Title: Tailoring Bound States in the Continuum by Circular Clusters of Scatterers
Time: 14:00 to 17:00, Thursday, August.3, 2023
Place: F210, School of Mechanical Engineering
Speaker: Assoc.Prof.Daniel Torrent Martí (Universitat Jaume I)
Host: QU Yegao, Professor, GAO Penglin, Assoc. Professor (Institute of Vibration, Shock & Noise)

Biography
Daniel Torrent Martí received his Ph.D. from the Polytechnic University of Valencia, Spain in 2008, and is currently a professor at the Universitat Jaume I in Spain, where he has presided over a number of major projects including the European Innovation Council Pathfinder Project. He is currently the associate editor of Wave motion and advisory panel member in JPD. He has developed theoretical concepts, numerical tools and performed experimental demonstrations, which could be divided in some points: Quasi-static Homogenization of composites as frequency-independent effective composites, Dynamic Homogenization of the effective material systems in its constitutive parameters; new theoretical concepts of topological materials or time dependent media in the fields of acoustics, elasticity and electromagnetism; several acoustic and elastic devices devoted to the control, focusing and absorption of waves, being the most relevant of these devices acoustic cloaking shells, gradient index devices, omnidirectional absorbers and circular lenses.

Abstract
The realization of high-quality resonators is a challenging problem in all domains of physics devoted to the control and harness of classical waves, like photonics and acoustics. Bound states in the continuum (BICs) offer a route for the realization of a special class of resonant cavities, structures based on them can be used for the design of excellent resonators presenting extraordinarily high-quality factors. The efficient design of these cavities is of paramount importance in either photonics and acoustics. This report will focus on the problem of acoustic waves in two different structures, i.e., the propagation of flexural waves in thin elastic plates and acoustic waves trapped atop a structured metasurface. Numerical simulations and experimental realizations show that this work opens a path towards the design of easy-to-tailor acoustic cavities.