Zusammenfassung Es wird ein physikalisches und methodisches Konzept vorgeschlagen, das auf der Anwendung eines phononischen Kristalls zur Manipulation Detektion heterogener Flüssigkeit in einem Kanal basiert. Der phononische Kristall wurde aus Edelstahlblock mit einer periodischen Struktur zylindrischen Löchern hergestellt. Ein Defekt Form flüssigkeitsgefüllten Kanals die Mitte des gelegt. Die ...

The effective operation of certain electronic, medical, industrial, and testing equipment relies on high-quality focusing imaging capability, which also plays a vital role in the field wave physics. Therefore, continuously improving resolution capacity is essential. However, homogeneous medium dominated by diffraction limit, best for could only reach half wavelength corresponding to lowest oper...

The localization of elastic wave at defect in phononic crystals (PnCs) has been applied to design piezoelectric energy harvesting (PEH) devices. However, the earlier researches were based on classical linear elasticity theory, which failed predict structural behavior micron scale. Based a modified couple stress theory (MCST) and mixed finite element method, physics builder COMSOL® Multiphysics ...

Underwater ultrasonic transmissions for fluid-solid and air-solid phononic brass plates are reported in this work. Although the structure is roughly the same, experimental results show very different behaviour between fluid-solid and air-solid phononic plates, due to most of the properties of the fluid-solid perforated plates rely on Fabry-Perot resonances, Wood anomalies and Lamb modes. In air...

We present examples of phononic structures that beak four types of symmetry, namely timereversal symmetry, parity symmetry, chiral symmetry and particle-hole symmetry. The implications of symmetry breaking on the topology of the acoustic wave function in the space of its Eigen values are discussed. Particular attention is focused on the torsional topology of acoustic waves in periodic media in ...