Woodruff School of Mechanical Engineering

Seminar

Title:

Acoustic Metasurfaces

Speaker:

Prof. Yun Jing

Affiliation:

North Carolina State University

When:

Tuesday, October 16, 2018 at 11:00:00 AM

Where:

GTMI Building, Room Auditorium

Host:

Dr. Chengzhi Shi
chengzhi.shi@gatech.edu
404-894-2558

Abstract

Wave manipulation using artificial materials is a central topic in materials physics. Recent years have witnessed the emergence of a family of thin, 2D artificial materials, namely, metasurfaces. The concept of metasurfaces was introduced to the materials and physics communities for optical waves in 2011 with the generalized Snell’s law, which opened up a new degree of freedom for optical wave manipulation. Inspired by this pioneering work, and because acoustic waves also follow the Snell’s law, a flurry of activity has revealed acoustic metasurfaces for controlling sound and new applications in acoustics. However, mapping the success of electromagnetic metasurfaces to the acoustic domain is challenging, primarily owing to the intrinsic differences between electromagnetic and acoustic waves. In this talk, I will delineate the underlying fundamental physics of metasurfaces, describe their different concepts, the design strategy, and discuss their functionalities for controllable reflection, transmission, and extraordinary absorption. In particular, I will discuss our recent works on acoustic metasurfaces for sound diffuse reflection, asymmetrical transmission, acoustic hologram, and noise control.


Biography

Yun Jing received a B.S. degree in electronic science and engineering from Nanjing University, China, in 2006 and an M.S. degree from Rensselaer Polytechnic Institute in 2007. He received his Ph.D. degree in architectural acoustics from Rensselaer Polytechnic Institute in 2009. Prior to joining the North Carolina State University in 2011, he was a research fellow at Brigham and Women's Hospital, Harvard Medical School. He was promoted to tenured Associate Professor in 2017. He specializes in the development of analytic and numerical methods for linear and nonlinear wave propagation in fluids. He is interested in biomedical ultrasound, acoustic metamaterials, architectural acoustics, nonlinear acoustics and noise control. He has published over 50 peer-reviewed scientific manuscripts. He is a senior member of IEEE and an elected member of technical committee of IEEE Ultrasonics (TPC 3). He is an associate editor of the Journal of the Acoustical Society of America. He is the recipient of the 2018 R. Bruce Lindsay Award from the Acoustical Society of America.

Notes

Refreshments will be served.