Piezoelectric Resonance Defined High Performance Sensors and Modulators
Technical Report,15 Feb 2012,14 Feb 2016
University of Texas at San Antonio San Antonio United States
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Electromechanical resonance of piezoelectric crystals has been shown to have substantial influence on their electrooptic interactions and is of significant interests for a wide range of public or DoD-applications. This project explored the mechanisms of enhanced electro-optic interactions at high frequencies, established essential understandings on lattice-polarization process by successfully conducted a family of experimental measurements combined with computational modeling. Ferroelectric crystals such as PMN-PT,PZN-PT, LiNbO3 were studied. Electro-optic, mechanical vibration and admittance experiments verified the high degree of coupling available as a result of synchronized crystal vibration. High frequency vibrometry showed that piezoelectric resonance induced strain continues to have influences over the optical signal propagation despite of its apparent mechanical clamping. Multiphysics COMSOL FEA models were constructed to simulate the crystal vibration, admittance spectrum, linear electro-optic effect, photoelastic effect, and optical wave propagation. These numerical models complemented the observed experimental results and provided new insights into the dynamic nature of the induced periodic displacement current in a resonating sample. Time domain simulations verified the possibility of broad bandwidth enhancement by A C resonance biasing. The influence of periodic gradient structure on the enhancement of microwave transmission was predicted and validated in terahertz spectroscopy experiments conducted using LiNbO3 single crystals.