Theoretical demonstration of the hybrid focusing points of sonic crystal flat lenses and possible applications

Abstract

We demonstrate the hybrid focusing points of sonic crystals for a multi-source array applied to flat sonic crystal lenses. The contributions of different point source couples form hybrid focusing points. Ray-trace analyses are conducted for acoustic flat lenses with multi-source configurations. The finite-difference time-domain (FDTD) simulation of flat lenses with multi-source configurations demonstrates the establishment of pure and hybrid focusing points in a pyramidal constellation. The number of focusing points in the pyramidal constellation depends on the number of point sources. We propose an acoustic device for fine-tuning the location of a far-field hybrid focusing point and discuss its benefits for acoustic energy focusing application.

Negative refractions by triangular lattice sonic crystals in partial band gaps

“…Research on standalone SC structures has been reported for many useful acoustic devices. [1,6,7,11,42,43] However, sophisticated acoustic functions to perform more advanced tasks are made possible by a large scale integration of standalone acoustic structures. For instance, underpinning technologies with their potential applications in communication and acoustic imaging were found to be useful for integrating the microphononic crystal devices.…”

Homogenization theory for designing graded viscoelastic sonic crystals

“…[1][2][3][4] Many acoustic devices have been designed and they demonstrate an extensive application prospect, such as filters, sound barriers, waveguides, etc. [5][6][7][8][9][10][11] But realistic structures are dissipative and have losses. Transmission of twodimensional (2D) VSC has been investigated theoretically and experimentally.…”