Titre

Asymmetric tunable Fabry-Perot cavity using switchable polymer stabilized cholesteric liquid crystal optical Bragg mirror

Auteur(s)

SATHAYE Kedar1, DUPONT Laurent1, DE BOUGRENET DE LA TOCNAYE Jean-Louis1

Type de document

Article de revue avec comité de lecture

Source

Optical engineering, mars 2012, vol. 51, n° 3, pp. 034001-1-034001-7

Année

2012

Résumé

In optical telecommunication the need for switchable reflecting devices has often been expressed for wavelength routing or optical monitoring.1 The conventional method to realize these filters is to design a Bragg filter. However, these structures are obtained with very expensive technologies, as they are produced on substrates or photo-written in optical fibers. In this article, we test the cholesteric liquid crystal (CLC), which is a self-organized material owning the optical properties structurally well suited to reach these technical objectives: The CLC has almost the same properties as nematic except for a helical structure of the director. The helical axis is perpendicular to the director and this helix is characterized by the pitch. This periodic structure exhibits a periodical birefringence modulation that causes selective reflections of a circularly polarized light. The dielectric tensor is also undergoing a precession along the helical axis. Due to this structure, these liquid crystals have unique and very attractive optical properties

Labos

1 : OPT - Dépt. Optique (Institut Mines-Télécom-Télécom Bretagne-UEB)

Mots clés

Liquid crystal device, Cholesteric, Filters

Référence

11906

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