Special Issue "Phononics"
Deadline for manuscript submissions: closed (15 December 2017) | Viewed by 45430
Interests: acoustic metamaterials; phononic crystals; acoustic device
The study of the interaction of acoustic waves with periodic structures has a long history: The first investigations can be found in one of the pioneering contributions of Lord Rayleigh, back in 1887, and the study of vibrations in crystals is at the core of solid state physics, and is as topical as ever, despite it being a century-old, discipline.
More than two decades ago, inspired by the rise and success of photonic crystals, vibrations in periodic structures were considered anew, giving birth to the field of Phononic Crystals. By engineering artificial materials, particularly by tuning their mechanical properties in a periodic, crystal-like fashion, unique dispersion characteristics can be found that cannot be observed in bulk counterparts. Periodicity can lead to acoustic or elastic band gaps due to Bragg scattering; introduction of defects has led to demonstrations of strong wave localization in cavities or waveguides; dispersion engineering has opened the path towards slow sound, sub-wavelength focusing or self-collimation. The physics of phononic crystals have been further enriched by the concept of locally-resonant crystals, where the resonance properties of the scattering unit play the leading role in band gap formation, bringing the characteristic dimensions of the crystal to a sub-wavelength scale.
The capacity to control of elastic or acoustic waves has then attained an unprecedented level. Phononics has now reached some degree of maturity, providing a wide range of opportunities in different domains of applications. The very nature of elastic and acoustic waves, their natural extension over a widest scale of wavelength and hence frequencies, promise as many potential fields of use for phononic crystals, ranging from structural vibrations to radio-frequency telecommunications, through micro-electromechanical systems and ultrasound acoustics, to name but a few.
This Special Issue of Crystals, therefore, intends to give some of the most important advances in the field of phononics in the last few years, providing a state-of-the-art of the field from material, device, and application perspectives.
Dr. Abdelkrim Khelif
Dr. Sarah Benchabane
Manuscript Submission Information
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Phononic band gaps, cavities and waveguides
Micro and nano resonators