High-frequency shear-horizontal surface acoustic wave sensor
| DWPI Title: Shear-horizontal surface acoustic love-wave sensor for detecting biological chemical analytes in liquid, has unidirectional receiving interdigital transducer for detecting guided love-wave transmitted through sensing region on guiding layer |
| 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: High frequency microfabricated biological shear-horizontal leaky surface acoustic love-wave sensor for detecting/sensing pathogenic microorganisms and bioagents/biological chemical analytes in fluid i.e. liquid. |
| Advantage: The unidirectional IDT on the piezoelectric substrate generates leaky surface acoustic wave with low propagation losses and bulk wave interferences to provide highly linear phase response and to eliminate a need for impedance matching, thus enabling efficient excitation of the shear-horizontal waves on the LTO giving the highly linear phase response, where the LTO can prevent excessive wave damping of the sensor without any insertion losses and with high out-of-band rejection to enable high sensitivity detection of the analytes in the fluid while suppressing bulk wave excitation at a sensor stop band. The sensor effectively and rapidly detects the pathogenic microorganisms and bioagents/biological chemical analytes in the fluid through binding to a chemically sensitive interface by using field deployable platforms. |
| Novelty: The sensor (10) has a guiding layer (13) placed on a substrate (12) including lower shear velocity than the substrate for confinement of a shear-horizontal wave on the substrate as a guided love-wave (14). A unidirectional receiving interdigital transducer (IDT) (30) detects the love-wave transmitted through a sensing region on the layer, where a transmitting IDT (20) and the IDT include a cell including excitation and reflection electrode fingers whose spacings are optimized to excite/detect horizontal waves that are in-phase along transducer length in presence of the layer and the region. |
| Filed: 5/1/2013 |
| Application Number: US13874692A |
| Tech ID: SD 10720.1 |
| 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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