Numerical analysis and experimental investigation of highly sensitive photonic crystal fiber long-period grating refractive index sensor

Zonghu He, Yinian Zhu, Jiří Kaňka, Henry Du

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

In this paper, we present the numerical analyses of modal coupling properties and resonance spectral response of longperiod gratings (LPGs) in solid-core photonic crystal fibers (PCFs) with respect to their sensitivity to refractive indices of measurands in the air channels using a full-vectoral mode solver combined with frequency-domain method. The calculated results show that the wavelength resonance of a PCF-LPG can be extremely sensitive to the refractive index change. The PCF-LPG refractive index sensors, inscribed by residual stress relaxation using a scanning CO2 laser, are also experimentally investigated in terms of resonance shift with the PCF-LPG structure filled with sodium chloride (NaCl) solutions at concentrations ranging from 0-26% (w/w). The spectral features were greatly improved by inscribing the LPG structure in PCF prefilled with water. The PCF-LPG sensors are shown to be able to detect the change of ∼10-7 refractive index unit (RIU) in the index range of 1.33 to 1.35, in a good agreement with the numerical simulation.

Original languageEnglish
Title of host publicationPhotonic Crystals and Photonic Crystal Fibers for Sensing Applications III
DOIs
StatePublished - 2007
EventPhotonic Crystals and Photonic Crystal Fibers for Sensing Applications III - Boston, MA, United States
Duration: 9 Sep 200711 Sep 2007

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume6767
ISSN (Print)0277-786X

Conference

ConferencePhotonic Crystals and Photonic Crystal Fibers for Sensing Applications III
Country/TerritoryUnited States
CityBoston, MA
Period9/09/0711/09/07

Keywords

  • Fiber Bragg gratings
  • Holey fibers
  • Long-period gratings
  • Microstructured optical fibers
  • Photonic crystal fibers
  • Refractive index sensors
  • Refractometers

Fingerprint

Dive into the research topics of 'Numerical analysis and experimental investigation of highly sensitive photonic crystal fiber long-period grating refractive index sensor'. Together they form a unique fingerprint.

Cite this