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Abstract
This paper demonstrates a passive remote-whispering metamaterial (RWM) that significantly enhances weak airborne sound at audible frequencies without altering the ambient soundscape. The RWM uses a pair of self-resonating subwavelength Mie meta-cavities, analogous to Förster resonance energy transfer, to achieve efficient non-radiative sound transfer over distances far exceeding the meta-cavities' radius. This enables the recovery of weak sound signals masked by strong noise, improving the signal-to-noise ratio from -3 dB below the detection limit to 17.7 dB.
Publisher
Nature Communications
Published On
Jun 16, 2021
Authors
Jin Zhang, Wei Rui, Chengrong Ma, Ying Cheng, Xiaojun Liu, Johan Christensen
Tags
metamaterial
airborne sound
signal enhancement
noise reduction
non-radiative sound transfer

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