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Investigation of transmission properties of a tapered optical fibre with gold nanoparticles liquid crystal composite cladding

Joanna E. Moś Karol A. Stasiewicz Leszek R. Jaroszewicz
Opto-Electronics Review | 2022 | 30 | 4 | e143936 | DOI: 10.24425/opelre.2022.143936
Keywords tapered optical fibre liquid crystals liquid crystal composites nanoparticles optical sensor
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Abstract

The article presents a study of a hybrid structure based on the combination of a tapered optical fibre and gold nanoparticles dispersed in a liquid crystal material. Sensitivity to changes of the refractive index of the environment in which the structure is located, as well as the possibility of changing the refractive index of liquid crystals by external factors, such as temperature and electric field, were investigated. Electro- and thermally-induced changes of the refractive index of a liquid crystal through the rotation of a molecule director, which cause changes in the light propagated in a tapered optical fibre, were described. The most important issue in the article is to determine the influence of doping a liquid crystal with gold nanoparticles the concentration of which varies between 0.1 and 0.3 wt.%. The paper presents transmission measurements in a wide optical range depending on voltage, temperature, and frequency changes. Additionally, time courses of the obtained signal were measured. The study shows that the appropriate selection of nanoparticle concentration has a huge impact on the optical wave propagation. The experimental results show that the optical changes obtained for the investigated hybrid structure prefer it for use as an electro-optical switcher, filter, or sensor.
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Authors and Affiliations

Joanna E. Moś
1
ORCID: ORCID
Karol A. Stasiewicz
1
ORCID: ORCID
Leszek R. Jaroszewicz
1
ORCID: ORCID
  1. Faculty of New Technologies and Chemistry, Military University of Technology, 2 Kaliskiego St., 00-908 Warsaw, Poland

Simple method for manufacturing and optical characterization of tapered optical fibres

A. Zakrzewski A. Pięta S. Patela
Opto-Electronics Review | 2016 | vol. 24 | No 4 | 216-222
Keywords tapered optical fibre numerical analysis fabrication characterization spot diameter in the focus focal length
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Abstract

Photonic devices often use light delivered by a single-mode telecommunication fibre. However, as the diameter of the core of the optical fibre is of 10 microns, and the transverse dimensions of the photonic waveguides are usually micrometer or less, there is an issue of incompatibility. The problem may be solved by application of tapered optical fibres. For efficient light coupling, the taper should be prepared so as to create a beam of long focal length and small spot diameter in the focus. The article describes the design, fabrication and characterization of tapered optical fibres prepared with a fibre-optic fusion splicer. We modelled the tapers with FDTD method, for estimation of the influence of the tapered length and angle on the spot diameter and the focal length of an outgoing beam. We fabricated tapers from a standard single mode fibre by the Ericsson 995 PMfi- bre-optic fusion splicer. We planned the splicing technology so as to get the needed features of the beam. We planned a multistep fusion process, with optimized fusion current and fusion time. The experimental measurements of best tapered optical fibres were carried out by the knife-edge method.

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Authors and Affiliations

A. Zakrzewski
A. Pięta
S. Patela

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