SURFACE TRANSVERSE-WAVES ON LANGASITE

Surface transverse waves (STW) are numerically simulated on langasite. As our method of investigation, we compute the admittance of an infin ite synchronous resonator. The resonance and antiresonance frequencies are evaluated as functions of the crystal cut, temperature, and the t hickness of the aluminium electrodes. For optimal parameters, we demon strate a vanishing first-order temperature coefficient at room tempera ture and find a coupling strength several times stronger than that for Rayleigh waves in ST quartz. In particular, we find that the sensitiv ity of the resonance frequency to variations in the thickness of the a luminium electrodes is significantly lower in langasite than in ST qua rtz. (C) 1998 American Institute of Physics.