题 目：Helical-Structured Acoustic Metamaterial
How to slow down sound wave propagation is an interesting topic that not only matters about fundamental explorations of slow wave physics, but also will benefit a lot of applications. A successful solution will pave the way towards freewheeling sound manipulation. In this talk, I will introduce a new acoustic metamaterial that can actually slow down acoustic wave propagation through refractive index tuning and wave-front revolution. Through simulation results and experimental output, I will present the exciting performance of such metamaterials and the fascinating things that they can do. Although the effect of decay acoustic signal the sound wave phase modulation is obvious, the helical structured acoustic metamaterial only provides satisfying transmission performance over narrow frequency range. In this presentation, I will also introduce an improved design developed based on the original helical structured acoustic metamaterial. Such improved design can slow down acoustic wave propagation through refractive index tuning and wave-front revolution, over a much wider spectrum.
Dr. Jie Zhu is an Assistant Professor in the Department of Mechanical Engineering, Hong Kong Polytechnic University. His research interest is in the area of acoustic metamaterials and metasurface. Before joining the Hong Kong Polytechnic University in July 2014, he was a post-doc scholar and associate specialist with the department of mechanical engineering at University of California Berkeley, United States. In 2008, Dr. Zhu received his PhD degree in materials engineering from the intercollege program of materials at the Pennsylvania State University, United States. He earned the B.A degree in computer science and the M.S. degree in electrical engineering, both from Nanjing University, China.
Dr. Zhu has authored tens of articles in peer-reviewed scientific journals. He is a regular reviewer for over 20 scientific and engineering journals.