Affiliation: | a Key Laboratory of Modern Acoustics, Ministry of Education, and Institute of Acoustics, Department of Physics, Nanjing University, Nanjing 210093, China;b Key Laboratory of Noise and Vibration Research, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China;c Imaging Technology Group, Beckman Institute, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA |