High-frequency shear-horizontal surface acoustic wave sensor

Patent · Tue Mar 11 04:00:00 EDT 2014

OSTI ID:1126694

Branch, Darren W

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 (.about.300-400 MHz) surface acoustic wave (SAW) transducer enables efficient excitation of shear-horizontal waves on 36.degree. Y-cut lithium tantalate (LTO) giving a highly linear phase response (2.8.degree. P-P). The sensor has the ability to detect at the pg/mm.sup.2 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.

• Research Organization: SNL-A (Sandia National Laboratories, Albuquerque, NM (United States))
• Sponsoring Organization: USDOE
• DOE Contract Number: AC04-94AL85000
• Assignee: Sandia Corporation (Albuquerque, NM)
• Patent Number(s): 8,669,688
• Application Number: 13/874,692
• OSTI ID: 1126694
• Country of Publication: United States
• Language: English

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