• Thomas Pastureaud, Marc Solal, Béatrice Biasse, Bernard Aspar, Jean-Bernard Briot, William Daniau, William Steichen, Raphaël Lardat, Vincent Laude, Alain Laëns, Jean-Michel Friedt, and Sylvain Ballandras.
• TEMEX, F-06904 Sophia-Antipolis Cedex, France.
• IEEE Trans Ultrason Ferroelectr Freq Control. 2007 Apr 1; 54 (4): 870-6.

AbstractThe need for high-frequency, wide-band filters has instigated many developments based on combining thin piezoelectric films and high acoustic velocity materials (sapphire, diamond-like carbon, silicon, etc.) to ease the manufacture of devices operating above 2 GHz. In the present work, a technological process has been developed to achieve thin-oriented, single-crystal lithium niobate (LiNbO3) layers deposited on (100) silicon wafers for the fabrication of radio-frequency (RF) surface acoustic wave (SAW) devices. The use of such oriented thin films is expected to favor large coupling coefficients together with a good control of the layer properties, enabling one to chose the best combination of layer orientation to optimize the device. A theoretical analysis of the elastic wave assumed to propagate on such a combination of material is first exposed. Technological aspects then are described briefly. Experimental results are presented and compared to the state of art.

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