Simulation of characteristics of a LiNbO(3)/diamond surface acoustic wave

Simulation of characteristics of a LiNbO(3)/diamond surface acoustic wave

High-frequency surface acoustic wave (SAW) devices based on diamond that have been produced to date utilize the SiO(2)/ZnO/diamond structure, which shows excellent characteristics of a phase velocity of over 10,000 m/s with a zero temperature coefficient; this structure has been successfully applied...

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Veröffentlicht in:IEEE transactions on ultrasonics, ferroelectrics, and frequency control ferroelectrics, and frequency control, 2004-10, Vol.51 (10), p.1308-1313
Hauptverfasser: Shikata, S-I, Hachigo, A, Nakahata, H, Narita, M
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container_title IEEE transactions on ultrasonics, ferroelectrics, and frequency control
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creator Shikata, S-I
Hachigo, A
Nakahata, H
Narita, M
description High-frequency surface acoustic wave (SAW) devices based on diamond that have been produced to date utilize the SiO(2)/ZnO/diamond structure, which shows excellent characteristics of a phase velocity of over 10,000 m/s with a zero temperature coefficient; this structure has been successfully applied to high-frequency narrowband filters and resonators. To expand material systems to wideband applications, c-axis-oriented LiNbO(3) on diamond was studied and a coupling coefficient up to 9.0% was estimated to be obtained. In this paper, the characteristics of LiNbO(3)/diamond with the assumption that the LiNbO(3) film is a single crystal have been studied by theoretical calculations to find higher coupling coefficient conditions. Calculations are made for the phase velocity, the coupling coefficient, and the temperature coefficient of the Rayleigh wave and its higher mode Sezawa waves. As a result, LiNbO(3)/diamond is found to offer a very high electromechanical coupling coefficient of up to 16% in conjunction with a high phase velocity of 12,600 m/s and a small temperature coefficient of 25 ppm/deg. This characteristic is suitable for wide bandwidth applications in high-frequency SAW devices.
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To expand material systems to wideband applications, c-axis-oriented LiNbO(3) on diamond was studied and a coupling coefficient up to 9.0% was estimated to be obtained. In this paper, the characteristics of LiNbO(3)/diamond with the assumption that the LiNbO(3) film is a single crystal have been studied by theoretical calculations to find higher coupling coefficient conditions. Calculations are made for the phase velocity, the coupling coefficient, and the temperature coefficient of the Rayleigh wave and its higher mode Sezawa waves. As a result, LiNbO(3)/diamond is found to offer a very high electromechanical coupling coefficient of up to 16% in conjunction with a high phase velocity of 12,600 m/s and a small temperature coefficient of 25 ppm/deg. 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