Animation of an acoustic wave launched in an acoustic waveguide formed by a high tensile stress silicon nitride membrane on a silicon chip. The acoustic wave is generated electrostatically through the force between an electrode patterned on the chip (gold) and an electrode hovering above the chip (silver sphere). Motion of the membrane can be read out interferometrically with high precision (red laser). Animation credit: N. Mauranyapin. More at Phononics Research.
