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This paper has analyzed the relationship between the distribution of displacement vectors and the properties of corresponding line defect waveguide within the band gaps of PCs. In order to obtain the band gaps of PCs, a delay line model was built. Through simulating this model by finite element method, the displacement vectors in PCs also can be obtained. To analyze the properties of corresponding...
This paper has studied the influence of filling fraction on the band gaps of two-dimensional (2-D) piezoelectric phononic crystals (PnCs) in radio frequency (RF). The 2-D piezoelectric PnCs consists of tungsten (W) stubs on the finite slab of 128°YXLiNbO3 substrate. With Bloch periodic theorem, the single cell model was built using the three-dimensional (3-D) finite element method (FEM). Based on...
Carbon black combined PDMS is a promising material for laser ultrasonic inspection but the generated ultrasound field characteristics have not been studied. To obtain the wave field generated by laser in the polymer material, thermo-elasticity model was adopted, a 2D axial symmetry finite element model is built and the physics and parameters are set as actual situation for ultrasonic wave generation...
This paper has proposed a weighted waveguide for surface acoustic waves (SAW) based on two-dimensional piezoelectric phononic crystals (PnCs). In order to analyze the transmission of the weighted waveguide based on PnCs, SAW delay line model was built. In the model, period boundary condition was adopted to reduce the time and memory of model cost and perfect matching layer was adopted to absorb the...
The impacts of two immobilization methods, which are Biotin-avidin system (BAS) and Self-assembled monolayer technology (SAM), made on the performance of aptasensors in terms of acoustics were analyzed through experiment. Love-wave aptasensors were designed by coupling aptamers to the surface of a Love-wave sensor with the two methods respectively. Abrin is chosen as the analyte. For certain concentrations...
The paper introduces a rigorous numerical model to analyze SAW (surface acoustic wave) resonators by BEM (boundary element method). At first it is proposed that the mass-loading effect of electrode is neglected and the surface of substrate is free, and the substrate is semi-infinite. Then corresponding programs are developed to analyze a SAW resonator. Electrical charge distribution on the electrode-substrate...
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