Optical Calibration of Holographic Acoustic Tweezers.
IEEE Trans. Instrum. Meas.(2023)
摘要
Recently, acoustic tweezers based on an array of ultrasonic transducers have
been reported taking inspiration from holographic optical tweezers. In the
latter technique, the calibration of the optical trap is an essential procedure
to obtain the trap stiffnesses. On the contrary, in the case of acoustic
tweezers the calibration of the acoustic forces is seldom carried out. To cover
this gap, in this work, we adapt the calibration protocols employed in optical
tweezers to acoustic tweezers based on arrays of ultrasonic transducers. We
measure trap stiffnesses in the mN/m range that are consistent with theoretical
estimates obtained by calculations of the acoustic radiation forces based on
the Gorkov potential. This work gives a common framework to the optical and
acoustic manipulation communities, paving the way to a consistent calibration
of hybrid acoustooptical setups.
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