This study introduces the complete investigation and design procedure of a two-dimensional fluid/fluid phononic crystal structure that operates as an acoustic wave demultiplexer and switch. The designed phononic crystal is made of a periodic array – consisting ethyl nonafluorobutyl ether cylindrical rods - embedded in a mercury background. Also, presented demultiplexer-switch structure includes four different cavities, which have improved dual separating and switching performances. The finite element method has been used to calculate the designed phononic crystal band diagrams and corresponding transmission spectrums. The acoustic demultiplexer can also operate as ultrasonic wave switch, as a result of the proposed structure material dependence to temperature. To the best of our knowledge, this is the first two-dimensional fluid/fluid phononic crystal structure proposed for ultrasonic switch-demultiplexer dual applications with temperature control.

本研究介绍了用作声波解复用器和开关的二维流体/流体声子晶体结构的完整研究和设计过程。设计的声子晶体由嵌入汞背景中的周期性阵列（由乙基九氟丁基醚圆柱棒组成）制成。而且，提出的解复用器-开关结构包括四个不同的腔，它们具有改进的双重分离和切换性能。有限元法已用于计算设计的声子晶体能带图和相应的透射谱。由于所提出的结构材料对温度的依赖性，声解复用器也可以用作超声波开关。据我们所知，