High frequency SAW devices based on third harmonic generation.

Area of Science:

• Materials Science
• Electrical Engineering
• Acoustics

Background:

• Surface Acoustic Wave (SAW) devices are crucial for high-frequency applications.
• Traditional SAW device fabrication often requires high lithography resolution.
• Integrating SAW devices with other electronics on a single wafer presents fabrication challenges.

Purpose of the Study:

• To demonstrate third harmonic generation in ZnO/Si layered structures for high-frequency SAW devices.
• To investigate the theoretical dispersion curves of phase velocity and electromechanical coupling coefficient (K(2)) for surface acoustic waves.
• To enable easier integration of SAW devices and electronics on the same wafer.

Main Methods:

• Fabrication of ZnO/Si layered structures.
• Theoretical analysis to determine phase velocity and electromechanical coupling coefficient (K(2)) dispersion curves.
• Design and measurement of a SAW filter for third harmonic generation.

Main Results:

• Successful demonstration of third harmonic generation in ZnO/Si layered structures.
• Theoretical dispersion curves for phase velocity and K(2) were obtained.
• Experimental results from a SAW filter validated the theoretical predictions, achieving operating frequencies up to 2468 MHz.

Conclusions:

• ZnO/Si layered structures are effective for high-frequency SAW device generation via third harmonic generation.
• This approach simplifies fabrication by eliminating the need for high lithography resolution.
• The proposed method facilitates seamless integration of SAW devices with electronics on a single wafer.