Acoustic and Electromagnetic Double Negativity by Coiling up Space

Abstract

[evdate 2012-10-03] Institute for Advanced Study Distinguished Lecture. Title from event program: Croucher Advanced Study Institute on New Materials and New Concepts for Controlling Light and Waves. Talk no.3.

Abstract: Acoustic metamaterials are analog to their electromagnetic counterpart. They often employ local resonating elements given by subwavelength resonators. Inspired by the cut-off free waveguiding modes in acoustics, here we experimentally demonstrate an alternative route in achieving acoustic double negativity in the effective medium regime by coiling up space using curled perforations in a solid. These curled perforations delay the phase propagation to mimick one-dimensional elements with large refractive indices. By joining these high-index elements in different directions, a metamaterial with double negative density and bulk modulus can be fabricated. Moreover, we demonstrate a microwave metamaterial with double negative permittivity and permeability can be designed and fabricated using the similar principle.

Duration: 26 min.