| Title | Bulk Acoustic Wave Based Mocrfluidic Particle Sorting with Capacitive Micromachined Ultrasonic Transducers |
| Publication Type | Conference Paper |
| Year of Publication | 2022 |
| Authors | Kawasaki, Shinnosuke, Yeh, Jia–Jun, Saccher, Marta, Li, Jian, Dekker, Ronald |
| Conference Name | 2022 IEEE 35th International Conference on Micro Electro Mechanical Systems Conference (MEMS) |
| Keywords | acoustic coupling, Acoustic particle sorting, bulk acoustic wave, CMUT, Conferences, Human Behavior, Microfluidic particle sorting, Optical variables measurement, pubcrawl, resilience, Resiliency, Scalability, Sonar equipment, Surface acoustic waves, ultrasonic imaging, ultrasonic transducers, Ultrasonic variables measurement |
| Abstract | The main limitation of acoustic particle separation for microfluidic application is its low sorting efficiency. This is due to the weak coupling of surface acoustic waves (SAWs) into the microchannel. In this work, we demonstrate bulk acoustic wave (BAW) particle sorting using capacitive micromachined ultrasonic transducers (CMUTs) for the first time. A collapsed mode CMUT was driven in air to generate acoustic pressure within the silicon substrate in the in-plane direction of the silicon die. This acoustic pressure was coupled into a water droplet, positioned at the side of the CMUT die, and measured with an optical hydrophone. By using a beam steering approach, the ultrasound generated from 32 CMUT elements were added in-phase to generate a maximum peak-to-peak pressure of 0.9 MPa. Using this pressure, 10 um latex beads were sorted almost instantaneously. |
| DOI | 10.1109/MEMS51670.2022.9699807 |
| Citation Key | kawasaki_bulk_2022 |
Bulk Acoustic Wave Based Mocrfluidic Particle Sorting with Capacitive Micromachined Ultrasonic Transducers