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Mind the Microgap in Iridescent Cellulose Nanocrystal Films
Author(s) -
Fernandes Susete N.,
Almeida Pedro L.,
Monge Nuno,
Aguirre Luis E.,
Reis Dennys,
de Oliveira Cristiano L. P.,
Neto António M. F.,
Pieranski Pawel,
Godinho Maria H.
Publication year - 2017
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201603560
Subject(s) - iridescence , materials science , nanocrystal , liquid crystal , structural coloration , photonic crystal , photonics , cellulose , electric field , planar , optoelectronics , optics , nanotechnology , perpendicular , micrometer , cholesteric liquid crystal , chemical engineering , physics , engineering , computer graphics (images) , geometry , quantum mechanics , mathematics , computer science
A new photonic structure is produced from cellulose nanocrystal iridescent films reflecting both right and left circularly polarized light. Micrometer‐scale planar gaps perpendicular to the films' cross‐section between two different left‐handed films' cholesteric domains are impregnated with a nematic liquid crystal. This photonic feature is reversibly tuned by the application of an electric field or a temperature variation.