Ultrasonic transducer

An ultrasonic transducer for transmitting and receiving an ultrasonic wave,

• the ultrasonic transducer comprising:
• an energy conversion layer having a first surface and a second surface that are opposite to each other, wherein the energy conversion layer includes a piezoelectric material layer, the piezoelectric material layer has a first groove, the first groove extends along a first direction, and the first direction is parallel to a thickness direction of the piezoelectric material layer;
• and
• an acoustic lens layer disposed on the first surface, wherein the acoustic lens layer has a curved surface, the curved surface extends along a second direction, the second direction is parallel to a width direction of the piezoelectric material layer, and the first groove is oriented toward the acoustic lens layer;
• wherein a first coordinate point is defined at a location on the first surface that corresponds to the first groove, the first coordinate point corresponds to a focal point on the curved surface along the first direction, and a distance between the first coordinate point and the focal point is equal to an integer multiple of half a wavelength of a center frequency of the ultrasonic wave.