High-frequency shear-horizontal surface acoustic wave sensor
| DWPI Title: Shear-horizontal surface acoustic wave sensor for rapid autonomous detection of e.g. pathogenic microorganisms, has finger spacings optimized to excite or detect shear-horizontal waves that are in-phase along length of transducers |
| Abstract: A Love wave sensor uses a single-phase unidirectional interdigital transducer (IDT) on a piezoelectric substrate for leaky surface acoustic wave generation. The IDT design minimizes propagation losses, bulk wave interferences, provides a highly linear phase response, and eliminates the need for impedance matching. As an example, a high frequency (~300-400 MHz) surface acoustic wave (SAW) transducer enables efficient excitation of shear-horizontal waves on 36° Y-cut lithium tantalate (LTO) giving a highly linear phase response (2.8° P-P). The sensor has the ability to detect at the pg/mm2 level and can perform multi-analyte detection in real-time. The sensor can be used for rapid autonomous detection of pathogenic microorganisms and bioagents by field deployable platforms. |
| Use: Shear-horizontal surface acoustic wave (SAW) sensor i.e. shear-horizontal SAW love wave sensor, for rapid autonomous detection of pathogenic microorganisms and bioagents by field deployable platforms. |
| Advantage: The IDT comprises EWC-SPUDT cells and a reflection grating so as to achieve low insertion loss and high out-of-band rejection while minimizing bulk wave excitation at the stop band. The design of the IDT minimizes propagation losses, bulk wave interferences, provides highly linear phase response and eliminates the need for impedance matching. The sensor has the ability to detect at the pg per square mm level, and can perform multi-analyte detection in real-time. |
| Novelty: The sensor (10) has a unidirectional receiving interdigital transducer (IDT) (30) detecting guided love wave (14) that is transmitted through a liquid-interface sensing region (15). The IDT and a unidirectional transmitting IDT (20) comprise an electrode-width-controlled single-phase unidirectional transducer (EWC-SPUDT) including a EWC-SPUDT cell. Finger spacings are optimized to excite or detect shear-horizontal waves that are in-phase along length of each transducer in the presence of a thin guiding layer (13) and the sensing region. |
| Filed: 7/8/2008 |
| Application Number: US2008169239A |
| Tech ID: SD 10720.0 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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