Title :
Modal analysis and cut-off conditions of multichannel surface-acoustic-waveguide structures
Author :
Griffel, G. ; Golan, G. ; Ruschin, Shlomo ; Seidman, A. ; Croitoru, Natan
Author_Institution :
Dept. of Electron. Devices & Mater. & Electromagn. Radiat., Tel Aviv, Israel
fDate :
7/1/1988 12:00:00 AM
Abstract :
Multichannel guides for surface acoustic waves can improve the efficiency of SAW (surface acoustic-wave) devices significantly. Focusing, steering, and modulating the propagating acoustical modes can be achieved similarly to optical waveguided devices. A general formulation is presented for the analysis of the lateral waveguiding properties of Rayleigh modes in surfaces loaded with deposited strips of different materials. General expressions are obtained for the number of modes and cutoff conditions in these structures. As examples of applications, a simple directional coupler and an electrically controlled coupler are proposed.<>
Keywords :
acoustic waveguides; surface acoustic wave devices; Rayleigh modes; SAW; acoustical modes; cut-off conditions; directional coupler; multichannel surface-acoustic-waveguide structures; Acoustic propagation; Acoustic waves; Modal analysis; Optical devices; Optical modulation; Optical propagation; Optical surface waves; Optical waveguides; Surface acoustic wave devices; Surface acoustic waves;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
