Hollow Core Photonic Crystal Fiber Based Viscometer with Raman Spectroscopy
Peer-reviewed journal article
Laura E. Horan, Albert A. Ruth, Fatima C. Garcia Gunning
Tyndall National Institute
The velocity of a liquid flowing through a hollow core photonic crystal fiber (driven by capillary forces) is used for the determination of a liquid's viscosity, using nano-liter volumes. The simple optical technique used is based on the change in propagation characteristics of the fiber as it fills with the liquid of interest via capillary action, monitored by a laser source. Furthermore, the liquid filled hollow core photonic crystal fiber is then used as a vessel to collect Raman scattering from the sample to determine the molecular fingerprint of the liquid under study. This approach has a wide variety of indicative uses in cases where nano-liter samples are necessary. We use short lengths of hollow core photonic crystal fibers to determine the viscosity and Raman spectra of small volumes of two types of mono-saccharides diluted in a phosphate buffer solution to demonstrate the principle.
J CHEM PHYS
Journal of Chemical Physics
Bob Manning, James Dailey, Cleitus Anthony