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Título: | Ferroelectric chiral nematic liquid crystals: new photonic materials with multiple bandgaps controllable by low electric fields |
Autor: | Ortega, Josu; Folcia, César L.; Etxebarria, Jesus; Sierra, Teresa CSIC ORCID | Fecha de publicación: | 2022 | Editor: | Taylor & Francis | Citación: | Liquid Crystals 49(15): 2128-2136 (2022) | Resumen: | We have carried out a spectroscopic study on a prototype ferroelectric nematic material (RM734) doped with a non-polar chiral compound. The mixture presents two chiral nematic phases, one conventional (N*) and the other polar (NF*), whose behaviours under electric fields E are totally different. On the one hand, the N* phase shows a single reflection band if E is not very high, while fields perpendicular to the helix of a few V/mm are already sufficient to produce multiple bands in the NF* phase. On the other hand, the pitch of the NF* phase grows notably on increasing fields, however remaining practically constant in the N* phase. Both effects have been explained in terms of the different type of interaction with E in each phase (ferroelectric in NF* and dielectric in N*). We argue that the NF* phase behaves as a photonic material with multiple gaps tunable by small fields, which presents important potentials for applications. A study of the bandgaps has been carried out through the analysis of the dispersion relation of the optical eigenmodes in the NF* phase under field. Finally, an example of the potentials of the NF* phase within the field of nonlinear optics is briefly presented. | Versión del editor: | https://doi.org/10.1080/02678292.2022.2104949 | URI: | http://hdl.handle.net/10261/303883 | DOI: | 10.1080/02678292.2022.2104949 | E-ISSN: | 1366-5855 |
Aparece en las colecciones: | (INMA) Artículos |
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