A bulk wave piezoelectric transducer operating at a predetermined frequency f and comprising: a block of substrate (4; 64; 74), as holding means, with a plane face having a first thickness e1 along a normal to the plane face and consisting in a first material, and a piezoelectric transduction plate (6; 36; 66; 76) having first and second plane faces (8,10) positioned facing each other, having a length L, a width I and a second thickness e2, and consisting in a second piezoelectric material, first and second metal electrodes (12,14;42,44;54,56) covering at least partly the first face and the second face of the piezoelectric transduction plate (6; 36; 66; 76) respectively and at least partly facing each other, wherein the piezoelectric transduction plate (6; 36; 66; 76) is formed by a ferroelectric material layer which comprises first domains with a positive polarization and second domains with a negative polarization, the first domains and the second domains being distributed in the direction of the length L of the piezoelectric transduction plate alternately according to a repetition pattern, the repetition pattern being defined by a pitch p and a cyclic ratio, and the piezoelectric transduction plate (6; 36; 66; 76) is attached perpendicularly in the vicinity of the plane face of the block of substrate (4; 64; 74) so that the width of the piezoelectric transduction plate (6; 36; 66; 76) and the first thickness of the block of substrate (4; 64; 74) have a same direction, and the first material, the second material, the first thickness of the block of substrate (4; 64; 74), the length L, the width I, the second thickness e2 of the piezoelectric transduction plate (6; 36; 66; 76), the pitch p are configured in order to generate and trap bulk waves at the operating frequency of the transducer, which are guided between the two plane faces of the piezoelectric transduction plate, the guided acoustic waves propagating in the direction of the length L of the transduction plate (6; 36; 66; 76). a block of substrate (4; 64; 74), as holding means, with a plane face having a first thickness e1 along a normal to the plane face and consisting in a first material, and a piezoelectric transduction plate (6; 36; 66; 76) having first and second plane faces (8,10) positioned facing each other, having a length L, a width I and a second thickness e2, and consisting in a second piezoelectric material, first and second metal electrodes (12,14;42,44;54,56) covering at least partly the first face and the second face of the piezoelectric transduction plate (6; 36; 66; 76) respectively and at least partly facing each other, wherein the piezoelectric transduction plate (6; 36; 66; 76) is formed by a ferroelectric material layer which comprises first domains with a positive polarization and second domains with a negative polarization, the first domains and the second domains being distributed in the direction of the length L of the piezoelectric transduction plate alternately according to a repetition pattern, the repetition pattern being defined by a pitch p and a cyclic ratio, and the piezoelectric transduction plate (6; 36; 66; 76) is attached perpendicularly in the vicinity of the plane face of the block of substrate (4; 64; 74) so that the width of the piezoelectric transduction plate (6; 36; 66; 76) and the first thickness of the block of substrate (4; 64; 74) have a same direction, and the first material, the second material, the first thickness of the block of substrate (4; 64; 74), the length L, the width I, the second thickness e2 of the piezoelectric transduction plate (6; 36; 66; 76), the pitch p are configured in order to generate and trap bulk waves at the operating frequency of the transducer, which are guided between the two plane faces of the piezoelectric transduction plate, the guided acoustic waves propagating in the direction of the length L of the transduction plate (6; 36; 66; 76).