title: Low-loss liquid-core optical fiber for low-refractive-index liquids: fabrication, characterization, and application in Raman spectroscopy.
abstract: We describe a liquid-core optical fiber based on capillary tubing of Teflon AF 2400, which is a clear, amorphous fluoropolymer having a refractive index of 1.29. When filled with virtually any transparent liquid, the fiber is capable of transmitting light by total internal reflection. Loss below 3 dB/microm is demonstrated throughout much of the visible region for a 250-microm-i.d. fiber filled with water. The utility of this device in enhancing the intensity of Raman spectra of core liquids is demonstrated.
authors.forename: R
authors.initials: R
authors.lastname: Altkorn
authors.forename: I
authors.initials: I
authors.lastname: Koev
authors.forename: R P
authors.initials: RP
authors.lastname: Van Duyne
authors.forename: M
authors.initials: M
authors.lastname: Litorja