Acoustic Levitation

Acoustic levitation, also known as acoustic tweezer, is a technique using acoustic radiation force to counteract the gravity of small objects in the mid air to make them suspended in the mid air. 

The first acoustic levitator I built is called TinyLev configuration, which is composed of two oppositing curved transdcer array. The inventor has posted the step-by-step instructions on how to build this acoustic levitator here. 

For PhD research project, I study the static, dynamic, heat and mass transfer of acoustically levitated liquid droplets.