公开(公告)号：US3699482A

公开(公告)日：1972-10-17

申请号：US3699482D

申请日：1971-06-30

Applicant: IBM

Inventor： ASH ERIC A ,  TSENG SAMUEL C-C

IPC: H03H9/02 ,  H03H9/42 ,  H03H9/76 ,  H03H7/36 ,  H03H9/30

CPC classification number: H03H9/76 ,  H03H9/02543 ,  H03H9/42

Abstract: A surface waveguide structure and method of making same. A substrate material consisting either of a piezoelectric ceramic or ferroelectric crystal, is selectively poled by an electric field so as to form an elastic surface wave channel within the substrate structure. The electric field applied cross the substrate causes a polarization of the crystalline structure in those areas influenced by the electric field and has a negligible effect in those areas not exposed to the electric field. The free surface wave velocity is substantially increased in the polarized areas of the substrate and remains unchanged in the unpolarized regions. Poling of the substrate is accomplished by applying an electric field across a pair of electrodes which cover the upper and lower surfaces of the substrate except for a narrow region between the transmitting and receiving surface wave transducers. The process for manufacturing the surface waveguide structure is applicable to both acoustic and optical surface waveguiding devices. Also, the polarization of the substrate may be selectively altered by subsequent application of electric fields across the body of the substrate to make switchable waveguide regions.

Abstract translation: 表面波导结构及其制造方法。 由压电陶瓷或铁电晶体组成的衬底材料通过电场选择性地极化，以在衬底结构内形成弹性表面波通道。 施加的电场穿过衬底会在受电场影响的那些区域中引起晶体结构的极化，并且在不暴露于电场的那些区域中具有可忽略的影响。 在衬底的极化区域中，自由表面波速度显着增加，并且在非偏振区域中保持不变。 通过在覆盖基板的上表面和下表面的一对电极之间施加电场，除了发射和接收表面波换能器之间的窄区域外，实现基板的极化。