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Fernandez-Corbaton I, Rockstuhl C, Ziemke P, Gumbsch P, Albiez A, Schwaiger R, Frenzel T, Kadic M, Wegener M. New Twists of 3D Chiral Metamaterials. Adv Mater 2019; 31:e1807742. [PMID: 30790363 DOI: 10.1002/adma.201807742] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Indexed: 06/09/2023]
Abstract
Rationally designed artificial materials, called metamaterials, allow for tailoring effective material properties beyond ("meta") the properties of their bulk ingredient materials. This statement is especially true for chiral metamaterials, as unlocking certain degrees of freedom necessarily requires broken centrosymmetry. While the field of chiral electromagnetic/optical metamaterials has become rather mature, the field of elastic/mechanical metamaterials is just emerging and wide open. This research news reviews recent theoretical and experimental progress concerning 3D chiral mechanical and optical metamaterials, with special emphasis on work performed at KIT.
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Affiliation(s)
- I Fernandez-Corbaton
- Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), 76128, Karlsruhe, Germany
| | - C Rockstuhl
- Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), 76128, Karlsruhe, Germany
- Institute of Theoretical Solid State Physics, Karlsruhe Institute of Technology (KIT), 76128, Karlsruhe, Germany
| | - P Ziemke
- Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), 76128, Karlsruhe, Germany
| | - P Gumbsch
- Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), 76128, Karlsruhe, Germany
- Institute for Applied Materials, Karlsruhe Institute of Technology (KIT), 76128, Karlsruhe, Germany
- Fraunhofer IWM, Wöhlerstr. 11, 79108, Freiburg, Germany
| | - A Albiez
- Institute for Applied Materials, Karlsruhe Institute of Technology (KIT), 76128, Karlsruhe, Germany
| | - R Schwaiger
- Institute for Applied Materials, Karlsruhe Institute of Technology (KIT), 76128, Karlsruhe, Germany
| | - T Frenzel
- Institute of Applied Physics, Karlsruhe Institute of Technology (KIT), 76128, Karlsruhe, Germany
| | - M Kadic
- Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), 76128, Karlsruhe, Germany
- Institut FEMTO-ST, UMR 6174, CNRS, Université de Bourgogne Franche-Comté, 25000, Besançon, France
| | - M Wegener
- Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), 76128, Karlsruhe, Germany
- Institute of Applied Physics, Karlsruhe Institute of Technology (KIT), 76128, Karlsruhe, Germany
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Garcia-Santiago X, Burger S, Rockstuhl C, Fernandez-Corbaton I. Measuring the electromagnetic chirality of 2D arrays under normal illumination. Opt Lett 2017; 42:4075-4078. [PMID: 29028016 DOI: 10.1364/ol.42.004075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2017] [Accepted: 09/05/2017] [Indexed: 06/07/2023]
Abstract
We present an electromagnetic chirality measure for 2D arrays of subwavelength periodicities under normal illumination. The calculation of the measure uses only the complex reflection and transmission coefficients from the array. The measure allows the ordering of arrays according to their electromagnetic chirality, which further allows a quantitative comparison of different design strategies. The measure is upper bounded, and the extreme properties of objects with high values of electromagnetic chirality make them useful in both near- and far-field applications. We analyze the consequences that different possible symmetries of the array have on its electromagnetic chirality. We use the measure to study four different arrays. The results indicate the suitability of helices for building arrays of high electromagnetic chirality, and the low effectiveness of a substrate for breaking the transverse mirror symmetry.
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Abstract
We unveil the relationship between two anomalous scattering processes known as Kerker conditions and the duality symmetry of Maxwell equations. We generalize these conditions and show that they can be applied to any particle with cylindrical symmetry, not only to spherical particles as the original Kerker conditions were derived for. We also explain the role of the optical helicity in these scattering processes. Our results find applications in the field of metamaterials, where new materials with directional scattering are being explored.
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Affiliation(s)
- X Zambrana-Puyalto
- Department of Physics and Astronomy, Macquarie University, NSW 2109, Australia.
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