Janus Piezoelectric Composite Design for High-Performance Ultrasonic Transducers and Imaging Applications

Area of Science:

• Materials Science
• Acoustics Engineering
• Biomedical Imaging

Background:

• Traditional ultrasonic transducers often face limitations in bidirectional acoustic radiation and impedance matching.
• Heterogeneous piezoelectric composites offer potential for enhanced transducer performance.
• Optimizing electroacoustic energy conversion is crucial for advanced imaging techniques.

Purpose of the Study:

• To propose and characterize a Janus ultrasonic transducer with double-sided 1-3 piezoelectric composites.
• To investigate the transducer's bidirectional acoustic radiation and impedance matching capabilities.
• To evaluate the transducer's performance in photoacoustic imaging.

Main Methods:

• Design of a heterogeneous ultrasonic transducer inspired by the Janus concept.
• Utilizing double-sided 1-3 piezoelectric composites with a "dense-monolithic-sparse" distribution.
• Finite element simulations to analyze vibration modes and performance metrics.
• Fabrication and testing of the Janus transducer for imaging applications.

Main Results:

• The Janus transducer demonstrated bidirectional acoustic radiation and optimized impedance matching.
• Superior vibration mode performance and enhanced electroacoustic energy conversion efficiency were confirmed.
• A high electromechanical coupling coefficient, wide bandwidth, and improved echo voltage amplitude (∼3.35 V) were achieved.
• High-quality photoacoustic imaging was successfully demonstrated using the fabricated transducers.

Conclusions:

• The proposed Janus transducer design effectively enhances ultrasonic transducer performance.
• The heterogeneous composite approach provides a viable method for high-performance transducers.
• The Janus transducer shows significant promise for applications in underwater ultrasonic imaging and photoacoustic imaging.