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Proceedings Paper

Acoustical activity by chiral phonons in 3D metamaterials (Conference Presentation)
Author(s): Martin Wegener

Paper Abstract

Based on our previous static results (cf. Science 358, 1072 (2017)), we have performed experiments on acoustical activity, the mechanical counterpart of optical activity, on 3D chiral micropolar metamaterial beams at ultrasound frequencies (10-200 kHz). We find rotation angles of the incident linear polarization as large as 22 degrees per unit cell. The experiments versus frequency and beam cross section are in excellent agreement with band structure calculations and finite-element calculations for finite-size beams (cf. Nature Commun. 10, 3384 (2019)). Furthermore, we present other metamaterial architectures that approach the fundamental limit of 90 degrees polarization rotation per unit cell (unpublished).

Paper Details

Date Published: 10 March 2020
Proc. SPIE 11289, Photonic and Phononic Properties of Engineered Nanostructures X, 1128918 (10 March 2020); doi: 10.1117/12.2553915
Show Author Affiliations
Martin Wegener, Institut für Angewandte Physik, Karlsruher Institut für Technologie (Germany)

Published in SPIE Proceedings Vol. 11289:
Photonic and Phononic Properties of Engineered Nanostructures X
Ali Adibi; Shawn-Yu Lin; Axel Scherer, Editor(s)

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