Lateral field excitation properties of langasite single crystal

doi:10.1088/1674-1056/19/8/087701

中国物理B ›› 2010, Vol. 19 ›› Issue (8): 87701-087701.doi: 10.1088/1674-1056/19/8/087701

Lateral field excitation properties of langasite single crystal

张超¹, 江小宁², 马廷锋³, 冯冠平³

(1)Center for Information and Optomechatronics, Research Institute of Tsinghua University in Shenzhen, Shenzhen 518057, China; (2)Department of Mechanical & Aerospace Engineering, North Carolina State University, Raleigh, NC 27695-7910, USA; (3)Department of Precision Instruments and Mechanology, Tsinghua University, Beijing 100084, China

收稿日期:2010-01-21 修回日期:2010-03-03 出版日期:2010-08-15 发布日期:2010-08-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 60571014).

Lateral field excitation properties of langasite single crystal

Ma Ting-Feng(马廷锋)^a), Zhang Chao(张超)^b)†, Feng Guan-Ping(冯冠平)^a)b), and Jiang Xiao-Ning(江小宁)^c)

^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; ^c Department of Mechanical & Aerospace Engineering, North Carolina State University, Raleigh, NC 27695-7910, USA

Received:2010-01-21 Revised:2010-03-03 Online:2010-08-15 Published:2010-08-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 60571014).

摘要/Abstract

摘要： In this work, bulk acoustic wave propagation properties of langasite single crystal excited by lateral electric field have been investigated. Three important crystal cuts have been identified for different operational modes of lateral field excitation (LFE) on langasite substrate, namely the (yxl)65o (pure-LFE mode), (yxl)45o (quasi-LFE mode), and (yxl)0o (pseudo-LFE mode). Devices on langasite substrate with the above cuts were fabricated and tested, and the experimental results agree well with the theoretical analysis. It is found that a pure thickness shear mode exists in the (yxl)65o langasite LFE device with the bare side facing liquid, and no spurious mode is found due to its moderately large piezoelectric coupling factor. In addition, (yxl)0o langasite LFE device is also found suitable for liquid phase sensing applications.

Abstract: In this work, bulk acoustic wave propagation properties of langasite single crystal excited by lateral electric field have been investigated. Three important crystal cuts have been identified for different operational modes of lateral field excitation (LFE) on langasite substrate, namely the (yxl)65°(pure-LFE mode), (yxl)45°(quasi-LFE mode), and (yxl)0°(pseudo-LFE mode). Devices on langasite substrate with the above cuts were fabricated and tested, and the experimental results agree well with the theoretical analysis. It is found that a pure thickness shear mode exists in the (yxl)65°langasite LFE device with the bare side facing liquid, and no spurious mode is found due to its moderately large piezoelectric coupling factor. In addition, (yxl)0°langasite LFE device is also found suitable for liquid phase sensing applications.

Key words: lateral field excitation, langasite, bulk acoustic wave

中图分类号: (Acoustical properties of solids)

62.65.+k

07.07.Df (Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing) 85.50.-n (Dielectric, ferroelectric, and piezoelectric devices)

马廷锋, 张超, 冯冠平, 江小宁. Lateral field excitation properties of langasite single crystal[J]. 中国物理B, 2010, 19(8): 87701-087701.

Ma Ting-Feng(马廷锋), Zhang Chao(张超), Feng Guan-Ping(冯冠平), and Jiang Xiao-Ning(江小宁). Lateral field excitation properties of langasite single crystal[J]. Chin. Phys. B, 2010, 19(8): 87701-087701.

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Lateral field excitation properties of langasite single crystal

Lateral field excitation properties of langasite single crystal

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