Abstract
Thickness extension mode excited by electric field across the thickness of piezoelectric substrate has long been used for various applications. In the present study, the properties of thickness extension mode excited by lateral electric field on LiTaO 3 have been investigated using the extended Christoffel-Bechmann method. It is found that the Lateral field excitation (LFE) coupling factors for a-mode (quasi-extensional mode) reaches its maximum value of 17.4% on X-cut LiTaO 3 . The characteristics of an LFE device made of X-cut LiTaO 3 have been investigated and the LFE device was used for the design of a high frequency ultrasonic transducer. The characteristic of the LiTaO 3 LFE ultrasonic transducer was analyzed with the traditional KLM model and tested using traditional pulse/echo method. A LiTaO 3 LFE ultrasonic with the center frequency of 33.18MHz and the −6dB bandwidth of 29.99% was acquired, which was well in agreement with the results of the KLM model. Further analysis suggests that the LiTaO 3 LFE device has great potential in the design of broadband high frequency ultrasonic transducers.
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