title: Mind the Microgap in Iridescent Cellulose Nanocrystal Films.
abstract: 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.
authors.affiliation: i3N/CENIMAT, Department of Materials Science, Faculty of Science and Technology, Universidade NOVA de Lisboa, Campus de Caparica, 2829-516, Caparica, Portugal.
authors.forename: Susete N
authors.initials: SN
authors.lastname: Fernandes
authors.affiliation: i3N/CENIMAT, Department of Materials Science, Faculty of Science and Technology, Universidade NOVA de Lisboa, Campus de Caparica, 2829-516, Caparica, Portugal.|Área Departamental de Física, Instituto Superior de Engenharia de Lisboa, Instituto Politécnico de Lisboa, 1959-007, Lisbon, Portugal.
authors.forename: Pedro L
authors.initials: PL
authors.lastname: Almeida
authors.affiliation: i3N/CENIMAT, Department of Materials Science, Faculty of Science and Technology, Universidade NOVA de Lisboa, Campus de Caparica, 2829-516, Caparica, Portugal.|CIAUD, Faculty of Architecture, University of Lisbon, Rua Sá Nogueira, Pólo Universitário, Alto da Ajuda, 1349-055, Lisbon, Portugal.|CIED, Lisbon School of Education, Polytechnic Institute of Lisbon, Campus de Benfica do IPL, 1549-003, Lisbon, Portugal.
authors.forename: Nuno
authors.initials: N
authors.lastname: Monge
authors.affiliation: i3N/CENIMAT, Department of Materials Science, Faculty of Science and Technology, Universidade NOVA de Lisboa, Campus de Caparica, 2829-516, Caparica, Portugal.
authors.forename: Luis E
authors.initials: LE
authors.lastname: Aguirre
authors.affiliation: Instituto de Física, Universidade de São Paulo, Rua do Matão, 1371, 05508-090, São Paulo, SP, Brazil.
authors.forename: Dennys
authors.initials: D
authors.lastname: Reis
authors.affiliation: Instituto de Física, Universidade de São Paulo, Rua do Matão, 1371, 05508-090, São Paulo, SP, Brazil.
authors.forename: Cristiano L P
authors.initials: CL
authors.lastname: de Oliveira
authors.affiliation: Instituto de Física, Universidade de São Paulo, Rua do Matão, 1371, 05508-090, São Paulo, SP, Brazil.
authors.forename: António M F
authors.initials: AM
authors.lastname: Neto
authors.affiliation: Laboratoire de Physique des Solides, UMR 8502, Université Paris-Sud, Bât. 510, 91405, Orsay, France.
authors.forename: Pawel
authors.initials: P
authors.lastname: Pieranski
authors.affiliation: i3N/CENIMAT, Department of Materials Science, Faculty of Science and Technology, Universidade NOVA de Lisboa, Campus de Caparica, 2829-516, Caparica, Portugal.
authors.forename: Maria H
authors.initials: MH
authors.lastname: Godinho
keywords: cellulose nanocrystals; liquid crystals; mimicking Plusiotis resplendens cuticles; photonics