Magnetically tunable optical diffraction gratings based on a ferromagnetic liquid crystal

Author(s)
S. Gao, M. Fleisch, R. A. Rupp, L. Cmok, P. Medle-Rupnik, A. Mertelj, D. Lisjak, X. Zhang, I. Drevensek-Olenik
Abstract

Transmission optical diffraction gratings composed of periodic slices of a ferromagnetic liquid crystal and a conventional photoresist polymer are demonstrated. Dependence of diffraction efficiencies of various diffraction orders on an in-plane external magnetic field is investigated. It is shown that diffraction properties can be effectively tuned by magnetic fields as low as a few mT. The tuning mechanism is explained in the framework of a simple empirical model and also by numerical simulations based on the rigorous coupled wave analysis (RCWA). The obtained results provide a proof of principle of operation of magnetically tunable liquid crystalline diffractive optical elements applicable in contactless schemes for control of optical signals. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Organisation(s)
Physics of Functional Materials
External organisation(s)
Nankai University, Jožef Stefan Institute (IJS), University of Ljubljana
Journal
Optics Express
Volume
27
Pages
8900-8911
No. of pages
12
ISSN
1094-4087
DOI
https://doi.org/10.1364/OE.27.008900
Publication date
03-2019
Peer reviewed
Yes
Austrian Fields of Science 2012
Optics
Keywords
Portal url
https://ucris.univie.ac.at/portal/en/publications/magnetically-tunable-optical-diffraction-gratings-based-on-a-ferromagnetic-liquid-crystal(cfbbd7ca-6396-41cf-a73d-8e37dab5130b).html