Acoustic Wave Filter Based on Periodically Poled Lithium Niobate

E. Courjon (1) , F. Bassignot (1) , G. Ulliac (1) , S. Ballandras (1)

1 FEMTO-ST - Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174)

We present results on the development of an acoustic bandpass filter based on periodically poled ferroelectric domains in lithium niobate. The fabrication of Periodically Poled Transducers (PPT) operating in the range 20 - 650 MHz has been achieved on a 3 '' 500 mu m thick wafer. This kind of transducer enables to excite elliptical as well as longitudinal modes, yielding phase velocity of about 3800 and 6500 m. s(-1) respectively. We propose then a new type of acoustic bandpass filter based on the use of PPTs instead of classical IDTs. The design and the fabrication of such a filter are presented as well as the experimental measurements. Finally we demonstrate the feasibility of such a PPTs-based filter.

Domaines: Optique / photonique

E. Courjon, F. Bassignot, G. Ulliac, S. Ballandras. Acoustic Wave Filter Based on Periodically Poled Lithium Niobate. Joint Conference on IEEE International Symposium on Applications of Ferroelectrics (ISAF/PFM)/ International Symposium on Piezoresponse Force Microscopy and Nanoscale Phenomena in Polar Materials, Jul 2011, Vancouver, Canada. pp.1-4, ⟨10.1109/ISAF.2011.6014161⟩. ⟨hal-00651288⟩