Journal ArticleDOI
Tapered gold-helix metamaterials as improved circular polarizers
Justyna K. Gansel,Michael Latzel,Andreas Frölich,Johannes Kaschke,Michael Thiel,Martin Wegener +5 more
TLDR
In this paper, the authors show that the bandwidth of a 3D gold helices can be increased to 1.5 octaves by tapering the gold-helix radius.Abstract:
We have previously shown that square arrays of three-dimensional gold helices can serve as compact broadband circular polarizers. Here, we show by heuristic reasoning supported by numerical calculations that the bandwidth of the device can realistically be increased to 1.5 octaves by tapering the gold-helix radius. The tapering also improves the extinction ratio. Depending on the side from which light impinges onto the tapered helices, the polarization conversions are different. Therefore, the structure is either optimal as polarizer or as analyzer. Corresponding structures for the infrared spectral range are fabricated by direct laser writing and gold electroplating.read more
Citations
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Metal oxide semiconductor thin-film transistors for flexible electronics
Luisa Petti,Niko Munzenrieder,Niko Munzenrieder,Christian Vogt,Hendrik Faber,Lars Büthe,Giuseppe Cantarella,Francesca Bottacchi,Thomas D. Anthopoulos,Gerhard Tröster +9 more
TL;DR: Flexible metal oxide semiconductor thin-film transistors (TFTs) are considered the most promising technology for tomorrow's electronics as discussed by the authors and are therefore considered to be a promising technology in the field of flexible electronics.
Journal ArticleDOI
Ultrafast laser nanostructuring of photopolymers: a decade of advances
TL;DR: In this paper, the basic principles and the most important developments and applications of ultrashort laser pulses are reviewed, together with current and potential future applications in diverse fields such as metamaterials, plasmonics, micro-optics and biomedical devices and implants.
Journal ArticleDOI
Optical chiral metamaterials: a review of the fundamentals, fabrication methods and applications.
TL;DR: The fundamental principles of chiral metamaterials are discussed, various optical chiral materials realized by different nanofabrication approaches, and the applications and future prospects of this emerging field are discussed.
Journal ArticleDOI
Chirality and Chiroptical Effects in Metal Nanostructures: Fundamentals and Current Trends
Joel T. Collins,Christian Kuppe,David C. Hooper,Concita Sibilia,Marco Centini,Ventsislav K. Valev +5 more
TL;DR: In this paper, the emergence and evolution of chirality in molecules, as a function of geometrical parameters, is discussed and a survey of modern chiral materials is presented.
Journal ArticleDOI
Nanoscale 3D Chiral Plasmonic Helices with Circular Dichroism at Visible Frequencies
Marco Esposito,Vittorianna Tasco,Massimo Cuscunà,Francesco Todisco,Alessio Benedetti,Iolena Tarantini,Milena De Giorgi,Daniele Sanvitto,A. Passaseo +8 more
TL;DR: In this paper, the authors demonstrate tailored chiro-optical effects in plasmonic nanohelices, by a fabrication process providing a nanometer scale control on geometrical features, that leads to a fine tuning of operation band even in the visible range.
References
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Journal ArticleDOI
Gold Helix Photonic Metamaterial as Broadband Circular Polarizer
Justyna K. Gansel,Michael Thiel,Michael S. Rill,Manuel Decker,Klaus Bade,Volker Saile,Georg von Freymann,Stefan Linden,Martin Wegener +8 more
TL;DR: This work investigated propagation of light through a uniaxial photonic metamaterial composed of three-dimensional gold helices arranged on a two-dimensional square lattice that is scalable to other frequency ranges and can be used as a compact broadband circular polarizer.
Journal ArticleDOI
Magnetic Response of Metamaterials at 100 Terahertz
Stefan Linden,C. Enkrich,Martin Wegener,Jiangfeng Zhou,Thomas Koschny,Thomas Koschny,Costas M. Soukoulis,Costas M. Soukoulis +7 more
TL;DR: The measured optical spectra of the nanofabricated gold structures come very close to the theoretical expectations and additional numerical simulations show that the structures exhibit a frequency range with negative permeability for a beam configuration in which the magnetic field couples to the LC resonance.
Journal ArticleDOI
Nanostructured metal film with asymmetric optical transmission.
Alexander S. Schwanecke,Vassili A. Fedotov,Vyacheslav V. Khardikov,Sergey L. Prosvirnin,Y Chen,Nikolay I. Zheludev +5 more
TL;DR: It is demonstrated for the first time a nanostructured planar photonic metamaterial transmitting light differently in forward and backward directions.
Journal ArticleDOI
Gold helix photonic metamaterials: A numerical parameter study
TL;DR: This study systematically study the dependence of the metamaterial's chiral optical properties on helix pitch, helix radius, two-dimensional lattice constant, wire radius, number of helix pitches, and angle of incidence.