Lateral field excitation properties of langasite single crystal |
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Authors: | Ma Ting-Feng Zhang Chao Feng Guan-Ping Jiang Xiao-Ning |
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Affiliation: | Department of Precision Instruments and Mechanology, Tsinghua University, Beijing 100084, China; Center for Information and Optomechatronics, Research Institute of Tsinghua University in Shenzhen, Shenzhen 518057, China; Department of Mechanical & Aerospace Engineering, North Carolina State University, Raleigh, NC 27695-7910, USA |
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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)65circ (pure-LFE mode), (yxl)45circ (quasi-LFE mode), and (yxl)0circ (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)65circ 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)0circ langasite LFE device is also found suitable for liquid phase sensing applications. |
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Keywords: | lateral field excitation langasite bulk acoustic wave |
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