Acoustic wave device comprising alternating polarisation...

Details Acoustic wave device comprising alternating polarisation... Acoustic wave device comprising alternating polarisation...

H - Electricity

03

H

H03H 9/02 (2006.01) H03H 9/145 (2006.01)

Patent

CA 2384275

The invention concerns an acoustic wave device comprising a ferroelectric material layer (C) and a substrate. The invention is characterised in that the ferroelectric material is interposed between a first electrode (E1) deposited at the substrate surface or constituting the substrate and a second electrode (E2) and the ferroelectric material layer comprises first positive polarisation domains (D1) and second negative polarisation domains (D2). For applications in the field of surface wave transducers, structures can be advantageously produced with pitch domain inversion of the order of several hundreds of nanometers, adapted to high frequency applications (of the order of one Giga-Hertz).

L'invention concerne un dispositif à ondes acoustiques comprenant une couche de matériau ferroélectrique (C) et un substrat (S), caractérisé en ce que la couche de matériau ferroélectrique est comprise entre une première électrode (E1) déposée à la surface du substrat ou constitutive du substrat et une deuxième électrode (E2) et en ce que la couche de matériau ferroélectrique comprend des premiers domaines de polarisation positive (D1) et des seconds domaines de polarisation négative (D2). Pour des applications dans le domaine des transducteurs à ondes de surface on peut avantageusement réaliser des structures avec inversion de domaines de pas de l'ordre de quelques centaines de nanomètres, adaptées à des applications hautes fréquences (de l'ordre du Giga Hertz).

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