Refraction close refractionProcess by which a wave changes speed and sometimes direction upon entering a denser or less dense medium, eg a light ray changes direction when refracted by a lens.

The diagram below shows a water wave reflected ... of the waves passing through causes a lot of spreading, eg sound waves passing through a doorway. A gap width much larger than the wavelength ...

By containing the sound wave on the surface of a chip, it can more easily interact with the environment, making it a perfect candidate for advanced sensing technologies. The findings are published ...