Low voltage ring resonators in acoustic tweezers enable manipulation of small particles with acoustic waves generating less heat

https://pratt.duke.edu/news/ring-resonators-unlock-new-abilities-in-acoustic-tweezers/?cn-reloaded=1 

"higher precision/ lower power: trapping, moving, mixing... overcomes heating from high voltage applied to transducers... acoustic waves focused on each end of 2 channels running parallel, ring between lets in specific frequency which it then resonates at, amplifying, creating standing waves in liquid above, trapping particles... adjust acoustic wave amplitude on ring by changing input frequency... advanced design: 2 or more ring resonators with different resonate frequencies... biology, medicine, materials science"

Related: Complex atoms in optical tweezers
https://www.uibk.ac.at/en/newsroom/2024/complex-atoms-in-optical-tweezers/