Lateral-field-excitation properties of LiNbO3 single crystal

doi:10.1088/1674-1056/18/2/064

Abstract

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

ψ = 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

ψ

. Here

ψ

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

ψ = 0^{\circ}

was designed and tested in air. A major resonance peak was observed with the motional resistance as low as 17

Ω

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.

Keywords: lateral-field-excitation LiNbO₃ piezoelectric coupling factor acoustic wave phase velocity

Received: 09 August 2008
Revised: 17 September 2008
Accepted manuscript online:

PACS:	77.65.Dq	(Acoustoelectric effects and surface acoustic waves (SAW) in piezoelectrics)
	77.22.Ch	(Permittivity (dielectric function))
	62.65.+k	(Acoustical properties of solids)

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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