Changes in refractive index due to surface acoustic waves
The interaction of surface acoustic wave and light wave is to realize the conversion between mechanical motion and electromagnetic field motion. Using the piezoelectric performance equation connecting the two motion forms, and considering the quasi-electric field approximation and Newton's second law of motion in continuous medium, the acoustic surface can be obtained Basic equation of wave
Where uj is the particle displacement vector; cijkl is the elastic stiffness coefficient tensor; ekij is the piezoelectric coefficient tensor; and εik is the dielectric coefficient.
The plane wave solution of equation (2) does not satisfy the boundary conditions. If the amplitude does not attenuate with depth, it is not a surface acoustic wave, so its amplitude must have a certain lateral distribution, so consider the following types of solutions
Theoretical analysis of mode conversion efficiency in collinear acousto-optic effect
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