06-16
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Springer Science and Business Media LLC
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Abstract
Transceiving ultra-weak sound typically relies on signal pre-amplification at the transmitting
end via active electro-acoustic devices, which inherently perturbs the environment in the
form of noise that inevitably leads to information leakage. Here we demonstrate a passive
remote-whispering metamaterial (RWM) enabling weak airborne sound at audible frequencies
to reach unprecedented signal enhancement without altering the detected ambient
soundscape, which is based on the extraordinary scattering properties of a metamaterial
formed by a pair of self-resonating subwavelength Mie meta-cavities, constituting the
acoustic analogy of Förster resonance energy transfer. We demonstrate efficient nonradiative
sound transfer over distances hundreds times longer than the radius of the metacavities,
which enables the RWM to recover weak sound signals completely overwhelmed by
strong noise with enhanced signal-to-noise ratio from −3 dB below the detection limit of 0 dB
in free space to 17.7 dB.