Over the past ten years, electromagnetic metamaterials have become ubiquitous in modern photonics research, following Pendry's proposal of a perfect flat lens via negative refraction at the turn of the millennium, and the related development of invisibility cloaks. These two paradigms have their counterparts in another emerging subject of wave motion: Acoustic metamaterials, which are locally resonant structures displaying an effective macroscopic behaviour (such as a negative density) beyond Newton's second law. Applications of acoustic metamaterials range from non-invasive probing and high-resolution tomography in medical imaging, to acoustic camouflaging and seismic protection.

The twelve chapters constituting this book present an up-to-date survey of many aspects of acoustic metamaterials, including filtering effects, extraordinary transmission, subwavelength imaging via tomography or time-reversal techniques, cloaking via transformation acoustics and elastodynamics and even cloaking via acoustic scattering cancellation and active exterior cloaking. It is hoped that the variety of subjects touched upon in this book, and the ways in which they can be treated theoretically, numerically and experimentally give a grasp of the richness of the emerging topic of acoustic metamaterials and will contribute to initiate even more research activity and applications in the near future.

The book will be a valuable reference for postgraduate students, lecturers and researchers working on acoustic metamaterials and the wider field of wave phenomena.

Résumé
About the book: This book is the first comprehensive review on acoustic metamaterials; novel materials which can manipulate sound waves in surprising ways, which include collimation, focusing, cloaking, sonic screening and extraordinary transmission. It covers both experimental and theoretical aspects of acoustic and elastic waves propagating in structured composites, with a focus on effective properties associated with negative refraction, lensing and cloaking. Most related books in the field address electromagnetic metamaterials and focus on numerical methods, and little (or no) experimental section. Each chapter will be authored by an acknowledged expert, amongst the topics covered will be experimental results on non-destructive imaging, cloaking by surface water waves, flexural waves in thin plates. Applications in medical ultrasound imaging and modeling of metamaterials will be emphasized too. The book can serve as a reference for researchers who wish to build a solid foundation of wave propagation in this class of novel materials.

Contenu

Preface.- 1 Fundamentals of acoustic metamaterials.- 2 Locally resonant structures for low frequency surface acoustic band gap applications.- 3 Band-gap properties of prestressed structures.- 4 Ultrasound transmission through periodically perforated plates.- 5 Novel Ultrasound Imaging Applications.- 6 Subwavelength focussing in metamaterials using far field time reversal.- 7 Anisotropic metamaterials for transformation acoustics and imaging.- 8 Transformation Acoustics.- 9 Acoustic Cloaking Via Homogenization.- 10 Acoustic Cloaking with Plasmonic Shells.- 11 Cloaking Liquid Surface Waves and Plasmon Polaritons.- 12 Transformation elastodynamics and active exterior acoustic cloaking.