Properties study of LiNbO3 lateral field excited device working on thickness extension mode

doi:10.1088/1674-1056/19/9/097701

Abstract 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.

Keywords: lateral field excitation high frequency ultrasonic transducer LiNbO₃ thickness extension mode

Received: 16 December 2009
Revised: 24 March 2010
Accepted manuscript online:

PACS:	7760
	4388

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 60571014) and Shenzhen Shuangbai Project.

Cite this article:

Zhang Zhi-Tian(张志甜), Zhang Chao(张超), Wang Wen-Yan(王文炎), Ma Ting-Feng(马廷锋), Liu Yan(刘岩), and Feng Guan-Ping(冯冠平) Properties study of LiNbO₃ lateral field excited device working on thickness extension mode 2010 Chin. Phys. B 19 097701

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Properties study of LiNbO3 lateral field excited device working on thickness extension mode

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Properties study of LiNbO₃ lateral field excited device working on thickness extension mode