Broadband Stack-layer 3 MHz – 11 MHz Dual-frequency Ultrasound Transducers for Photoacoustic Imaging

Cai, Yiqi; Luo, Xiaofei; Xu, Lijun; Chen, Zeyu; Ma, Jianguo

doi:10.1109/ius54386.2022.9958818

Cited by 3 publications

(1 citation statement)

References 7 publications

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“…However, if both layers in this vertically stacked structure are fabricated from high-property piezoelectric materials (such as Pb(Zr, Ti)O 3 (PZT) and Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 (PMN-PT)), there are signi cant coupling issues between the two layers that can generate aliasing echoes, which shift the resonant frequencies of both layers. To prevent this phenomenon, a frequency-selective anti-matching layer must be placed between the top and bottom layers to provide isolation [9][10][11] . Moreover, acoustic matching for both the low and high frequencies is di cult to optimize 12 , and fabrication becomes more di cult as the transducer dimensions are scaled down.…”

Section: Introductionmentioning

confidence: 99%

Dual-frequency piezoelectric micromachined ultrasound transducer based on polarization switching in ferroelectric thin film

Lee

Park

Jung

et al. 2023

Preprint

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Dual-frequency ultrasound has advantages over conventional ultrasound, which operates at a specific frequency band, due to its additional frequency response. Moreover, a tunable frequency from a single transducer enables sonographers to achieve ultrasound images with a large detection area and high resolution. This facilitates the availability of more advanced techniques that require low- and high frequency ultrasound simultaneously such as harmonic imaging and image-guided therapy. In this article, we present a novel method for dual-frequency ultrasound generation from a ferroelectric piezoelectric micromachined ultrasound transducer (PMUT). Uniformly designed transducer arrays can be used for both deep low-resolution imaging and shallow high-resolution imaging. To switch the ultrasound frequency, the only requirement is to tune a DC bias for controlling the polarization state of the ferroelectric film. Flextensional vibration of the PMUT’s membrane strongly depends on the polarization state, producing low- and high-frequency ultrasound from a single excitation frequency. This strategy for dual-frequency ultrasound dispenses with the requirement for either multi-electrode configurations or hetero-designed elements, which are integrated into an array. Consequently, this technique significantly reduces the design complexity of transducer arrays and their associated driving circuits.

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Section: Introductionmentioning

confidence: 99%

Dual-frequency piezoelectric micromachined ultrasound transducer based on polarization switching in ferroelectric thin film

Lee

Park

Jung

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

Dual-frequency piezoelectric micromachined ultrasound transducer based on polarization switching in ferroelectric thin films

Park,

Jung,

Kim

et al. 2023

Microsyst Nanoeng

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Due to its additional frequency response, dual-frequency ultrasound has advantages over conventional ultrasound, which operates at a specific frequency band. Moreover, a tunable frequency from a single transducer enables sonographers to achieve ultrasound images with a large detection area and high resolution. This facilitates the availability of more advanced techniques that simultaneously require low- and high-frequency ultrasounds, such as harmonic imaging and image-guided therapy. In this study, we present a novel method for dual-frequency ultrasound generation from a ferroelectric piezoelectric micromachined ultrasound transducer (PMUT). Uniformly designed transducer arrays can be used for both deep low-resolution imaging and shallow high-resolution imaging. To switch the ultrasound frequency, the only requirement is to tune a DC bias to control the polarization state of the ferroelectric film. Flextensional vibration of the PMUT membrane strongly depends on the polarization state, producing low- and high-frequency ultrasounds from a single excitation frequency. This strategy for dual-frequency ultrasounds meets the requirement for either multielectrode configurations or heterodesigned elements, which are integrated into an array. Consequently, this technique significantly reduces the design complexity of transducer arrays and their associated driving circuits.

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A multi-bandwidth photoacoustic tomography imaging system suitable for small animals

Qin,

Lei,

et al. 2024

2024 IEEE Ultrasonics, Ferroelectrics, and Frequency Control Joint Symposium (UFFC-JS)

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Broadband Stack-layer 3 MHz – 11 MHz Dual-frequency Ultrasound Transducers for Photoacoustic Imaging

Cited by 3 publications

References 7 publications

Dual-frequency piezoelectric micromachined ultrasound transducer based on polarization switching in ferroelectric thin film

Dual-frequency piezoelectric micromachined ultrasound transducer based on polarization switching in ferroelectric thin film

Dual-frequency piezoelectric micromachined ultrasound transducer based on polarization switching in ferroelectric thin films

A multi-bandwidth photoacoustic tomography imaging system suitable for small animals

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