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We report on practical realization of novel liquid sensor upon a base of typical SAW device design. The sensor is implemented as a periodic microfluidic structure atop a piezoelectric substrate. Simultaneous employment of phononic crystal phenomenon and structural resonance inside the phononic crystal is the basic idea behind. The phononic crystal band gap prevents propagation of traveling waves through...
Sensing is nowadays an accepted application of phononic crystals with chemical and biosensors for liquid analytes being the perhaps most promising ones. A liquid-filled defect is introduced that turns into a resonant cavity. Similar to the well-known resonant sensors sensitivity can be increased with higher operating frequencies. We introduce a Sandwiched Phononic Crystal (SPC), which applies a resonant...
Phononic crystal sensors are promising for liquid sensor applications. We have already shown that the frequency of narrow transmission bands depends on properties of liquids confined within a 2D phononic crystal. In comparison to almost all liquid sensor platforms where sensors respond to effects close to the sensor surface, e.g. mass load due to absorption of molecules in a recognition layer, the...
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