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Chin. Phys. B, 2010, Vol. 19(8): 087701    DOI: 10.1088/1674-1056/19/8/087701
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

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
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.
Keywords:  lateral field excitation      langasite      bulk acoustic wave  
Received:  21 January 2010      Revised:  03 March 2010      Accepted manuscript online: 
PACS:  62.65.+k (Acoustical properties of solids)  
  07.07.Df (Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing)  
  85.50.-n (Dielectric, ferroelectric, and piezoelectric devices)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 60571014).

Cite this article: 

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 2010 Chin. Phys. B 19 087701

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