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The common behavior of a wave is determined by wave parameters of its medium,which are generally associated with the characteristic oscillations of itscorresponding elementary particles. In the context of metamaterials, thedecoupled excitation of these fundamental oscillations would provide an idealplatform for top-down and reconfigurable access to the entire space ofconstitutive wave parameters; however, this has remained as a conceivableproblem that must be accomplished, after being pointed out by Pendry. Here, byfocusing on acoustic metamaterials, we achieve the decoupling of density $\rho$, modulus B$^{-1}$, and bianisotropy {\xi} near the Dirac point, by separatingthe paths of particle momentum to conform to the characteristic oscillations ofeach macroscopic wave parameter. Independent access to all octants of waveparameter space ($\rho$ , B$^{-1}$, $\xi$) = (+/-,+/-,+/-) is thus realizedusing a single platform that we call an omni meta-atom; as a building blockthat achieves top-down access to the target properties of metamaterials. Withprecision access to the target ($\rho$ , B$^{-1}$, $\xi$ ), we also propose abianisotropic meta-surface for independent shaping of transmission- andreflection-wave fronts, and a zero-index anisotropic waveguide forpressure-velocity conversion.

Acoustic omni meta-atom for top-down, decoupled access to all octants of a wave parameter space