A Switchable Demultiplexer utilizing Magnetic-Based Phononic Crystal Configuration

Abstract

Abstract This study presents a novel approach to achieve a controllable demultiplexer by applying a magnetic field in a solid-solid phononic crystal structure. The proposed phononic crystal structure consists of a square lattice made of tungsten cylinders embedded in a PMMA substrate. The switchable demultiplexer is composed of two identical but symmetrical parts, with an input waveguide separating them. Each unit comprises an output channel and a common input channel, with output channels side-coupled by a ring resonator to the input bus waveguide. The operating frequency range of the demultiplexer is in the MHz regime. The switchability of this elastic demultiplexer is achieved by dynamically controlling Young's modulus. By applying a magnetic field to the structure, the Young's modulus of the Terfenol-D material used in the output waveguide is altered, allowing for controllability. The proposed demultiplexer demonstrates an average crosstalk value of -12.65 dB, indicating suitable performance, along with a high average quality factor (Q) of 1870. The solid-solid elastic structure is simulated using the finite element method.