Theoretical and experimental analyses of tunable fabry-perot resonators using piezoelectric phononic crystals
作者： Marie-fraise Ponge , Bertrand Dubus , Christian Granger , Jerome O. Vasseur , Mai Pham Thi
DOI: 10.1109/TUFFC.2014.006919
关键词: Piezoelectricity 、 Electromechanical coupling coefficient 、 Band gap 、 Antiresonance 、 Transducer 、 Materials science 、 Coupling coefficient of resonators 、 Resonator 、 Optics 、 Boundary value problem
摘要: Theoretical and experimental analyses of piezoelectric stacks submitted to periodical electrical boundary conditions via electrodes are conducted. The presented structures exhibit Bragg band gaps that can be switched on or off by setting in short open circuit. gap frequency width is determined the electromechanical coupling coefficient. This property used design a Fabry-Perot cavity delimited periodic stack. An analytical model based transfer matrix formalism wave propagation inside structure. resonance tunability obtained varying length (i.e., spatially shifting stack). 26% tuning antiresonance frequencies with almost constant coefficient 5% theoretically predicted for an NCE41 resonator. To optimize device, influence various parameters investigated. length, phononic crystal (number unit cells), transducer position adapted tune shift When located at nodal plane cavity, value 30%. Experimental results discussed analyzing effects damping.
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