Development and Characterization of a Superresolution Ultrasonic Transducer.

Highly sensitive ultrasound probes are needed to expand the capabilities of biomedical ultrasound and industrial nondestructive testing (NDT). Pursuing better imaging quality, while keeping fabrication costs low, is an important trend in the current development of ultrasound imaging systems. In this article, we report the development and characterization of an ultrasonic transducer that (super)focuses ultrasonic waves beyond the so-called diffraction limit, that is, the beamwaist is roughly narrower than one wavelength.