Zak and Derek discuss acoustic levitaiton with Dr. David Jackson, Professor of Physics and Astronomy at Dickinson College.

Their published paper at AAJP (requires subscription), "Acoustic levitation and the acoustic radiation force":
https://aapt.scitation.org/doi/10.1119/10.0002764

You can contact Dr. Jackson to request a copy:
https://www.dickinson.edu/site/custom_scripts/dc_faculty_profile_index.php?fac=jacksond

Ming-Hua Chang's senior thesis, "Using Schlieren Optics to Visualize Ultrasonic Standing Waves In Acoustic Levitation":
https://scholar.dickinson.edu/cgi/viewcontent.cgi?article=1391&context=student_honors

Dr. Daniel A Russell's Acoustics and Vibration Animations:
https://www.acs.psu.edu/drussell/demos.html

Selected gifs of wave motion:
https://www.acs.psu.edu/drussell/Demos/waves/wavemotion.html
https://www.acs.psu.edu/drussell/Demos/Reflect-Particles/Reflect-Particles.html
https://www.acs.psu.edu/drussell/Demos/phase-p-u-sine/phase-p-u-sine.html
https://www.acs.psu.edu/drussell/Demos/SWR/SWR.html

Physics Girl video building an acoustic levitator on Youtube:
https://www.youtube.com/watch?v=ABjRnSYw-4k

Acoustic levitation on Wikipedia:
https://en.wikipedia.org/wiki/Acoustic_levitationThe podcast lives at https://www.thehyperfine.com/
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