Abstract

We describe a waveguide capillary cell based on a fused-silica tube coated externally with a thin layer of a low-refractive-index ( n = 1.31) fluoropolymer. When filled with a transparent liquid of refractive index greater than that of the fluoropolymer, the cell is capable of transmitting light through total internal reflection. Loss below 1 dB/m is demonstrated throughout much of the visible region for a 530- mu m-i.d., 660- mu m-o.d. cell filled with water.

Low-loss liquid-core optical fiber for low-refractive-index liquids: fabrication, characterization, and application in Raman spectroscopy

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Appl. Opt. 36(34) 8992-8998 (1997)

Measurement of the refractive index of microquantity liquid filled in a capillary and a capillary wall without destruction

Qiang Li and Xiaoyun Pu
Appl. Opt. 52(21) 5318-5326 (2013)

Infrared Microspectroscopy. III. A Capillary Cell for Liquids*†

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Kristopher J. Rowland, Shahraam Afshar, Alexander Stolyarov, Yoel Fink, and Tanya M. Monro
Opt. Express 20(1) 48-62 (2012)