His contributions is so outstanding that it was published in Nature Communication journal ranking 3 in a list of 63, with an impact factor of 12.3.
The following video explains the working of acoustic levitation by combining computer simulation images with the real levitator:
As his PhD supervisor I had the pleasure to help him learn what research is and how to conduct it. Luckyly I was also able to learn things as he develop his work.
After his PhD Defense Asier has continued working on acoustic levitation in Bristol University as a Post Doc doing amazing things as this portable acoustic tractor beam: