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Fused-Silica 3D Chiral Metamaterials via Helium-Assisted Microcasting Supporting Topologically Protected Twist Edge Resonances with High Mechanical Quality Factors

Köpfler, Julian 1,2; Frenzel, Tobias 1; Schmalian, Jörg 3,4; Wegener, Martin 1,2
1 Institut für Angewandte Physik (APH), Karlsruher Institut für Technologie (KIT)
2 Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT)
3 Institut für Theorie der Kondensierten Materie (TKM), Karlsruher Institut für Technologie (KIT)
4 Institut für Quantenmaterialien und -technologien (IQMT), Karlsruher Institut für Technologie (KIT)


It is predicted theoretically that a 1D diatomic chain of 3D chiral cells can support a topological bandgap that allows for translating a small time-harmonic axial movement at one end of the chain into a resonantly enhanced large rotation of an edge state at the other end. This edge state is topologically protected such that an arbitrary mass of a mirror at the other end does not shift the eigenfrequency out of the bandgap. Herein, this complex 3D laser-beam-scanner microstructure is realized in fused-silica form. A novel microcasting approach is introduced that starts from a hollow polymer cast made by standard 3D laser nanoprinting. The cast is evacuated and filled with helium, such that a highly viscous commercial glass slurry is sucked in. After UV curing and thermal debinding of the polymer, the fused-silica glass is sintered at 1225 °C under vacuum. Detailed optical measurements reveal a mechanical quality factor of the twist-edge resonance of 2850 at around 278 kHz resonance frequency under ambient conditions. The microcasting approach can likely be translated to many other glasses, to metals and ceramics, and to complex architectures that are not or not yet amenable to direct 3D laser printing.

Verlagsausgabe §
DOI: 10.5445/IR/1000137056
Veröffentlicht am 07.09.2021
DOI: 10.1002/adma.202103205
Zitationen: 3
Web of Science
Zitationen: 3
Zitationen: 3
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Physik (APH)
Institut für Nanotechnologie (INT)
Institut für Quantenmaterialien und -technologien (IQMT)
Institut für Theorie der Kondensierten Materie (TKM)
Universität Karlsruhe (TH) – Interfakultative Einrichtungen (Interfakultative Einrichtungen)
Karlsruhe School of Optics & Photonics (KSOP)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 07.10.2021
Sprache Englisch
Identifikator ISSN: 0935-9648, 1521-4095
KITopen-ID: 1000137056
HGF-Programm 43.32.02 (POF IV, LK 01) Designed Optical Materials
Weitere HGF-Programme 47.11.02 (POF IV, LK 01) Emergent Quantum Phenomena
Erschienen in Advanced Materials
Verlag John Wiley and Sons
Band 33
Heft 40
Seiten Art. Nr.: 2103205
Vorab online veröffentlicht am 16.08.2021
Nachgewiesen in Dimensions
Web of Science
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