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Fabrication of Surface Acoustic Wave Devices on Lithium Niobate
Published on: June 18, 2020
Experimental study of acoustical memory in lithium niobate
Dao Zhou1, Xiaozhou Liu, Xiufen Gong
1Key Laboratory of Modern Acoustics, Ministry of Education, Institute of Acoustics, Nanjing University, Nanjing 210093, People's Republic of China.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|September 4, 2008
Summary
This study explores the acoustical memory effect in LiNbO3, revealing nonclassical nonlinear properties. Higher temperatures enhance the acoustical memory signal amplitude, with signal shape changes observed under specific conditions.
Area of Science:
- Solid-state physics
- Acoustics
- Materials science
Background:
- The acoustical memory effect is a phenomenon where acoustic signals can be stored and retrieved in materials.
- Lithium niobate (LiNbO3) is a widely used material in various electronic and optical applications, but its nonlinear properties are not fully understood.
- Understanding nonlinear acoustic phenomena in LiNbO3 is crucial for developing advanced acoustic devices.
Purpose of the Study:
- To investigate the acoustical memory effect in LiNbO3 across a frequency range of 2.5 to 10 MHz.
- To explore the influence of temperature and driving voltage on the acoustical memory signal.
- To identify the underlying mechanisms responsible for the observed acoustical memory phenomena.
Main Methods:
- Experimental measurements of the acoustical memory effect in columnar and cubic LiNbO3 samples.
- Varying experimental parameters such as frequency (2.5-10 MHz), temperature, driving voltage, and burst cycles.
- Analysis of amplitude hysteresis and signal shape changes in the acoustical memory response.
Main Results:
- The acoustical memory effect was observed in both columnar and cubic LiNbO3 samples.
- Amplitude hysteresis of the acoustical memory signal indicates nonclassical nonlinear properties, attributed to structural inhomogeneity and flaws.
- Increasing temperature enhances the acoustical memory signal amplitude.
- High driving voltage or sufficient burst cycles lead to changes in signal shape, including the appearance of second and third signal parts.
- Amplitude hysteresis was also observed for the fundamental and second harmonic of the direct wave.
Conclusions:
- The study confirms the presence of the acoustical memory effect in LiNbO3 and highlights its complex nonlinear behavior.
- Structural inhomogeneity and material flaws play a significant role in the observed acoustical memory phenomena.
- Temperature and driving conditions are critical factors influencing the characteristics of the acoustical memory signal in LiNbO3.
