Remote whispering metamaterial for non-radiative transceiving of ultra-weak sound.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 34135332.
- Also identified by DOI 10.1038/s41467-021-23991-3 and PMC identifier 8208968.
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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 non-radiative sound transfer over distances hundreds times longer than the radius of the meta-cavities, 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.