Please use this identifier to cite or link to this item: http://repositorio.inesctec.pt/handle/123456789/6658
Title: Mach-Zehnder Based on Large Knot Fiber Resonator for Refractive Index Measurement
Authors: André Delgado Gomes
Orlando Frazão
Issue Date: 2016
Abstract: A Mach-Zehnder sensor based on a large knot fiber resonator with a diameter of a few millimeters is designed using a single long taper. The long taper of some centimeters is fabricated with a CO2 laser technique. In air, light cannot couple between adjacent sections in the knot, and no signal is observed. However, in liquid, light is less confined and there is coupling between adjacent sections of the knot, resulting in a phase difference and consequent interference. The Mach-Zehnder is formed by the two contact points in the knot. The refractive index sensing of liquid compounds is achieved by monitoring the wavelength shift of the spectra. A sensitivity of 642 ± 29 nm/refractive index unit (RIU) is achieved for refractive index sensing in the range of 1.3735-1.428 with a resolution of 0.009 RIU. For temperature sensing, a sensitivity of -42 ± 9 pm/°C is observed. A low influence of temperature in the refractive index change is observed: 6.5 × 10-5 RIU/°C. © 2016 IEEE.
URI: http://repositorio.inesctec.pt/handle/123456789/6658
http://dx.doi.org/10.1109/lpt.2016.2538963
metadata.dc.type: article
Publication
Appears in Collections:CAP - Articles in International Journals

Files in This Item:
File Description SizeFormat 
P-00K-9T6.pdf787.58 kBAdobe PDFThumbnail
View/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.