| 摘要 |
Devices are disclosed for controlling high frequency signals by the generation of surface skimming bulk waves (SSBWs). The devices include: (a) a bulk crystalline substrate of MTiOXO4 (M is K, Rb, Tl, Cs, and/or NH4 and X is P and/or As) having mm<2> crystal symmetry and a planar-cut surface; (b) an input interdigital transducer (IDT) deposited on a signal receiving area of the substrate surface, suitable for connection to a source of electric signal and for inverse piezoelectrically generating in-plane polarized surface skimming bulk waves having a velocity in the substrate of between about 4200 m/s and 7000 m/s; (c) a second IDT deposited on a signal sending area of the substrate surface suitable for piezoelectrically generating electric output signals from said surface skimming bulk waves; and (d) an electric signal responsive device which is operably connected to the second IDT and responds to the electric output signals. Also disclosed are a method of controlling frequency of electric signals which involves piezoelectrically converting the signals into SSBWs in a substrate of MTiOXO4 and piezoelectrically detecting SSBWs from said substrate, and a method of fluid sensing with involves piezoelectrically converting input electric signals into SSBWs in a substrate of MTiOXO4 in contact with the fluid and piezoelectrically detecting from the substrate SSBWs which have been transmitted past the fluid.
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