Ultrasound #3: Get an idea of ultrasonic levitation.

This is a great video of Dr. Asier Marzo to grasp overview of ultrasonic levitation.

He also shares an idea of how to make DIY ultrasonic phased array. Check Ultrasonic Array. My short term goal is to follow his steps and make 8 by 8 ultrasonic phased array. Eventually, I want to design a board by myself and create bigger and more complex ultrasonic phased array, like 16 by 16.