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Ultrasound experiments on acoustical activity in chiral mechanical metamaterials

Frenzel, Tobias; Köpfler, Julian; Jung, Erik; Kadic, Muamer; Wegener, Martin

Optical activity requires chirality and is a paradigm for chirality. Here, we present experiments on its mechanical counterpart, acoustical activity. The notion “activity” refers the rotation of the linear polarization axis of a transversely polarized (optical or mechanical) wave. The rotation angle is proportional to the propagation distance and does not depend on the orientation of the incident linear polarization. This kind of reciprocal polarization rotation is distinct from nonreciprocal Faraday rotation, which requires broken time-inversion symmetry. In our experiments, we spatiotemporally resolve the motion of three-dimensional chiral microstructured polymer metamaterials, with nanometer precision and under time-harmonic excitation at ultrasound frequencies in the range from 20 to 180 kHz. We demonstrate polarization rotations as large as 22° per unit cell. These experiments pave the road for molding the polarization and direction of elastic waves in three dimensions by micropolar mechanical metamaterials.

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Verlagsausgabe §
DOI: 10.5445/IR/1000097234
Veröffentlicht am 04.09.2019
DOI: 10.1038/s41467-019-11366-8
Zitationen: 25
Web of Science
Zitationen: 24
Zitationen: 25
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Physik (APH)
Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 01.12.2019
Sprache Englisch
Identifikator ISSN: 2041-1723
KITopen-ID: 1000097234
HGF-Programm 43.23.01 (POF III, LK 01) Advanced Optical Lithography+Microscopy
Erschienen in Nature Communications
Verlag Nature Research
Band 10
Seiten Art.Nr. 3384
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 29.07.2019
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