Lateral-field-excitation properties of LiNbO3 single crystal
Wang Wen-Yan(王文炎)a), Zhang Chao(张超)b)†, Zhang Zhi-Tian(张志甜)a), Liu Yan(刘岩)b), and Feng Guan-Ping(冯冠平)a)b)
a Department of Precision Instruments and Mechanology, Tsinghua University, Beijing 100084, China; b Center for Information and Optomechatronics, Research Institute of Tsinghua University in Shenzhen, Shenzhen 518057, China
Abstract LiNbO$_{3}$ has been found attractive for lateral field excitation (LFE) applications due to its high piezoelectric coupling. In this paper, bulk acoustic wave propagation properties for LiNbO$_{3}$ single crystal excited by a lateral electric field have been investigated using the extended Christoffel--Bechmann method. It is found that the LFE piezoelectric coupling factor for $c$ mode reaches its maximum value of 95.46{\%} when $\psi = 0^\circ$ for both (yxl)-58$^\circ$ and (yxwl)$\pm 60^\circ/58^\circ$ LiNbO$_{3}$. The acoustic wave phase velocity of $c$ mode TSM (thickness shear mode) changes from 3456 m/s to 3983 m/s as a function of $\psi$. Here $\psi$ represents the angle between the lateral electric field and the crystallographic $X$-axis in the substrate major surface. A 5 MHz LFE device of (yxl)-58$^\circ$ LiNbO$_{3}$ with $\psi=0^\circ$ was designed and tested in air. A major resonance peak was observed with the motional resistance as low as 17 ${\rm \Omega}$ and the $Q$-factor value up to 10353. The test result is well in agreement with the theoretical analysis, and suggests that the LFE LiNbO$_{3}$ device can be a good platform for high performance resonator or sensor applications.
Received: 09 August 2008
Revised: 17 September 2008
Accepted manuscript online:
PACS:
77.65.Dq
(Acoustoelectric effects and surface acoustic waves (SAW) in piezoelectrics)
Fund: Project supported by the National
Natural Science Foundation of China (Grant No 60571014).
Cite this article:
Wang Wen-Yan(王文炎), Zhang Chao(张超), Zhang Zhi-Tian(张志甜), Liu Yan(刘岩), and Feng Guan-Ping(冯冠平) Lateral-field-excitation properties of LiNbO3 single crystal 2009 Chin. Phys. B 18 795
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