设计了一种集成的声学器件 .它的基本结构是由下列 3部分组成的 ,即换能器部分、声学开关部分和声传播介质部分 ,但其材料均来源于铌酸锂晶体 .其中换能器与声开关部分是由声学超晶格铌酸锂构成的 ,而声的传播介质则是单畴铌酸锂 .着重研究了声开关部分所外加的直流偏压对在该器件中传播的声波的影响 .结果显示 :声开关部分对声波的反射率受到这一外加偏压大小的影响 ,外加偏压越大 ,则反射率越强 ;声子带隙也受到外加偏压的影响 ,外加偏压越大 ,则声子带隙将会增宽 .同时我们还发现了声开关的反射谱分布决定于铌酸锂超晶格的周期大小 ,且超晶格周期数的减小也会增宽声子带隙 .该器件在设计上有两大优点 :一是实现了声学开关器件的集成化 ,二是充分利用了声学超晶格铌酸锂最大的机电耦合系数 An integrated acoustic device is designed and its basic structure is composed of the following three parts: the transducer part, the acoustic switch part and the acoustic propagation medium part, but the materials are all from the lithium niobate crystal, The part of the device and the acoustic switch is made of acoustic superlattice lithium niobate, while the acoustic medium of propagation is a single domain of lithium niobate. Emphasis is placed on the effect of the DC bias applied to the acoustic switch on the sound wave propagating in the device The results show that the reflectivity of the acoustic switch is affected by the magnitude of the applied bias voltage. The larger the applied bias voltage is, the stronger the reflectivity is. The phonon band gap is also affected by the applied bias voltage. The larger the pressure, the wider the phonon bandgap will be, and we also find that the spectral distribution of the acoustic switch is determined by the period of the lithium niobate superlattice and the reduction of the number of superlattice cycles is also broadened Phonon bandgap. The device has two major advantages in design: First, to achieve the integration of acoustic switching devices, the second is to take full advantage of the acoustic superlattice lithium niobate maximum electromechanical coupling coefficient