Antiresonant fibers with single- and double-ring capillaries for optofluidic applications

Abstract

In this work we discuss the effect of infiltration of different antiresonant fibers with low-refractive-index liquids, such as water and ethanol, on their optical properties. The fibers with single- and double-ring capillaries have been designed to show broad transmission bands in visible and near infrared range as it is required for optofluidics, in particular spectrophotometric applications. We show experimentally that their transmission windows shift toward shorter wavelengths and only modestly reduce their width. The transmission bands are located in the wavelength ranges of 533-670 nm and 707-925 nm, for the fibers when infiltrated with water. The two types of analyzed antiresonant fibers infiltrated with the liquids show similar light guidance properties when they are straight, but significantly lower bending loss can be achieved for the double-ring than for the single-ring antiresonant fiber. For this reason, the double-ring antiresonant fibers are more suitable as a compact solution for optofluidic applications, although transmission windows are reduced due to broader resonance peaks.

Electrochemistry in an optical fiber microcavity – optical monitoring of electrochemical processes in picoliter volumes

“…However, absorbance of any water-based solution at ca. 1400 -1600 nm is very high, and it makes standard absorbance measurements unreliable [36,37]. Taking into consideration that the interaction length of light and the solution in the microcavity does not exceed 60 µm, the application of the μIMZI may be considered as a unique technique for identification of minute changes in both RI and absorbance.…”

Spectral properties of selected antiresonant fibers coupled with standard optical fibers by means of polymer microtips

“…The unique feature of hollow core fibers are pass-band spectral characteristics and for some geometries very low transmission losses. Here in the paper, we were focused on selected group of hollow core fibers, called in literature as antiresonant optical fibers (ARFs) 5,6 . The main aim of our work was to see how the polymer microtip manufactured on the end face of standard single-mode fiber (SMF) for telecommunication wavelengths affects the transmission properties of the selected ARFs.…”