1. Free standing and solidly mounted Lamb wave resonators based on Al0.85Sc0.15N thin film.
- Author
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Parsapour, Fazel, Pashchenko, Vladimir, Chambon, Hugo, Nicolay, Pascal, Bleyl, Ingo, Roesler, Ulrike, and Muralt, Paul
- Subjects
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MICRORESONATORS (Optoelectronics) , *LAMB waves , *THIN films , *RESONANCE , *FINITE element method , *PIEZOELECTRICITY - Abstract
Lamb wave microresonators with wavelengths λ of 5–8 μm, vibrating in the S0 mode, and having 75 electrode pairs were fabricated and characterized. The results were compared to theoretical predictions obtained by finite element simulation. The active material was a 1 μm-thick Al0.85Sc0.15N thin film. Two types of acoustic isolation solutions were implemented: the first one with freestanding plates fixed by two bridges to a device frame [freestanding Lamb wave resonator (FS-LWR)] and the second one containing an acoustic W/SiO2 5-layer reflector [solidly mounted Lamb wave resonator (SM-LWR)]. All devices showed excellent agreement with FEM predictions, regarding resonance frequency and piezoelectric coupling. The quality factors of the SM-LWR devices were 5–6 times larger than the ones of the freestanding structures fabricated by the same Al0.85Sc0.15N deposition process: we achieved a figure of merit of 12–18 (Qp = 771, Qs = 507, k2 = 2.29%) at an operation frequency of 1430 MHz, which is so far the best performance realized with a MEMS Lamb wave resonator having a large number of electrode fingers. This performance opens up perspectives for filter applications. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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