Mathias Fink
Langevin Institute
ESPCI Paris, PSL University,
1 rue Jussieu, 75005, Paris, France
11th July 2023, 04:00pm - 05:00pm (GST)
| Title: | Broadband Wavefront Shaping for Ultra-wideband Communications with reconfigurable intelligent surfaces: From Acoustics to Microwave |
| Abstract: | Reconfigurable intelligent surfaces (RIS) is currently a topic of great interest in the wireless communication community and it is proposed as a new paradigm for the sixth generation (6G) of communication networks. The same concept is also under development for multi-user sound communications in reverberating environment as acoustic reconfigurable intelligent surfaces (ARIS), However, when dealing with audible acoustic waves, the problem is more complex that for classical narrowband RIS, as the reconfigurable surface needs to cover a wide range of frequencies spanning several decades. Consequently, each element of the RIS needs to have a complex transient response to optimize its performance across each spectral range. To address this challenge, we have developed feedback metasurfaces where each elementary cell works as a reconfigurable spatio-temporal filter. By appropriately configuring the spatio-temporal filters of the metasurface, one can establish acoustic communication between groups of individuals immersed in a noisy environment, effectively creating a multiple-user multiple-input multiple-output (MU-MIMO) acoustic system. This research opens the field of ultrawideband RIS communications systems. |
| Bio: | Mathias Fink is the George Charpak Professor at the Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris) where he founded In 1990 the Laboratory “Ondes et Acoustique” that became in 2009 the Langevin Institute. He is member of the French Academy of Science and of the National Academy of Technologies of France. In 2008, he was elected at the College de France on the Chair of Technological Innovation. He has received several scientific awards as the CNRS Medal of innovation, the Helmholtz-Rayleigh Award of the Acoustical Society of America, the Rayleigh Award of the IEEE Ultrasonics Society and the Edwin H. Land Medal of the Optical Society of America. Mathias Fink’s area of research is concerned with the propagation of waves in complex media and the development of numerous instruments based on this basic research. His current research interests include wave control in complex media, time-reversal in physics, metamaterials, telecommunications, super- resolution, medical ultrasonic imaging, multiwave imaging. 7 start-up companies with more than 400 employees have been created from his research (Echosens, Sensitive Object, Supersonic Imagine, Time Reversal Communications, CardiaWave, Greenerwave, Austral DX). |