Our NanoNews Digest Sponsors Home > Press > Perfect transmission through barrier using sound: New study experimentally proved for the first time a century-old quantum theory that relativistic particles can pass through a barrier with 100% transmission The phononic crystals are made by artificially placing the acrylic posts in the special pattern. CREDIT The University of Hong Kong Abstract: The perfect transmission of sound through a barrier is difficult to achieve, if not impossible based on our existing knowledge. This is also true with other energy forms such as light and heat. Perfect transmission through barrier using sound: New study experimentally proved for the first time a century-old quantum theory that relativistic particles can pass through a barrier with 100% transmission