IEEE Trans Ultrason Ferroelectr Freq Control. 2020 Nov;67(11):2471-2474. doi: 10.1109/TUFFC.2020.3014352. Epub 2020 Aug 5.
The development of ultrasonic tweezers with multiple manipulation functions is challenging. In this work, multiple advanced manipulation functions are implemented for a single-probe-type ultrasonic tweezer with the double-parabolic-reflector wave-guided high-power ultrasonic transducer (DPLUS). Due to strong high-frequency (1.49 MHz) linear vibration at the manipulation probe's tip, which is excited by the DPLUS, the ultrasonic tweezer can capture microobjects in a noncontact mode and transport them freely above the substrate. The captured microobjects that adhere to the probe's tip in the low-frequency (154.4 kHz) working mode can be released by tuning the working frequency. The results of the finite-element method analyses indicate that the manipulations are caused by the acoustic radiation force.
多操控功能超声镊子的研发极具挑战性。在这项工作中，采用双曲反射波导高功率超声换能器（DPLUS），对单探头式超声镊子实现了多种先进的操控功能。由于 DPLUS 激励下操控探头尖端产生强高频（1.49MHz）线性振动，超声镊子可实现微物体非接触式捕获，并在基底上方自由运输。在低频（154.4kHz）工作模式下，通过调节工作频率可释放附着在探头尖端的捕获微物体。有限元方法分析结果表明，操控是由声辐射力引起的。
