TY - GEN
T1 - Liquid-core photonic crystal fiber platform for Raman scattering measurements of microliter analyte solutions
AU - Han, Yun
AU - Oo, Maung Khaing
AU - Zhu, Yinian
AU - Sukhishvili, Svetlana
AU - Xiao, Limin
AU - Süleyman Demohan, M.
AU - Jinc, Wei
AU - Du, Henry
PY - 2007
Y1 - 2007
N2 - 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.
AB - 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.
KW - Detection
KW - Hollow-core photonic crystal fiber
KW - Index-guiding liquid-core photonic crystal fiber
KW - Raman scattering
KW - Sensing
KW - Surface-enhanced Raman scattering
UR - https://www.scopus.com/pages/publications/42449156013
UR - https://www.scopus.com/pages/publications/42449156013#tab=citedBy
U2 - 10.1117/12.769001
DO - 10.1117/12.769001
M3 - Conference contribution
AN - SCOPUS:42449156013
SN - 9780819469274
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Photonic Crystals and Photonic Crystal Fibers for Sensing Applications III
T2 - Photonic Crystals and Photonic Crystal Fibers for Sensing Applications III
Y2 - 9 September 2007 through 11 September 2007
ER -