Enhanced and reduced transmission of acoustic waves with bubble   meta-screens
  We present a class of sonic meta-screens for manipulating air-borne acoustic waves at ultrasonic or audible frequencies. Our screens consist of periodic arrangements of air bubbles in water or possibly embedded in a soft elastic matrix. They can be used for soundproofing, but also for exalting transmission at an air/water interface or even to achieve enhanced absorption. 
Alice Bretagne, Arnaud Tourin, V. Leroy (MSC)
physics.class-ph