NANOSYSTEMS: PHYSICS, CHEMISTRY, MATHEMATICS, 2013, 4 (5), P. 630–634
SURFACE ACOUSTIC WAVE FERROELECTRIC PHONONIC CRYSTAL TUNABLE BY ELECTRIC FIELD
V.P. Pashchenko – Saint Petersburg State Polytechnical University, Saint Petersburg, Russia; Avangard JSC, Saint Petersburg, Russia; v.paschenko@gmail.com
Theoretical investigation results of the periodic domain structures induced by an electric field in barium strontium titanate (BaxSr1-x)TiO3 ferroelectric thin film are presented. A novel type of tunable phononic crystal based on an electric field-induced piezoelectric effect in a thin ferroelectric film is proposed. Surface acoustic wave propagation equations for the substrate under electric field-induced periodic domains are derived. Finite element simulation revealed the possibility of applying the ferroelectric phononic crystal as an electrically tunable surface acoustic wave filter.
Keywords: tunable phononic crystal, induced piezoeffect, surface acoustic wave (SAW), periodic domains, ferroelectric film.
PACS 81.05.Xj, 78.67.Pt