Liquid-core photonic crystal fiber platform for Raman scattering measurements of microliter analyte solutions

Yun Han, Maung Khaing Oo, Yinian Zhu, Svetlana Sukhishvili, Limin Xiao, M. Süleyman Demohan, Wei Jinc, Henry Du

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

10 Scopus citations

Abstract

We have explored the use of index-guiding liquid-core photonic crystal fiber (LC-PCF) as a platform for sensing and measurements of analyte solutions of minute volume by normal and surface-enhanced Raman scattering (SERS). The index-guiding LC-PCF was fabricated by selectively sealing via fusion splicing the cladding air channels of a hollowcore PCF (HC-PCF) while leaving the center core open at both ends of the fiber. The center core of the resultant fiber was subsequently filled with water-ethanol solution mixtures at various ethanol concentrations for normal Raman scattering measurements and with water-thiocynate solutions containing Ag nanoparticle aggregates for SERS detection of thiocynate at trace concentrations. The light-guiding nature in the solution phase inside the LC-PCF allows direct and strong light-field overlap with the solution phase over the entire length of the PCF (∼30 cm). This detection scheme also dramatically reduces the contribution of silica to Raman spectral background, compared with the solid-core counterpart, thus its potential interference in spectral analysis. These features attribute to ready normal Raman measurements of water, ethanol, and water (99 vol.%)-ethanol (1 vol.%) solutions as well as sensitive and reproducible SERS detection of ∼10 ppb thiocynate in water, all at a volume of ∼0.1 μL.

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

  • Detection
  • Hollow-core photonic crystal fiber
  • Index-guiding liquid-core photonic crystal fiber
  • Raman scattering
  • Sensing
  • Surface-enhanced Raman scattering

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