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Coupling electro-mechanical behaviors in the interdigital electrode device of ferroelectrics

Acta Mechanica Sinica 2021年第4期37卷 649-661,I0003页

作者： Suxin Pan Shilin Xie Qun Li State Key Laboratory for Strength and Vibration of Mechanical Structures Xi’an Jiaotong UniversityXi’an 710049China

The electro-mechanical coupling behaviors of ferroelectric devices with interdigital electrodes may become complicated due to the material inhomogeneity and local field concentration under the complex working *** this paper,a ferroelectric model,drawn from the typical interdigital electrode structure of a ferroelectric sensor,is established based on phase field theory,to study the polarization evolution and explore the evolution laws in *** results show that there appears ferroelectric creep even under an applied electric field below the coercive field ***,the configurational force theory is introduced to investigate the mechanical behaviors related to polarization switching in the ferroelectric samples with interdigital *** is found that configurational force and polarization have similar evolution laws in both time evolving and space *** considering the configurational force as the driving force,it is possible to predict the potential direction of polarization evolution and explore its evolution mechanism in ferroelectrics,demonstrating the configurational force as a useful parameter for describing mechanical behavior during the polarization evolution and a powerful tool for investigating the evolution mechanism of microstructure with coupling effects in ferroelectric materials.

关键词： Phase field modeling Configurational force polarization evolution Domain switching Interdigital electrode

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Phase and direction dependence of photorefraction in a low-frequency strong circular-polarized plane wave

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Chinese Physics B 2015年第5期24卷 335-339页

作者：黄永盛王乃彦汤秀章 High Power KrF Excimer Laser Laboratory China Institute of Atomic Energy

Contrary to the superposition principle, it is well known that photorefraction exists in the vacuum with the presence of a strong static field, a laser field, or a rotational magnetic field. Different from the classical optical crystals, the refractive index also depends on the phase of the strong electromagnetic field. We obtain the phase and direction dependence of the refractive index of a probe wave incident in the strong field of a circular-polarized plane wave by solving the Maxwell equations corrected by the effective Lagrangian. It may provide a valuable theoretical basis to calculate the polarization evolution of waves in the strong electromagnetic circumstances of pulsar or neutron stars.

关键词： phase and direction dependence circular-polarized plane wave refractive index polarization evolution

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