Thin film bulk acoustic wave sensor suite
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United States of America Patent
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Mar 20, 2007
Grant Date -
N/A
app pub date -
Mar 11, 2005
filing date -
Mar 11, 2005
priority date (Note) -
Expired
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Abstract
Thin film bulk acoustic wave sensors with coatings of biological and chemical materials, multiple electrode depositions and a piezo-active thin film transducer layer are hosted on a substrate. The thin film bulk acoustic wave sensor suite, or T-BASS, produces a low-voltage, IC-compliant thickness-directed electric field that is substantially uniform over a substantial portion of the active area of the BAW structure. The BAWs produced are essentially extensional plane waves propagating away from the substrate surface and having phase progression substantially oblique to the substrate surface. For BAW applications requiring sensing by an active layer, it would be most desirable to have an electrode structure that is both IC-compliant and can be energized from a low-voltage source of electrical energy. The thin film BAW sensors are compatible with IC fabrication and processing techniques, such as photolithography. Both single channel and multiple channel thin film bulk acoustic wave sensors are provided.
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