By Richard V. Craster, Sébastien Guenneau
In regards to the booklet: This ebook is the 1st accomplished evaluation on acoustic metamaterials; novel fabrics which could control sound waves in fantastic methods, which come with collimation, focusing, cloaking, sonic screening and impressive transmission. It covers either experimental and theoretical points of acoustic and elastic waves propagating in dependent composites, with a spotlight on powerful homes linked to adverse refraction, lensing and cloaking. such a lot similar books within the box tackle electromagnetic metamaterials and concentrate on numerical tools, and little (or no) experimental part. each one bankruptcy might be authored by way of an said professional, among the subjects lined can be experimental effects on non-destructive imaging, cloaking by means of floor water waves, flexural waves in skinny plates. functions in scientific ultrasound imaging and modeling of metamaterials should be emphasised too. The booklet can function a reference for researchers who desire to construct an excellent origin of wave propagation during this classification of novel fabrics.
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Additional info for Acoustic Metamaterials: Negative Refraction, Imaging, Lensing and Cloaking (Springer Series in Materials Science)
These fibres guide the light in a unique way: instead of channelling the light by using a stepped refractive index 34 S. V. Craster Fig. 1 inside each inclusion and μe = 1 in the matrix. 49 associated with a Mie resonance (the acoustic and optical bands are dispersionless for wavenumbers outside the range [−1, 1] and the optical band has a negative group velocity for wavenumbers in the range [−1, 1]. Similar features can be seen for higher bands, but the associated stop bands are very narrow gradient, the fibre itself contains inhomogeneities which are used to trap light in a central core.
J. Solids Struct. 35, 3239 (1998) 3. : Homogenization of Maxwell’s equations in a split ring geometry. Multiscale Model. Simul. 8(3), 717–750 (2010) 4. : Achieving control of in-plane elastic waves. Appl. Phys. Lett. 94, 061903 (2009) 5. : Dynamics of structural interfaces: Filtering and focussing effects for elastic waves. J. Mech. Phys. Solids 58, 1212–1224 (2010) 1 Fundamentals of Acoustic Metamaterials 41 6. : Finite checkerboards of dissipative negative refractive index. Opt. Express 14, 12950 (2006) 7.
The only case whereby the field is constant in the core region and oscillating in the thin bridges is in panel (a): this is the hallmark of a locally resonant structure Fig. 12 Numerical simulation demonstrating the imaging effect for anti-plane shear waves in an isotropic elastic medium: (a) An acoustic source placed on the left side of an array of rigid cylinders (with cross-sections shaped as split ring resonators (SRRs)) is imaged on the right side (with subwavelength resolution). e. at intersection between blue dotted lines (sound cone) and second dispersion curve.