Table of Contents
Conference Papers in Science
Volume 2015, Article ID 954539, 6 pages
Conference Paper

Bragg Fibers for Absorption-Based Sensing

Institute of Photonics and Electronics AS CR, v.v.i., Chaberská 57, 182 51 Prague 8, Czech Republic

Received 12 December 2014; Revised 18 March 2015; Accepted 19 March 2015

Academic Editor: Yoshihiko Takeda

This Conference Paper is based on a presentation given by Vlastimil Matějec at “Meeting on Materials and Their Applications for Devices and Sensors 2014” held from 5 November 2014 to 7 November 2014 in Mahdia, Tunisia.

Copyright © 2015 Vlastimil Matějec et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Photonic band gap Bragg fibers can be employed for delivery of high powers in medicine, lighting and heating systems, electricity production, and the development of optical sensors of physical and chemical variables. In this paper, results of testing Bragg fibers with hollow cores for pH detection based on absorbance measurements on solutions filled in the cores. Bragg fibers with claddings of three pairs of high- and low-index layers and hollow cores of 70 µm in diameter were fabricated. Photonic band gap bands of the fibers were estimated theoretically. Aqueous solutions of methyl orange (MO) and hydrochloric acid and bromothymol blue (BTB) in Sörensen buffers were filled into the cores and spectra of MO and BTB were measured for different pH. Calibration curves typical for optical pH sensors were derived from the measured spectra with a reproducibility of about 10%.