Multi-Frequency BAW Resonator for Mixing and Liquid-Phase Sensing
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Solution Overview
Problem
Conventional biochemical sensing devices face limitations in consistent analyte distribution and low binding rates due to laminar flow in microfluidic channels, which slows down the measurement process, especially for large analyte molecules.
Innovation Solution
A bulk acoustic wave (BAW) resonator system with a piezoelectric material having a c-axis orientation predominantly non-parallel to the substrate face, featuring a top side electrode with recesses to induce rotary mixing, and a driving circuit that alternates between dominant shear and longitudinal responses to enhance analyte binding and detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If laminar flow is used in microfluidic channels, then device complexity is reduced, but analyte distribution consistency deteriorates and binding rates decrease
Solution Approach 1:
The patent applies acoustic vibration through a BAW resonator to induce mixing in the fluid. The resonator generates mechanical vibrations that create standing waves in the fluid, producing regions of high and low velocity that enhance analyte distribution and binding rates without requiring complex mechanical pumping or mixing mechanisms.
Solution Approach 2:
The patent replaces traditional mechanical mixing systems (such as magnetic stirrers or peristaltic pumps) with an acoustic field-based mixing approach. The BAW resonator uses acoustic energy to induce fluid motion and mixing, eliminating the need for complex mechanical components while improving mixing efficiency.
2Device complexity
If laminar flow is used in microfluidic channels, then device complexity is reduced, but measurement time increases
Solution Approach 1:
The acoustic vibration from the BAW resonator creates rapid mixing cycles that significantly reduce the time required for analyte distribution and binding. The vibrational energy accelerates the mixing process from minutes to seconds, thereby reducing overall measurement time while keeping the device structure simple.
Solution Approach 2:
The patent employs periodic acoustic excitation at resonant frequencies to create cyclic mixing patterns. This periodic action enhances mass transport and binding kinetics by repeatedly cycling fluid elements through high-shear regions, accelerating the measurement process without requiring complex temporal control mechanisms.
3Measurement precision
If dominant shear response is used for detection, then sensitivity is improved, but mixing capability is reduced
Solution Approach 1:
The patent dynamically switches the BAW resonator between two operational modes: dominant shear mode for sensitive detection and dominant longitudinal mode for effective mixing. This dynamic reconfiguration allows the system to optimize performance for each specific function, achieving both high sensitivity and strong mixing capability through temporal separation of functions.
Solution Approach 2:
The system uses periodic switching between shear-dominated and longitudinal-dominated acoustic modes. During detection phases, the resonator operates in shear mode for high sensitivity, while during mixing phases, it switches to longitudinal mode for enhanced mixing, creating a rhythmic alternation that achieves both objectives.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The BAW resonator system increases analyte binding rates by promoting mixing and reduces measurement time through efficient fluid mixing and detection of bound analytes, improving the sensitivity and speed of biochemical sensing.
Implementation Method 1
a piezoelectric material comprising a c-axis having an orientation distribution that is predominantly non-parallel to normal of a face of a substrate
Implementation Method 2
an acoustic wave may embody a bulk acoustic wave (BAW) propagating through the interior (or 'bulk') of a piezoelectric material
Implementation Method 3
Driving of the BAW resonator structure at a frequency configured to cause the piezoelectric material to exhibit a dominant longitudinal response tends to promote mixing of analyte in the fluid
Implementation Method 4
a selective biochemical reaction between a specific binding material (e.g., an antibody, a receptor, a ligand, etc.) and a target species
Implementation Method 5
Changes in velocity can be monitored by measuring the frequency, magnitude, and/or phase characteristics of the acoustic wave device and can be correlated to a physical quantity being measured
Data Source
AI summary
A sensing system utilizes a channel, a BAW resonator structure including piezoelectric material with a c-axis having an inclined orientation, at least one functionalization material arranged over an active region of the BAW resonator structure, and a driving circuit configured to apply AC signals at different frequencies to cause the piezoelectric material to selectively exhibit a dominant shear response or a dominant longitudinal response. Driving the piezoelectric material in longitudinal mode induces localized fluid mixing proximate to the active region, whereas driving in shear mode permits detection of analyte bound to the at least one functionalization material in a liquid environment. Recesses may be defined in a surface of a top side electrode to enhance longitudinal mode mixing.