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  4. Self-assembly of liquid crystals in nanoporous solids for adaptive photonic metamaterials
 
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Self-assembly of liquid crystals in nanoporous solids for adaptive photonic metamaterials

Citation Link: https://doi.org/10.15480/882.2517
Publikationstyp
Journal Article
Date Issued
2019
Sprache
English
Author(s)
Sentker, Kathrin  
Yildirim, Arda  
Lippmann, Milena  
Zantop, Arne  
Bertram, Florian  
Hofmann, Tommy  orcid-logo
Seeck, Oliver H.  
Kityk, Andriy V.  
Mazza, Marco G.  
Schönhals, Andreas  
Huber, Patrick  orcid-logo
Institut
Werkstoffphysik und -technologie M-22  
TORE-DOI
10.15480/882.2517
TORE-URI
http://hdl.handle.net/11420/3861
Journal
Nanoscale  
Volume
11
Citation
Nanoscale (11) (2019)
Publisher DOI
10.1039/C9NR07143A
Scopus ID
2-s2.0-85076449620
Publisher
RSC Publ.
Nanoporous media exhibit structures significantly smaller than the wavelengths of visible light and can thus act as photonic metamaterials. Their optical functionality is not determined by the properties of the base materials, but rather by tailored, multiscale structures, in terms of precise pore shape, geometry, and orientation. Embedding liquid crystals in pore space provides additional opportunities to control light-matter interactions at the single-pore, meta-atomic scale. Here, we present temperature-dependent 3D reciprocal space mapping using synchrotron-based X-ray diffraction in combination with high-resolution birefringence experiments on disk-like mesogens (HAT6) imbibed in self-ordered arrays of parallel cylindrical pores 17 to 160nm across in monolithic anodic aluminium oxide (AAO). In agreement with Monte Carlo computer simulations we observe a remarkably rich self-assembly behaviour, unknown from the bulk state. It encompasses transitions between the isotropic liquid state and discotic stacking in linear columns as well as circular concentric ring formation perpendicular and parallel to the pore axis. These textural transitions underpin an optical birefringence functionality, tuneable in magnitude and in sign from positive to negative via pore size, pore surface-grafting and temperature. Our study demonstrates that the advent of large-scale, self-organised nanoporosity in monolithic solids along with confinement-controllable phase behaviour of liquid-crystalline matter at the single-pore scale provides a reliable and accessible tool to design materials with adjustable optical anisotropy, and thus offers versatile pathways to fine-tune polarisation-dependent light propagation speeds in materials. Such a tailorability is at the core of the emerging field of transformative optics, allowing, e.g.,
adjustable light absorbers and extremely thin metalenses.
DDC Class
540: Chemie
Funding(s)
Diskotische Flüssigkristalle in Nanoporösen Festkörpern: Von der Struktur und Dynamik zum lokalen Ladungtransport  
SFB 986: Teilprojekt B7 - Polymere in grenzflächenbestimmten Geometrien: Struktur, Dynamik und Funktion an planaren und in porösen Hybridsystemen  
More Funding Information
Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)
Lizenz
https://creativecommons.org/licenses/by-nc/3.0/
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