Abstract
Controlling infrasound signals is crucial to many processes ranging from predicting atmospheric events and seismic activities to sensing nuclear detonations. These waves can be manipulated through phononic crystals and acoustic metamaterials. However, at such ultra-low frequencies, the size (usually on the order of meters) and the mass (usually on the order of many kilograms) of these materials can hinder its potential applications in the infrasonic domain. Here, we utilize tunable lattices of repelling magnets to guide and sort infrasound waves into different channels based on their frequencies. We construct our lattices by confining meta-atoms (free-floating macroscopic disks with embedded magnets) within a magnetic boundary. By changing the confining boundary, we control the meta-atoms’ spacing and therefore the intensity of their coupling potentials and wave propagation characteristics. As a demonstration of principle, we present the first experimental realization of an infrasound phonon demultiplexer (i.e., guiding ultra-low frequency waves into different channels based on their frequencies). The realized platform can be utilized to manipulate ultra-low frequency waves, within a relatively small volume, while utilizing negligible mass. In addition, the self-assembly nature of the meta-atoms can be key in creating re-programmable materials with exceptional nonlinear properties.
Highlights
Infrasound waves are ubiquitous in nature, appearing in animal communications (von Muggenthaler et al, 2003; Barklow, 2004; Von Muggenthaler, 2013), natural phenomena such as earthquakes and volcanic eruptions (Garcés et al, 2003; Fee and Matoza, 2013; Nakano et al, 2018; Ripepe et al, 2018), and man made systems such as machinery and explosions
Phononic crystals and acoustic metamaterials, defined as artificial arrangements of spatial patterns, can manipulate waves at different frequency ranges from a few Hertz to a few Terahertz (Deymier, 2013; Maldovan, 2013; Hussein et al, 2014; Khelif and Adibi, 2015)
The wave controlling characteristics of phononic crystals and acoustic metamaterials have a variety of potential applications, including vibration and sound insulation (Yang et al, 2010; Mei et al, 2012; Ma et al, 2015), seismic wave protection (Kim and Das, 2012; Brulé et al, 2014), wave guiding (Torres et al, 1999; Rupp et al, 2007), frequency
Summary
Infrasound waves are ubiquitous in nature, appearing in animal communications (von Muggenthaler et al, 2003; Barklow, 2004; Von Muggenthaler, 2013), natural phenomena such as earthquakes and volcanic eruptions (Garcés et al, 2003; Fee and Matoza, 2013; Nakano et al, 2018; Ripepe et al, 2018), and man made systems such as machinery and explosions. Phononic crystals and acoustic metamaterials, defined as artificial arrangements of spatial patterns, can manipulate waves at different frequency ranges from a few Hertz to a few Terahertz (Deymier, 2013; Maldovan, 2013; Hussein et al, 2014; Khelif and Adibi, 2015). The wave controlling characteristics of phononic crystals and acoustic metamaterials have a variety of potential applications, including vibration and sound insulation (Yang et al, 2010; Mei et al, 2012; Ma et al, 2015), seismic wave protection (Kim and Das, 2012; Brulé et al, 2014), wave guiding (Torres et al, 1999; Rupp et al, 2007), frequency
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