中国物理B ›› 2010, Vol. 19 ›› Issue (9): 97701-097701.doi: 10.1088/1674-1056/19/9/097701
张志甜1, 马廷锋1, 张超2, 王文炎2, 刘岩2, 冯冠平2
Zhang Zhi-Tian(张志甜)a), Zhang Chao(张超)b)†, Wang Wen-Yan(王文炎)b), Ma Ting-Feng(马廷锋)a), Liu Yan(刘岩) b), and Feng Guan-Ping(冯冠平)b)
摘要: This paper investigates the properties of thickness extension mode excited by lateral electric field on LiNbO3 by using the extended Christoffel--Bechmann method. It finds that the lateral field excitation coupling factor for a-mode (quasi-extensional mode) reaches its maximum value of 28% on X-cut LiNbO3. The characteristics of a lateral field excitation device made of X-cut LiNbO3 have been investigated and the lateral field excitation device is used for the design of a high frequency ultrasonic transducer. The time and frequency domain pulse/echo response of the LiNbO3 lateral field excitation ultrasonic transducer is analysed with the modified Krimholtz--Leedom--Matthae model and tested using traditional pulse/echo method. A LiNbO3 lateral field excitation ultrasonic transducer with the centre frequency of 33.44 MHz and the --6 dB bandwidth of 33.8% is acquired, which is in good agreement with the results of the Krimholtz--Leedom--Matthae model. Further analysis suggests that the LiNbO3 lateral field excitation device has great potential in the design of broadband high frequency ultrasonic transducers.
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