Magnetically controlled three-channel phononic switch
Farzaneh Motaei, Ali Bahrami, Habib Badri Ghavifekr
Abstract
This study includes the design procedure of a novel three-channel switch based on solid–solid phononic crystals. This elastic switch is externally controlled by the magnetic field. Proposed 1 × 3 switch is designed using Young’s modulus variations (ΔE effect) of magnetostrictive materials due to change in the magnetic field intensity. The change in the elastic constant shifts the defect mode frequency position. A fundamental phenomenon in this switch is the major frequency shift, which is equal to 100 kHz for Terfenol-D Young’s modulus reduction of 18%. It should be noted that this frequency shift occurs in presented phononic structure with a lattice constant equals to 500 μm. The major frequency shift is due to Terfenol-D high sensitivity to the magnetic field and using the hollow cylinders in output waveguides of structure. The elastic switch simulation is accomplished by finite element method. The crosstalk worst case in the proposed switch is −17 dB, which shows the device suitable performance.