Versatile and scalable fabrication method for laser-generated focused ultrasound transducers
Versatile and scalable fabrication method for laser-generated focused ultrasound transducers
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DOI：
10.1364/ol.44.006005
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发表时间：
2019-12-15
期刊：
影响因子：
3.6
通讯作者：
Desjardins, A. E.
中科院分区：
文献类型：
--
作者：
Aytac-Kipergil, E.;Alles, E. J.;Desjardins, A. E.
提出了一种激光聚焦超声换能器的通用和可扩展的制造方法。该方法基于将涂覆的阴模冲压到聚二甲基硅氧烷上，并且其可以适于包括直接转移或原位合成的不同光学吸收体。传感器的直径范围内的大小下降到3毫米，纳入两个碳质（多壁碳纳米粒子和蜡烛烟灰纳米粒子）和一个等离子体（金纳米粒子）的光学吸收组件。所制造的换能器在10 MHz附近的中心频率下工作，带宽在15-20 MHz的范围内。发现直径为5 mm的换能器在具有横向宽度为150 μ m的紧密焦斑的聚焦区中产生大于35 MPa的正峰值压力。在水中演示了直径小至3 mm的换能器的光纤尖端上的超声空化。由光学学会根据知识共享署名4.0许可证的条款发布。
A versatile and scalable fabrication method for laser-generated focused ultrasound transducers is proposed. The method is based on stamping a coated negative mold onto polydimethylsiloxane, and it can be adapted to include different optical absorbers that are directly transferred or synthesized in situ. Transducers with a range of sizes down to 3 mm in diameter are presented, incorporating two carbonaceous (multiwalled carbon nanoparticles and candle soot nanoparticles) and one plasmonic (gold nanoparticles) optically absorbing component. The fabricated transducers operate at central frequencies in the vicinity of 10 MHz with bandwidths in the range of 15-20 MHz. A transducer with a diameter of 5 mm was found to generate a positive peak pressure greater than 35 MPa in the focal zone with a tight focal spot of 150 pm in lateral width. Ultrasound cavitation on the tip of an optical fiber was demonstrated in water for a transducer with a diameter as small as 3 mm. Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License.