1. Low-Loss Unidirectional Acoustic Focusing Transducer in Thin-Film Lithium Niobate.
- Author
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Lu, Ruochen, Yang, Yansong, and Gong, Songbin
- Subjects
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ACOUSTIC transducers , *DELAY lines , *INSERTION loss (Telecommunication) , *LITHIUM niobate , *MICROELECTROMECHANICAL systems , *ENHANCED magnetoresistance , *TRANSDUCERS - Abstract
In this work, we present gigahertz low-loss unidirectional acoustic focusing transducers in thin-film lithium niobate. The design follows the anisotropy of fundamental symmetric (S0) waves in X-cut lithium niobate. The implemented acoustic delay line testbed consisting of a pair of the proposed transducers shows a low insertion loss of 4.2 dB and a wide fractional bandwidth of 7.5% at 1 GHz. The extracted transducer loss is 1.46 dB, and the propagation loss of the S0 waves is 0.0126 dB/ $\mu \text{m}$. The design framework is readily extendable to other acoustic modes, given consideration on the optimal orientation for power flow and electromechanical transduction. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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