Title :
4G-3 Guided Surface Acoustic Waves in Phononic Crystal Waveguides
Author :
Wu, Tsung-Tsong ; Sun, Jia-Hong
Author_Institution :
Inst. of Appl. Mech., National Taiwan Univ., Taipei
Abstract :
In this paper, we adopt the finite-difference time-domain method to analyze surface acoustic waves propagating in two-dimensional phononic waveguides. A phononic crystal consisting of circular steel cylinders which form a square lattice in an epoxy matrix is considered as an example to study phononic crystal waveguides. The dispersion relation and displacement fields are calculated to identify the band gaps and eigenmodes. The result shows the existence of a complete band gap of surface waves and thus an acoustic waveguide is created accordingly. Eigenmodes of surface waves inside the waveguide are indicated and pseudo surface acoustic waves propagating inside the straight waveguide are demonstrated. Further, the waveguides with a sharp bend are reported and an improved design is suggested to enhance energy transmission
Keywords :
acoustic wave propagation; acoustic waveguides; eigenvalues and eigenfunctions; finite difference time-domain analysis; lattice dynamics; phononic crystals; surface acoustic waves; 2D phononic waveguides; dispersion relation; displacement fields; energy transmission enhancement; epoxy matrix; finite difference time domain method; guided surface acoustic waves; phononic crystal waveguides; pseudo-SAW propagation; steel cylinder square lattice; surface acoustic wave propagation; surface wave band gaps; surface wave eigenmodes; Acoustic propagation; Acoustic waveguides; Acoustic waves; Finite difference methods; Lattices; Photonic band gap; Steel; Surface acoustic waves; Time domain analysis; Transmission line matrix methods;
Conference_Titel :
Ultrasonics Symposium, 2006. IEEE
Conference_Location :
Vancouver, BC
Print_ISBN :
1-4244-0201-8
Electronic_ISBN :
1051-0117
DOI :
10.1109/ULTSYM.2006.183
